Little Boy (atomic bomb)

A post-war Little Boy model

Little Boy was the codename for the type of atomic bomb dropped on Hiroshima on August 6, 1945 by the Boeing B-29 Superfortress Enola Gay, piloted by Colonel Paul W. Tibbets, Jr., commander of the 509th Composite Group of the United States Army Air Forces. It was the first atomic bomb to be used as a weapon. The Hiroshima bombing was the second artificial nuclear explosion in history, after the Trinity test, and the first uranium-based detonation. Approximately 600 to 860 milligrams (9.3 to 13.3 grains) of matter in the bomb was converted into the energy of heat and radiation. It exploded with an energy of 16 kilotons of TNT (67 TJ).

Little Boy was developed by Lieutenant Commander Francis Birch's group of Captain William S. Parsons's Ordnance (O) Division at the Manhattan Project's Los Alamos Laboratory during World War II. Parsons flew on the Hiroshima mission as weaponeer. The Little Boy was a development of the unsuccessful Thin Man nuclear bomb. Like Thin Man, it was a gun-type fission weapon, but derived its explosive power from the nuclear fission of uranium-235. This was accomplished by shooting a hollow cylinder of uranium over another hollow enriched uranium cylinder by means of four silk bags of cordite powder. It contained 64 kg (141 lb) of enriched uranium, of which less than a kilogram underwent nuclear fission. Its components were fabricated at three different plants so that no one would have a copy of the complete design.

After the war ended, it was not expected that the inefficient Little Boy design would ever again be required, and many plans and diagrams were destroyed, but by mid-1946 the Hanford Site reactors were suffering badly from the Wigner effect, so six Little Boy assemblies were produced at Sandia Base. The Navy Bureau of Ordnance built another 25 Little Boy assemblies in 1947 for use by the nuclear-capable Lockheed P2V Neptune aircraft carrier aircraft. All the Little Boy units were withdrawn from service by the end of January 1951.

Naming

The names for all three atomic bomb design projects during World War II, Fat Man, Thin Man, and Little Boy, were created by Robert Serber, a former student of Los Alamos Laboratory director Robert Oppenheimer who worked on the Manhattan Project. According to Serber, he chose them based on their design shapes. The "Thin Man" was a long device, and the name came from the Dashiell Hammett detective novel and series of movies by the same name; the "Fat Man" was round and fat, and was named after Sydney Greenstreet's "Kasper Gutman" character in The Maltese Falcon. Little Boy would come last and was named after Elisha Cook, Jr.'s character in the same film, as referred to byHumphrey Bogart.

Development

Because uranium-235 was known to be fissionable, it was the first approach to bomb development pursued. The vast majority of the work came in the form of the isotope enrichment of the uranium necessary for the weapon, since uranium-235 makes up only 1 part in 140 of natural uranium. Enrichment was performed at Oak Ridge, Tennessee, where the electromagnetic separation plant, known as Y-12, became fully operational in March 1944. The first shipments of highly enriched uranium were sent to the Los Alamos Laboratory in June 1944

Most of the uranium necessary for the production of the bomb came from the Shinkolobwe mine and was made available thanks to the foresight of the CEO of the High Katanga Mining Union, Edgar Sengier, who had 1,000 long tons (1,000 t) of uranium ore transported to a New York warehouse in 1939. At least part of the 1,200 long tons (1,200 t) of uranium ore and uranium oxide captured by the Alsos Mission in 1944 and 1945 was used in the bomb.

As part of Project Alberta, Commander A. Francis Birch (left) assembles the bomb while physicist Norman Ramsey watches. This is one of the rare photos where the inside of the bomb can be seen.

The design was a development of the original Thin Man, a gun-type fission weapon 17 feet (5.2 m) long. Like the Fat Man, it was designed for plutonium but would have worked with enriched uranium as well. The Thin Man design was abandoned after experiments by Emilio G. Segrè and his P-5 Group at Los Alamos on the newly reactor-produced plutonium from Oak Ridge and the Hanford site showed that it contained impurities in the form of the isotope plutonium-240. This has a far higher spontaneous fission rate and radioactivity than thecyclotron-produced plutonium on which the original measurements had been made, and its inclusion in reactor-bred plutonium appeared unavoidable. This meant that the background fission rate of the plutonium was so high that it would be highly likely the plutonium would predetonate and blow itself apart in the initial forming of a critical mass.

In July 1944, almost all research at Los Alamos was reorganised redirected to the implosion-type plutonium weapon. Overall, responsibility for the uranium gun-type weapon was assigned to Captain William S. Parsons's Ordnance (O) Division. All the design, development and technical work at Los Alamos was consolidated under Lieutenant Commander Francis Birch's group.

In contrast to the plutonium implosion-type nuclear weapon, the uranium gun-type weapon was straightforward if not trivial to design. The concept was pursued so that in case of a failure to develop a plutonium bomb, it would still be possible to use the gun principle. The gun-type design henceforth had to work with enriched uranium only, and this allowed the Thin Man design to be greatly simplified. A high velocity gun was no longer required, and a simpler weapon could be substituted. This greatly shortened the weapon, so that it would fit into a B-29 bomb bay.

The design specifications were completed in February 1945, and contracts were let to build the components. Three different plants were used so that no one would have a copy of the complete design. The gun and breech were made by the Naval Gun Factory in Washington, D.C.; the target case and some other components were by the Naval Ordnance Plant in Center Line, Michigan; and the tail fairing and mounting brackets by the Expert Tool and Die Company in Detroit, Michigan. The bomb, except for the uranium payload, was ready at the beginning of May 1945. The uranium 235 projectile was completed on June 15, and the target on July 24. The target and bomb pre-assemblies (partly assembled bombs without the fissile components) left Hunters Point Naval Shipyard, California, on July 16 aboard the cruiser USS Indianapolis, arriving July 26. The target inserts followed by air on July 30.

While testing of the components was conducted, no full test of a gun-type nuclear weapon occurred before the Little Boy was dropped over Hiroshima. The only test explosionof a nuclear weapon concept had been of an implosion-type device employing plutonium as its fissionable material, and took place on July 16, 1945 at the Trinity nuclear test. There were several reasons for not testing a Little Boy type of device. Primarily, there was little uranium-235 as compared with the relatively large amount of plutonium which, it was expected, could be produced by the Hanford Site reactors. Additionally, the weapon design was simple enough that it was only deemed necessary to do laboratory tests with the gun-type assembly. Unlike the implosion design, which required sophisticated coordination of shaped explosive charges, the gun-type design was considered almost certain to work.

The danger of accidental detonation made safety a concern. Little Boy incorporated basic safety mechanisms, but an accidental detonation could still occur. Tests were conducted to see if a crash could drive the hollow "bullet" onto the "target" cylinder resulting in a massive release of radiation, or possibly nuclear detonation. These showed that this required an impact of 500 times that of gravity, which made it highly unlikely. There was still concern that a crash and a fire could trigger the explosives. If immersed in water, the uranium halves were subject to a neutron moderator effect. While this would not have caused an explosion, it could have created widespread radioactive contamination. For this reason, pilots were advised to crash on land rather than at sea.

Design

The "gun" assembly method. When the hollow uranium projectile was driven onto the target cylinder, a nuclear explosion resulted.

The Little Boy was 120 inches (300 cm) in length, 28 inches (71 cm) in diameter and weighed approximately 9,700 pounds (4,400 kg).The design used the gun method to explosively force a hollow sub-critical mass of uranium-235 and a solid target cylinder together into a super-critical mass, initiating a nuclear chain reaction. This was accomplished by shooting one piece of the uranium onto the other by means of four cylindrical silk bags of slotted-tube cordite powder. The bomb contained 64 kg (141 lb) of enriched uranium. Most was enriched to 89% but some was only 50% uranium-235, for an average enrichment of 80%. of which less than a kilogram underwentnuclear fission, and of this mass only 0.6 g (0.021 oz) was transformed into a different type of energy, initially kinetic energy, then heat and radiation.

Assembly details

Inside the weapon, the uranium-235 material was divided into two parts, following the gun principle: the "projectile" and the "target". The projectile was a hollow cylinder with 60% of the total mass (38.5 kg (85 lb)). It consisted of a stack of 9 uranium rings, each 6.25-inch (159 mm) in diameter with a 4-inch (100 mm) bore in the center, and a total length of 7 inches (180 mm), pressed together into the front end of a thin-walled projectile 413 millimetres (16.25 in) long. Filling in the remainder of the space behind these rings in the projectile was a tungsten carbide disc with a steel back. At ignition, the projectile slug was pushed 42 inches (1,100 mm) along the 72-inch (1,800 mm) long, 6.5-inch (170 mm) smooth-bore gun barrel. The slug "insert" was a 4 inches (100 mm) cylinder, 7 inches (180 mm) in length with a 25 millimetres (1 in) axial hole. The slug comprised 40% of the total fissile mass (25.6 kg (56 lb)). The insert was a stack of 6 washer-like uranium discs somewhat thicker than the projectile rings that were slid over a 1 inch (25 mm) rod. This rod then extended forward through the tungsten carbide tamper plug, impact-absorbing anvil, and nose plug backstop eventually protruding out the front of the bomb casing. This entire target assembly was secured at both ends with locknuts.

When the hollow-front projectile reached the target and slid over the target insert, the assembled super-critical mass of uranium would be completely surrounded by a tamper and neutron reflector of tungsten carbide and steel, both materials having a combined mass of 2,300 kg (5,100 lb). Neutron initiators at the base of the projectile were activated by the impact.

Counter-intuitive design

For the first fifty years after 1945, every published description and drawing of the Little Boy mechanism assumed that a small, solid projectile was fired into the center of a larger target. However, critical mass considerations dictated that in Little Boy the larger, hollow piece would be the projectile. The assembled fissile core had more than two critical masses of uranium 235. This required one of the two pieces to have more than one critical mass. A hole in the center of the larger mass dispersed the mass and increased the surface area, allowing more fission neutrons to escape, thus preventing a premature chain reaction.

It was also important for the larger piece to have minimal contact with the neutron-reflecting tungsten carbide tamper until detonation, thus only the projectile's back end was in contact with tungsten carbide. The rest of the tungsten carbide surrounded the sub-critical mass target cylinder (called the "insert" by the designers) with air space between it and the insert. This arrangement packs the maximum amount of fissile material into a gun-assembly design.

Fuse system

Arming plugs for a Little Boy type atomic bomb on display at the National Air and Space Museum's Steven F. Udvar-Hazy Center.

The bomb employed a fusing system that was designed to detonate the bomb at the most destructive altitude. Calculations showed that for the largest destructive effect, the bomb should explode at an altitude of 580 metres (1,900 ft). The resultant fuse design was a three-stage interlock system:

• A timer ensured that the bomb would not explode until at least fifteen seconds after release, one-quarter of the predicted fall time, to ensure safety of the aircraft. The timer was activated when the electrical pull-out plugs connecting it to the airplane pulled loose as the bomb fell, switching it to internal (24V battery) power and starting the timer. At the end of the 15 seconds the radar altimeters were powered up and responsibility was passed to the barometric stage.
• The purpose of the barometric stage was to delay activating the radar altimeter firing command circuit until near detonation altitude. A thin metallic membrane enclosing a vacuum chamber (a similar design is still used today in old-fashioned wall barometers) was gradually deformed as ambient air pressure increased during descent. The barometric fuse was not considered accurate enough to detonate the bomb at the precise ignition height, because air pressure varies with local conditions. When the bomb reached the design height for this stage (reportedly 2,000 metres, 6,600 ft) the membrane closed a circuit, activating the radar altimeters. The barometric stage was added because of a worry that external radar signals might detonate the bomb too early.
• Two or more redundant radar altimeters were used to reliably detect final altitude. When the altimeters sensed the correct height, the firing switch closed, igniting the three BuOrd Mk15, Mod 1 Navy gun primers in the breech plug, which set off the charge consisting of four silk powder bags each containing two pounds of WM slotted-tube cordite. This launched the uranium projectile towards the opposite end of the gun barrel at an eventual muzzle velocity of 300 metres per second (980 ft/s). Approximately 10 milliseconds later the chain reaction occurred, lasting less than 1 microsecond. The radar altimeters used were modified U.S. Army Air Corps APS-13 fighter tail warning radars, nicknamed "Archie", to warn a pilot of another plane approaching from behind.

Rehearsals

Little Boy in the bomb pit on Tinianisland, before being loaded into Enola Gay's bomb bay. A section of the bomb bay door is visible on the top right.

The Little Boy pre-assemblies were designated L-1, L-2, L-3, L-4, L-5, L-6, L-7 and L-11. L-1, L-2, L-5 and L-6 were expended in test drops. The first drop test was conducted with L-1 on July 23, 1945. It was dropped over the sea near Tinian in order to test the radar altimeter by the B-29 later known as Big Stink, piloted by Colonel Paul W. Tibbets, the commander of the 509th Composite Group. Two more drop tests over the sea were made on July 24 and 25, using the L-2 and L-5 units in order to test all components. Tibbets was the pilot for both missions, but this time the bomber used was the one subsequently known as Jabit. L-6 was used a dress rehearsal on July 29. The B-29 Next Objective, piloted by Major Charles W. Sweeney, flew to Iwo Jima, where emergency procedures for loading the bomb onto a standby aircraft were practiced. This rehearsal was repeated on July 31, but this time L-6 was reloaded onto a different B-29, Enola Gay, piloted by Tibbets, and the bomb was test dropped near Tinian. L-11 was the assembly used for the Hiroshima bomb.

The bombing of Hiroshima

The mushroom cloud over Hiroshima after the dropping of Little Boy

Parsons, the Enola Gay's weaponeer, was concerned about the possibility of an accidental detonation if the plane crashed in takeoff, so he decided not to load the four cordite powder bags into the gun breech until the aircraft was in flight. Parsons and his assistant, Second Lieutenant Morris R. Jeppson, made their way into the bomb bay along the narrow catwalk on the port side. Jeppson held a flashlight while Parsons disconnected the primer wires, removed the breech plug, inserted the powder bags, replaced the breech plug, and reconnected the wires. Before climbing to altitude on approach to the target, Jeppson switched the three safety plugs between the electrical connectors of the internal battery and the firing mechanism from green to red. The bomb was then fully armed. Jeppson monitored the bomb's circuits.

The bomb was dropped at approximately 08:15  (JST) August 6, 1945. After falling for 44.4 seconds, the time and barometric triggers started the firing mechanism. The detonation happened at an altitude of 1,968 ± 50 feet (600 ± 15 m). It was less powerful than the Fat Man, which was dropped on Nagasaki, but the damage and the number of victims at Hiroshima were much higher, as Hiroshima was on flat terrain, while the hypocenter of Nagasaki lay in a small valley. According to figures published in 1945, 66,000 people were killed as a direct result of the Hiroshima blast, and 69,000 were injured to varying degrees.

The exact measurement of the yield was problematic, since the weapon had never been tested. President Harry S Truman officially announced that the yield was 20 kilotons of TNT (84 TJ). This was based on Parsons's visual assessment that the blast was greater than what he had seen at the Trinity nuclear test. Since that had been estimated at 18 kilotons of TNT (75 TJ), speech writers rounded up to 20 kilotons. Further discussion was then suppressed, for fear of lessening the impact of the bomb on the Japanese. Data had been collected by Luis Alvarez, Harold Agnew and Lawrence H. Johnston on the instrument plane The Great Artiste but this was not used to calculate the yield at the time.

After hostilities ended, a survey team from the Manhattan Project that included William Penney, Robert Serber and George T. Reynoldswas sent to Hiroshima to evaluate the effects of the blast. From evaluating the effects on objects and structures, Penney concluded that the yield was 12 ± 1 kilotons. Later calculations based on charring pointed to a yield of 13 to 14 kilotons. In 1953, Frederick Reines calculated that the yield as 13 kilotons.This figure became the official yield.

In 1962, scientists at Los Alamos created a mockup of Little Boy known as "Ichiban" in order to answer some of the unanswered questions, but it failed to clear up all the issues. In 1982, Los Alamos created a replica Little Boy from the original drawings and specifications. This was then tested with enriched uranium but in a safe configuration that would not cause a nuclear explosion. A hydraulic lift was used to move the projectile, and experiments were run to assess neutron emission. Based on this and the data from The Great Artiste, the yield was estimated at 16.6 ± 0.3 kilotons. After considering many estimation methods, a 1985 report concluded that the yield was 15 kilotons ± 20%. 

When 1 pound (0.45 kg) of uranium-235 undergoes complete fission, the yield is 8 kilotons. The 16 kiloton yield of the Little Boy bomb was therefore produced by the fission no more than 2 pounds (0.91 kg) of uranium-235, out of the 141 pounds (64 kg) in the pit. The remaining 139 pounds (63 kg), 98.5% of the total, contributed nothing to the energy yield.

Physical effects of the bomb

 

The General Effects of the Bomb on Hiroshima. Focuses on damage to the munitions manufacturing industry of the city.

After being selected in April 1945, Hiroshima was spared conventional bombing to serve as a pristine target, where the effects of a nuclear bomb on an undamaged city could be observed. While damage could be studied later, the energy yield of the untested Little Boy design could be determined only at the moment of detonation, using instruments dropped by parachute from a plane flying in formation with the one that dropped the bomb. Radio-transmitted data from these instruments indicated a yield of about 15 kilotons.

Comparing this yield to the observed damage produced a rule of thumb called the 5 psi lethal area rule. The number of immediate fatalities will approximately equal the number of people inside the area where the shock wave carries an over pressure of 5 psi or greater. At Hiroshima, that area was 3.5 kilometres (2.2 mi) in diameter.

The damage came from three main effects: blast, fire, and radiation.

Blast

The blast from a nuclear bomb is the result of X-ray-heated air (the fireball) sending a shock/pressure wave in all directions at a velocity greater than the speed of sound (aka, the "Mach-Stem"), analogous to thunder generated by lightning. Knowledge about urban blast destruction is based largely on studies of Little Boy at Hiroshima. Nagasaki buildings suffered similar damage at similar distances, but the Nagasaki bomb detonated 3.2 kilometres (2.0 mi) from the city center over hilly terrain that was partially bare of buildings.

Frame house in 1953 nuclear test, 5psi overpressure

In Hiroshima almost everything within 1.6 kilometres (1.0 mi) of the point directly under the explosion was completely destroyed, except for about 50 heavily reinforced, earthquake-resistant concrete buildings, only the shells of which remained standing. Most were completely gutted, with their windows, doors, sashes, and frames ripped out. The perimeter of severe blast damage approximately followed the 5 psi contour at 1.8 kilometres (1.1 mi).

Later test explosions of nuclear weapons with houses and other test structures nearby confirmed the 5 psi overpressure threshold. Ordinary urban buildings experiencing it will be crushed, toppled, or gutted by the force of air pressure. The picture at right shows the effects of a nuclear-bomb-generated 5 psi pressure wave on a test structure in Nevada in 1953.

A major effect of this kind of structural damage was that it created fuel for fires that were started simultaneously throughout the severe destruction region.

Fire

The first effect of the explosion was blinding light, accompanied by radiant heat from the fireball. The Hiroshima fireball was 370 metres (1,200 ft) in diameter, with a surface temperature of 6,000 °C (10,830 °F). Near ground zero, everything flammable burst into flame. One famous, anonymous Hiroshima victim, sitting on stone steps 260 metres (850 ft) from the hypocenter, left only a shadow, having absorbed the fireball heat that permanently bleached the surrounding stone. Simultaneous fires were started throughout the blast-damaged area by fireball heat and by overturned stoves and furnaces, electrical shorts, etc. Twenty minutes after the detonation, these fires had merged into a firestorm, pulling in surface air from all directions to feed an inferno which consumed everything flammable.

Hiroshima blast and fire damage, U.S. Strategic Bombing Survey map

The Hiroshima firestorm was roughly 3.2 kilometres (2.0 mi) in diameter, corresponding closely to the severe blast damage zone. (See the USSBS map, right.) Blast-damaged buildings provided fuel for the fire. Structural lumber and furniture were splintered and scattered about. Debris-choked roads obstructed fire fighters. Broken gas pipes fueled the fire, and broken water pipes rendered hydrants useless. At Nagasaki, the fires failed to merge into a single firestorm, and the fire-damaged area was only one fourth as great as at Hiroshima, due in part to a southwest wind that pushed the fires away from the city.

As the map shows, the Hiroshima firestorm jumped natural firebreaks (river channels), as well as prepared firebreaks. The spread of fire stopped only when it reached the edge of the blast-damaged area, encountering less available fuel.

Accurate casualty figures are impossible to determine, because many victims were cremated by the firestorm, along with all record of their existence. The Manhattan Project report on Hiroshima estimated that 60% of immediate deaths were caused by fire, but with the caveat that "many persons near the center of explosion suffered fatal injuries from more than one of the bomb effects." In particular, many fire victims also received lethal doses of nuclear radiation.

Radiation

Local fallout is dust and ash from a bomb crater, contaminated with radioactive fission products. It falls to earth downwind of the crater and can produce, with radiation alone, a lethal area much larger than that from blast and fire. With an air burst, the fission products rise into the stratosphere, where they dissipate and become part of the global environment. Because Little Boy was an air burst 580 metres (1,900 ft) above the ground, there was no bomb crater and no local radioactive fallout.

However, a burst of intense neutron and gamma radiation came directly from the fireball. Its lethal radius was 1.3 kilometres (0.8 mi), covering about half of the firestorm area. An estimated 30% of immediate fatalities were people who received lethal doses of this direct radiation, but died in the firestorm before their radiation injuries would have become apparent. Over 6,000 people survived the blast and fire, but died of radiation injuries. Among injured survivors, 30% had radiation injuries from which they recovered, but with a lifelong increase in cancer risk.To date, no radiation-related evidence of heritable diseases has been observed among the survivors' children.

Conventional weapon equivalent

Although Little Boy exploded with the energy equivalent of 16,000 tons of TNT, the Strategic Bombing Survey estimated that the same blast and fire effect could have been caused by only 2,100 tons of conventional bombs: "220 B-29s carrying 1,200 tons of incendiary bombs, 400 tons of high-explosive bombs, and 500 tons of anti-personnel fragmentation bombs." Since the target was spread across a two-dimensional plane, the vertical component of a single spherical nuclear explosion was largely wasted. A cluster bomb pattern of smaller explosions would have been a more energy-efficient match to the target.

Post-war

When the war ended, it was not expected that the inefficient Little Boy design would ever again be required, and many plans and diagrams were destroyed. However, by mid-1946 the Hanford Site reactors were suffering badly from the Wigner effect. Faced with the prospect of no more plutonium for new cores and no more polonium for the initiators for the cores that had already been produced, Groves ordered that a number of Little Boys be prepared as an interim measure until a cure could be found. No Little Boy assemblies were available, and no comprehensive set of diagrams of the Little Boy could be found, although there were drawings of the various components, and stocks of spare parts.

At Sandia Base, three Army officers, Captains Albert Bethel, Richard Meyer and Bobbie Griffin attempted to re-create the Little Boy. They were supervised by Harlow W. Russ, an expert on Little Boy who served with Project Alberta on Tinian, and was now leader of the Z-11 Group of the Los Alamos Laboratory's Z Division at Sandia. Gradually, they managed to locate the correct drawings and parts, and figured out how they went together. Eventually, they built six Little Boy assemblies. While the casings, barrels and components were tested, no enriched uranium was supplied for the bombs. By early 1947, the problems caused by the Wigner effect was on its way to solution, and the three officers were reassigned.

The Navy Bureau of Ordnance built 25 Little Boy assemblies in 1947 for use by the nuclear-capable Lockheed P2V Neptune aircraft carrier aircraft. Components were produced by the Naval Ordnance Plants in Pocatello, Idaho, and Louisville, Kentucky. Enough fissionable material was available by 1948 to build ten projectiles and targets, although there were only enough initiators for six. All the Little Boy units were withdrawn from service by the end of January 1951.

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Vasco da Gama

D. Vasco da Gama (c. 1460-1469? – 23 December 1524), 1st Count of Vidigueira, was a Portuguese explorer, one of the most successful in the Age of Discovery and the commander of the first ships to sail directly fromEurope to India.

He is one of the most famous and celebrated explorers from the Discovery Ages, being the first European to reach India by sea. This discovery was very significant and paved the way for the Portuguese to establish a long lasting colonial empire in Asia. The route meant that the Portuguese would not need to cross the highly disputed Mediterranean nor the dangerous Arabia, and that the whole voyage would be made by sea.

After decades of sailors trying to reach India with thousands of lives and dozens of vessels lost in shipwrecks and attacks, Gama landed in Calicut on 20 May 1498. Reaching the legendary Indian spice routes unopposed helped the Portuguese Empire improve its economy that, until Gama, was mainly based on trades along Northern and coastal West Africa. These spices were mostly pepper and cinnamon at first, but soon included other products, all new to Europe which led to a commercial monopoly for several decades.

Gama headed two of the armadas destined for India, the first and the fourth, the biggest armada, only four years after his arrival from the first one. For his contributions he was named in 1524 as the Governor of India, under the title of Viceroy, and given the newly created County of Vidigueira in 1519.

Numerous homages have been made worldwide in Vasco da Gama's honour for his explorations and accomplishments. He remains as a leading exploration figure to this day. The Portuguese national epic, Os Lusíadas, was written to celebrate Vasco da Gama. His first trip to India is widely considered a pinnacle of world history as it marked the beginning of the first wave of global multiculturalism.

Early life

Vasco Da Gama

Statue of Vasco da Gama at his birthplace, Sines, Portugal

Vasco da Gama was born 1460 or 1469 in Sines, on the southwest coast of Portugal, probably in a house near the church of Nossa Senhora das Salas. Sines, one of the few seaports on the Alentejo coast, consisted of little more than a cluster of whitewashed, red-tiled cottages, tenanted chiefly by fisherfolk.

Vasco da Gama's father was Estêvão da Gama, who had served in the 1460s as a knight of the household of Infante Ferdinand, Duke of Viseu and went on to rise in the ranks of the military Order of Santiago. Estêvão da Gama was appointed alcaide-mór (civil governor) of Sines in the 1460s, a post he held until 1478, and continued as a receiver of taxes and holder of the Order's commendas in the region.

Estêvão da Gama married Isabel Sodré, a daughter of João Sodré (also known as João de Resende), scion of a well-connected family of English origin. Her father and her brothers,Vicente Sodré and Brás Sodré, had links to the household of Infante Diogo, Duke of Viseuand were prominent figures in the military Order of Christ.

Vasco da Gama was the third of five sons of Estêvão da Gama and Isabel Sodré - in (probable) order of age: Paulo da Gama, João Sodré, Vasco da Gama, Pedro da Gama and Aires da Gama. Vasco also had one known sister, Teresa da Gama (who married Lopo Mendes de Vasconcelos).

Little is known of Vasco da Gama's early life. The Portuguese historian Teixeira de Aragão suggests that Vasco da Gama studied at the inland town of Évora, which is where he may have learned mathematics and navigation and it has even been claimed (although dubiously) that he studied under the astronomer Abraham Zacuto.

Around 1480, Vasco da Gama followed his father (rather than the Sodrés) and joined the Order of Santiago. The master of Santiago was Prince John, who would ascend to the throne in 1481 as King John II of Portugal. John II doted on the Order, and the Gamas' prospects rose accordingly.

In 1492, John II dispatched Vasco da Gama on a mission to the port of Setúbal and to the Algarve to seize French ships in retaliation for peacetime depredations against Portuguese shipping - a task that da Gama rapidly and effectively performed.

First voyage

On 8 July 1497 Vasco da Gama led a fleet of four ships with a crew of 170 men from Lisbon. The distance traveled in the journey around Africa to India and back was greater than around the equator. The navigators included Portugal's most experienced, Pero de Alenquer, Pedro Escobar, João de Coimbra, and Afonso Gonçalves. It is not known for certain how many people were in each ship's crew but approximately 55 returned, and two ships were lost. Two of the vessels were as naus or newly built for the voyage, possibly a caraveland a supply boat. The four ships were:

The route followed in Vasco da Gama's first voyage (1497–1499)

• The São Gabriel, commanded by Vasco da Gama; a carrack of 178 tons, length 27 m, width 8.5 m, draft 2.3 m, sails of 372 m²
• The São Rafael, whose commander was his brother Paulo da Gama; similar dimensions to the São Gabriel
• The caravel Berrio, slightly smaller than the former two (later renamed São Miguel), commanded by Nicolau Coelho
• A storage ship of unknown name, commanded by Gonçalo Nunes, later lost near the Bay of São Brás, along the east coast of Africa.

Journey to the Cape

The expedition set sail from Lisbon on 8 July 1497. It followed the route pioneered by earlier explorers along the coast of Africa via Tenerife and theCape Verde Islands. After reaching the coast of present day Sierra Leone, da Gama took a course south into the open ocean, crossing the Equator and seeking the South Atlantic westerlies that Bartolomeu Dias had discovered in 1487. This course proved successful and on 4 November 1497, the expedition made landfall on the African coast. For over three months the ships had sailed more than 6,000 miles of open ocean, by far the longest journey out of sight of land made by that time.

Monument to the Cross of Vasco da Gama at the Cape of Good Hope, South Africa

By 16 December, the fleet had passed the Great Fish River (Eastern Cape, South Africa) - where Dias had turned back - and sailed into waters previously unknown to Europeans. With Christmas pending, da Gama and his crew gave the coast they were passing the name Natal, which carried the connotation of "birth of Christ" in Portuguese.

Arab-controlled territory on the East African coast was an integral part of the network of trade in the Indian Ocean. Fearing the local population would be hostile to Christians, da Gama impersonated a Muslim and gained audience with the Sultan of Mozambique. With the paltry trade goods he had to offer, da Gama was unable to provide a suitable gift to the ruler and soon the local populace became suspicious of da Gama and his men. Forced by a hostile crowd to flee Mozambique, da Gama departed the harbor, firing his cannons into the city in retaliation.

Mombasa

In the vicinity of modern Kenya, the expedition resorted to piracy, looting Arab merchant ships - generally unarmed trading vessels without heavy cannons. The Portuguese became the first known Europeans to visit the port of Mombasa but were met with hostility and soon departed.

Mogadishu

In the Middle Ages, Mogadishu along with other coastal Somali cities in the south east of theHorn of Africa came under the Ajuuraan Empire's sphere of influence and experienced another Golden Age. When Vasco da Gama passed by Mogadishu, he noted that it was a large city with houses of four or five stores high and big palaces in its center and many mosques with cylindrical minarets.

Malindi

In February 1498, Vasco da Gama continued north, landing at the friendlier port of Malindi - whose leaders were then in conflict with those of Mombasa - and there the expedition first noted evidence of Indian traders. Da Gama and his crew contracted the services of a pilot whose knowledge of the monsoon winds allowed him to bring the expedition the rest of the way to Calicut, located on the southwest coast of India. Sources differ over the identity of the pilot, calling him variously a Christian, a Muslim, and a Gujarati. One traditional story describes the pilot as the famous Arab navigator Ibn Majid, but other contemporaneous accounts place Majid elsewhere, and he could not have been near the vicinity at the time. Also, none of the Portuguese historians of the time mention Ibn Majid.

Calicut, India

A steel engraving from the 1850s, with modern hand coloring—it shows the meeting of Vascoda Gama with Zamorin

Vasco da Gama lands at Calicut, 20 May 1498.

Landmark in Kappad, Near Calicut

Seashore of Kappad

The fleet arrived in Kappadu near Calicut, India on 20 May 1498. The King of Calicut, the Samudiri (Zamorin), who was at that time staying in his second capital at Ponnani, returned to Calicut on hearing the news of the foreign fleets's arrival. The navigator was received with traditional hospitality, including a grand procession of at least 3,000 armed Nairs, but an interview with the Zamorin failed to produce any concrete results. The presents that da Gama sent to the Zamorin as gifts from Dom Manuel—four cloaks of scarlet cloth, six hats, four branches of corals, twelvealmasares, a box with seven brass vessels, a chest of sugar, two barrels of oil and a cask of honey—were trivial, and failed to impress. While Zamorin's officials wondered at why there was no gold or silver, the Muslim merchants who considered da Gama their rival suggested that the latter was only an ordinary pirate and not a royal ambassador. Vasco da Gama's request for permission to leave a factor behind him in charge of the merchandise he could not sell was turned down by the King, who insisted that da Gama pay customs duty—preferably in gold—like any other trader, which strained the relation between the two. Annoyed by this, da Gama carried a few Nairs and sixteen fishermen (mukkuva) off with him by force. Nevertheless, da Gama's expedition was successful beyond all reasonable expectation, bringing in cargo that was worth sixty times the cost of the expedition.

Return

Vasco da Gama left Calicut on 29 August 1498. Eager to set sail for home, he ignored the local knowledge of monsoon wind patterns which were still blowing onshore. The fleet initially inched north along the Indian coast, and then anchored in at Anjediva island for a spell. They finally struck out for their Indian Ocean crossing on 3 October 1498. But with the winter monsoon yet to set in, it was a harrowing journey. On the outgoing journey, sailing with the summer monsoon wind, it had taken Gama's fleet only 23 days to cross the Indian Ocean; now, on the return trip, sailing against the wind, it took 132 days. Vasco da Gama's fleet finally arrived in Malindi on 7 January 1499, in a terrible shape - approximately half of the crew had died during the crossing, and many of the rest were afflicted with scurvy. Not having enough crewmen left standing to manage three ships, Vasco da Gama ordered the São Rafael scuttled off the East African coast, and the crew re-distributed to the remaining two ships, the São Gabriel and the Berrio. Thereafter, the sailing was smoother. By early March, they had arrived in Mossel Bay, and crossed the Cape of Good Hope in the opposite direction on 20 March. They reached the west African coast by 25 April.

Pillar of Vasco da Gama in Malindi, erected on the return journey.

The diary record of the expedition ends abruptly here. Reconstructing from other sources, it seems they continued to Cape Verde, where Nicolau Coelho's Berrio separated from Vasco da Gama's São Gabriel, and sailed on by itself.The Berrio arrived in Lisbon on 10 July 1499 andNicolau Coelho personally delivered the news to King Manuel I and the royal court, then assembled in Sintra. In the meantime, back in Cape Verde, Vasco's brother, Paulo da Gama had fallen grievously ill. Gama elected to stay by his side onSantiago island, and handed the São Gabriel over to his clerk, João de Sá, to take home. The S. Gabriel under Sá arrived in Lisbon sometime in late July or early August. Vasco da Gama and his sickly brother eventually hitched a ride with a Guinea caravel returning to Portugal, but Paulo da Gama died en route. Vasco da Gama got off at the Azores to bury his brother at the monastery of São Francisco in Angra do Heroismo, and lingered there for a little while in mourning. Vasco da Gama eventually took passage on an Azorean caravel and finally arrived in Lisbon on 29 August 1499 (according to Barros)., or early September (8th or 18th, according to other sources). Despite his melancholic mood, Vasco da Gama was given a hero's welcome, and showered with honors, including a triumphal procession and public festivities. King Manuel wrote two letters in which he described Vasco da Gama's first voyage, in July and August 1499, soon after the return of the ships. Girolamo Sernigi also wrote three letters describing the first voyage of Vasco da Gama soon after the return of the expedition.

Outward and Return voyages of the Portuguese India Run (Carreira da Índia). The Outward route of the South Atlantic westerlies that Bartolomeu Dias discovered in 1487, followed and explored by Vasco da Gama in the open ocean, would be developed in subsequent years.

The expedition had exacted a large cost - one ship and over half the men had been lost. It had also failed in its principal mission of securing a commercial treaty with Calicut. Nonetheless, the spices brought back on the remaining two ships were sold at an enormous profit to the crown. Vasco da Gama was justly celebrated for opening a direct sea route to Asia. His path would be followed up thereafter by yearly Portuguese India Armadas.

The spice trade would prove to be a major asset to the Portuguese royal treasury, and other consequences soon followed. For example, Gama's voyage had made it clear that the east coast of Africa, the Contra Costa, was essential to Portuguese interests; its ports provided fresh water, provisions, timber, and harbors for repairs, and served as a refuge where ships could wait out unfavorable weather. One significant result was the colonization of Mozambique by the Portuguese Crown.

Rewards

An aged Vasco da Gama, as Viceroy of India and Count of Vidigueira (from Livro de Lisuarte de Abreu)

In December 1499, Vasco da Gama was rewarded by King Manuel I of Portugal with the town ofSines as a hereditary fief (the very town which his father, Estêvão, had once held as acommenda). This turned out to be a rather complicated affair, for Sines still belonged to the Order of Santiago. On the face of it, it should not have been a problem for Jorge de Lencastre, the master of the Order, to endorse the reward - after all, Gama was a Santiago knight, one of their own, and a close associate of Lencastre himself. But the fact that Sines was awarded by the king's hand, provoked Lencastre to refuse out of principle - lest it encourage the king to make other donations of the Order's properties. Gama would spend the next few years attempting to take hold of Sines - an effort which would estrange him from Lencastre and eventually prompt Gama to abandon his beloved Order of Santiago, switching over to the rival Order of Christ in 1507.
In the meantime, Gama made do with a substantial hereditary royal pension of 300,000 reis, and the award of the noble title of Dom (lord) in perpetuity for himself, his siblings and their descendants. In early 1502 (some say as early as 1500), Vasco da Gama was awarded the title of Almirante dos mares de Arabia, Persia, India e de todo o Oriente ("Admiral of the Seas of Arabia, Persia, India and all the Orient") - an overwrought title reminiscent of the ornate Castilian title borne by Christopher Columbus. (Evidently, Manuel must have reckoned that if Castile had an 'Admiral of the Seas' running around, then surely Portugal should have one too.)[21] Another royal letter, dated October 1501, gave Vasco da Gama the personal right to intervene and exercise a determining role on any future India-bound fleet.
Around 1501, Vasco da Gama married Catarina de Ataíde, daughter of Álvaro de Ataíde, the alcaide-mór of Alvor (Algarve), and a prominent nobleman connected by kinship with the powerful Almeida family (Catarina was a first cousin of D. Francisco de Almeida).


Second voyage

Malabar Coast of India, c.1500, showing the path of Vasco da Gama's 4th India Armada in 1502.

The follow-up expedition, the Second India Armada launched in 1500, was placed under the command Pedro Álvares Cabral, with the mission of making a treaty with the Zamorin ofCalicut and setting up a Portuguese factory in the city. However, Cabral entered into a conflict with the local Arab merchant guilds, with the result that the Portuguese factory was overrun in a riot and up to 70 Portuguese killed. Cabral blamed the Zamorin for the incident and bombarded the city. Thus war broke out between Portugal and Calicut.
Vasco da Gama invoked his royal letter to take command of the 4th India Armada, scheduled to set out in 1502, with the explicit aim of taking revenge upon the Zamorin and force him to submit to Portuguese terms. The heavily armed fleet of fifteen ships and eight hundred men left Lisbon on 12 February 1502. One of the squadrons was led by his cousin, Estêvão da Gama (the son of Aires da Gama), and two of his maternal uncles, Vicente Sodré and Brás Sodré, were pre-designated to command an Indian Ocean naval patrol.

Along the way, on the outgoing voyage, Gama's fleet opened contact with the East African gold port of Sofala, and reduced the sultanate of Kilwa to tribute, extracting a substantial sum of gold. On reaching India in October 1502, da Gama started capturing any Arab vessel he came across in Indian waters, most notoriously the Miri, a pilgrim ship from Mecca, whose passengers he had massacred in open water. He then appeared before Calicut, demanding redress for the treatment meted out to Cabral. While the Zamorin was willing to sign a new treaty, Gama made a preposterous call to the Hindu king to expel all Muslims from Calicut before beginning negotiations, which was naturally turned down. The Portuguese fleet then bombarded the city for nearly two days from the sea shore. He also captured several rice vessels and barbarously cut off the crew's hands, ears and noses, dispatching them with an insulting note to the Zamorin.

A depiction of Gama's fleet (from the Livro das Armadas).

The violent treatment meted out by Gama quickly brought trade along the Malabar Coast of India, upon which Calicut depended, to a standstill. But the Zamorin nonetheless refused to submit to Portuguese terms, and even ventured to hire a fleet of strong corsair warships to challenge Gama's armada (which Gama managed to defeat in a naval battle before Calicut harbor). Gama loaded up with spices at Cochin and Cannanore, small nearby kingdoms, half-vassal and half-at-war with the Zamorin, whose alliances had been secured by prior Portuguese fleets. The 4th armada left India in early 1503. Gama left behind a small squadron of caravels, under the command of his uncle, Vicente Sodré, to patrol the Indian coast, continue harassing Calicut shipping and protect the Portuguese factories at Cochin and Cannanore from the Zamorin's inevitable reprisals.
Vasco da Gama arrived back in Portugal in September 1503, effectively having failed in his mission to bring the Zamorin to submission. This failure, and the subsequent more galling failure of his uncle Vicente Sodré to protect the Portuguese factory in Cochin, probably counted against any further rewards. When the Portuguese king Manuel I of Portugal decided to appoint the first governor and viceroy of Portuguese India in 1505, Vasco da Gama was conspicuously overlooked, and the post given to D. Francisco de Almeida.

Pilgrim ship incident

On his second voyage, Vasco da Gama inflicted acts of cruelty upon competing traders and local inhabitants, which sealed his notoriety in India. During his second voyage toCalicut, da Gama intercepted a ship of Muslim pilgrims at Madayi travelling from Calicut to Mecca. Described in detail by eyewitness Thomé Lopes and chronicler Gaspar Correia as one that is unequalled in cold-blooded cruelty, da Gama looted the ship with over 400 pilgrims on board including 50 women, locked in the passengers, the owner and an ambassador from Egypt and burnt them to death. They offered their wealth which 'could ransom all the Christian slaves in the Kingdom of Fez and much more' but were not spared. Da Gama looked on through the porthole and saw the women bringing up their gold and jewels and holding up their babies to beg for mercy.'

After demanding the expulsion of Muslims from Calicut to the Hindu Zamorin, the latter sent the high priest Talappana Namboothiri (the very same person who conducted da Gama to the Zamorin's chamber during his much celebrated first visit to Calicut in May 1498) for talks. Da Gama called him a spy, ordered the priests' lips and ears to be cut off and after sewing a pair of dog's ears to his head, sent him away.



Third voyage

St. Francis CSI Church, in Kochi. Vasco da Gama, died in Kochi in 1524 when he was on his third visit to India. His body was originally buried in this church.

For the next two decades, Vasco da Gama lived out a quiet life, unwelcome in the royal court and sidelined from Indian affairs. His attempts to return to the favor of Manuel I (including switching over to the Order of Christ in 1507), yielded little. Almeida, the larger-than-life Albuquerque and the efficient Albergaria were the king's new point men for India. But afterFerdinand Magellan defected to the Crown of Castile in 1518, Vasco da Gama threatened to do the same, prompting the king to undertake steps to retain him in Portugal and avoid the embarrassment of losing his own "Admiral of the Seas of India" to Spain. In 1519, after years of ignoring his petitions, King Manuel I finally hurried to give Vasco da Gama a feudal title, appointing him the first Count of Vidigueira, a count title created by a royal decree issued in Évora on 29 December, after a complicated agreement with Dom Jaime, Duke of Braganza, who ceded him on payment the towns of Vidigueira and Vila dos Frades. This decree granted Vasco da Gama and his heirs all the revenues and privileges related, thus establishing da Gama as the first Portuguese count who was not born with royal blood.
After the death of King Manuel I in late 1521, his son and successor, King John III of Portugalset about reviewing the Portuguese government overseas. Turning away from the Albuquerque clique, represented by Diogo Lopes de Sequeira, John III looked for a fresh start. Vasco da Gama re-emerged from his political wilderness as an important advisor to the new king's appointments and strategy. Seeing the new Spanish threat to the Maluku Islands as the priority, Vasco da Gama advised against the obsession with Arabia that had pervaded much of the Manueline period, and continued to be the dominant concern of Duarte de Menezes, then-governor of Portuguese India. Menezes also turned out to be incompetent and corrupt, subject to numerous complaints. As a result, John III decided to appoint Vasco da Gama himself to replace Menezes, confident that the magic of his name and memory of his deeds might better impress his authority, and manage the transition to a new government and new strategy.

By his appointment letter of February 1524, John III granted Vasco da Gama the privileged title of "Viceroy", being only the second Portuguese governor to enjoy that title (the first was Francisco de Almeida in 1505). His second son, Estêvão da Gama was simultaneously appointed Capitão-mor do Mar da Índia ('Captain-major of the Indian Sea', commander of the Indian Ocean naval patrol fleet), to replace Duarte's brother, Luís de Menezes. As a final condition, Gama secured from John III of Portugal the commitment to appoint all his sons successively as Portuguese captains of Malacca.

Tomb of Vasco da Gama in the Jerónimos Monastery in Belém, Lisbon

Setting out in April 1524, with a fleet of fourteen ships, Vasco da Gama took as his flagship the famous large carrack Santa Catarina do Monte Sinai on her last journey to India, along with two of his sons, Estêvão and Paulo. After a troubled journey (four or five of the ships were lost en route), he arrived in India in September. Vasco da Gama immediately invoked his high viceregent powers to impose a new order in Portuguese India, replacing all the old officials with his own appointments. But Gama contracted malaria not long after arriving, and died in the city of Cochin on Christmas Eve in 1524, three months after his arrival. As per royal instructions, Gama was succeeded as governor of India by one the captains who had come with him, Henrique de Menezes (no relation to Duarte). Vasco's sons Estêvão and Paulo immediately lost their posts and joined the returning fleet of early 1525 (along with the dismissed Duarte de Menezes and Luís de Menezes). It is reported that, on the return journey, Luís de Menezes engineered a mutiny and seized control of the Santa Catarina do Monte Sinai, and proceeded to turn to a piratical career.

Vasco da Gama's body was first buried at St. Francis Church, which was located at Fort Kochi in the city of Kochi, but his remains were returned to Portugal in 1539. The body of Vasco da Gama was re-interred in Vidigueira in a casket decorated with gold and jewels.
The Monastery of the Hieronymites, in Belém was erected in honor of his voyage to India.

Legacy

Nineteenth century depiction of Vasco da Gama

As much as anyone after Henry the Navigator, Vasco da Gama was responsible for Portugal's success as an early colonising power. Beside the fact of the first voyage itself, it was his astute mix of politics and war on the other side of the world that placed Portugal in a prominent position in Indian Ocean trade. Following da Gama's initial voyage, the Portuguese crown realized that securing outposts on the eastern coast of Africa would prove vital to maintaining national trade routes to the Far East.

The Portuguese national epic, the Lusíadas of Luís Vaz de Camões, largely concerns Vasco da Gama's voyages.

The 1865 grand opera L'Africaine: Opéra en Cinq Actes, composed by Giacomo Meyerbeerfrom a libretto by Eugène Scribe, prominently includes the character of Vasco da Gama. The events depicted, however, are fictitious. Meyerbeer's working title for the opera was Vasco da Gama. A 1989 production of the opera by the San Francisco Opera featured noted tenorPlácido Domingo in the role of da Gama. The 19th-century composer Louis-Albert Bourgault-Ducoudray composed an eponymous 1872 opera based on da Gama's life and exploits at sea.

The port city of Vasco da Gama in Goa is named after him, as is the crater Vasco da Gamaon the Moon. There are three football clubs in Brazil (including Club de Regatas Vasco da Gama) and Vasco Sports Club in Goa that were also named after him. There exists a church in Kochi, Kerala called Vasco da Gama Church, and a private residence on the island of Saint Helena. The suburb of Vasco in Cape Town also honours him.

A few places in Lisbon's Parque das Nações are named after the explorer, such as the Vasco da Gama Bridge, Vasco da Gama Towerand the Centro Comercial Vasco da Gama shopping centre. The Oceanário in the Parque das Nações has a mascot of a cartoon diver with the name of "Vasco", who is named after the explorer.

Vasco da Gama's Signature (reads Ho Comde Almirante, "The Admiral Count")

Vasco da Gama was the only explorer on the final pool of Os Grandes Portugueses. Although the final shortlist featured other Age of Discovery related people, they were not actually explorers nor navigators for any matter.

The Portuguese Navy has a class of frigates named after him. There are three Vasco da Gama class frigates in total, of which the first one also bears his name.

South African musician Hugh Masekela recorded an anti-colonialist song entitled "Vasco da Gama (The Sailor Man)", which contains the lyrics "Vasco da Gama was no friend of mine". He later recorded another version of this song under the name "Colonial Man".

Vasco da Gama appears as an antagonist in the Indian film Urumi. The film, directed by acclaimed cinematographer Santosh Sivan, depicts a failed assassination attempt on da Gama by an Indian.

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