Los Alamos Scientific Laboratory

Nuclear Weapon of the "Fat Man" type, the kind detonated over Nagasaki, Japan, in World War II. he-bomb is 60-inches in diameter and 128- inches long'. The second nuclear weapon to be detonated. it weighed about 10,000 pounds and had a yield of equivalent to approximately 20,000 tons of high explosive.

The experimental prototype of an atomic bomb called the Gadget waits at the base of the Trinity test tower near Alamogordo, New Mexico, before it lifted into firing position and successfully tested.

Three leading physicists (L-R), Ernest O. Lawrence, Enrico Fermi, and Isidor I. Rabi, gather at Los Alamos National Laboratory during their work on the atomic bomb (Manhattan Project).

The first successful test of an atomic bomb, Alamogordo, New Mexico, taken by an engineer who assisted on the test.

Nuclear weapon of the "Little Boy" type, the kind detonated over Hiroshima, Japan, in World War II. The bomb is 28 inches in diameter and 120 inches long. The first nuclear weapon ever detonated, it weighed about 9,000 pounds and had a yield equivalent to approximately 20,000 tons of high explosive.