3.

Fat Man: The Atomic Bomb Dropped on Nagasaki
(3.5m long× 1.5m in diameter, 4.5tons)

At 11:02a.m. on August 9th 1945, three days after the bombing of Hiroshima and with Japan nearing defeat in WWII, a second atomic bomb was dropped on Nagasaki by an American long-range B29 bomber.