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Diagram of a simple time bomb in the form of a pipe bomb. The explosive charge is the main component of any bomb, and makes up most of the size and weight of it. It is the damaging element of the bomb (along with any fragments or shrapnel the explosion might produce with its container or neighboring objects).
A pencil detonator or time pencil is a time fuze designed to be connected to a detonator or short length of safety fuse. They are about the same size and shape as a pencil , hence the name. They were introduced during World War II and developed at Aston House , Hertfordshire , UK .
Time fuzes detonate after a set period of time by using one or more combinations of mechanical, electronic, pyrotechnic or even chemical timers. Depending on the technology used, the device may self-destruct [ 21 ] (or render itself safe without detonation [ 22 ] ) some seconds, minutes, hours, days, or even months after being deployed.
The Cold War ended in 1991, but the looming threat of nuclear attack lives on with more than 14,900 nuclear weapons wielded by nine nations.. A terrorist-caused nuclear detonation is one of 15 ...
The time delay mechanism was simple but effective: after being dropped from the aircraft a small propeller at the rear of the bomb revolved, gradually screwing a metal rod into the fuze, crushing an ampoule inside it, which contained a solution of alcohol and acetone solvent. When this happened the fuze was fully armed and the timer countdown ...
A delay-action bomb is an aerial bomb designed to explode some time after impact, with the bomb's fuzes set to delay the explosion for times ranging from very brief to several weeks. Short delays are used to allow the bomb to penetrate before exploding: "a delay action bomb striking the roof of a tall building will penetrate through several ...
Two survivors of the bombing — each 100 or older — are planning to return to Pearl Harbor on Saturday to observe the 83rd anniversary of the attack that thrust the US into World War II.
Langsdorf chose a clock to reflect the urgency of the problem: like a countdown, the Clock suggests that destruction will naturally occur unless someone takes action to stop it. [ 11 ] In January 2007, designer Michael Bierut , who was on the Bulletin ' s Governing Board, redesigned the Doomsday Clock to give it a more modern feel.