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A time bomb's timing mechanism may be professionally manufactured either separately or as part of the device, or it may be improvised from an ordinary household timer such as a wind-up alarm clock, wrist watch, digital kitchen timer, or notebook computer. The timer can be programmed to count up or count down (usually the latter; as the bomb ...
These devices would detonate the bomb if it was moved in any way. Typically, the safety-arming device used was a clockwork Memopark timer, which armed the bomb up to 60 minutes after it was placed [92] by completing an electrical circuit supplying power to the anti-handling
The Harrods bombing refers to the car bomb that exploded outside Harrods department store in central London, England, on Saturday 17 December 1983.Members of the Provisional Irish Republican Army planted the time bomb and sent a warning 37 minutes before it exploded, but the area was not evacuated.
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The bomb was adapted from a British plastic explosive, which had been seized by the Abwehr from captured SOE agents. The pencil detonator consisted of a thin copper tube containing copper chloride that would take about ten minutes to silently eat through wire holding back the spring-loaded firing pin from the percussion cap .
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 ...
A typical kitchen timer. A timer or countdown timer is a type of clock that starts from a specified time duration and stops upon reaching 00:00. An example of a simple timer is an hourglass. Commonly, a timer triggers an alarm when it ends. A timer can be implemented through hardware or software.