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  2. Pencil detonator - Wikipedia

    en.wikipedia.org/wiki/Pencil_detonator

    The briefcase bomb used in the July 20 plot used a captured British pencil detonator inserted into a block of British plastic explosives weighing approximately two pounds. The bomb was set to 30 minutes and detonated as planned, but Hitler survived with minor injuries. Stauffenberg could not prepare the second block, though. He got rid of it ...

  3. Civil defense siren - Wikipedia

    en.wikipedia.org/wiki/Civil_defense_siren

    The outdoor sirens are tested four times a year on the first non-holiday Monday of March, June, September, and December at 15:00 local time. The test consists of the general alarm for 2 minutes, followed by a 90-second gap before the "all clear" is sounded. There are usually around 15 to 20 general alarms, occurring locally, per year.

  4. Time bomb - Wikipedia

    en.wikipedia.org/wiki/Time_bomb

    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 ...

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  6. 1983 United States Senate bombing - Wikipedia

    en.wikipedia.org/wiki/1983_United_States_Senate...

    Witnesses attested to hearing a loud blast and seeing smoke at the Capitol. [5] FBI officials determined that the bomb was a high-explosive device with delayed timing, consisting of sticks of dynamite with a pocket watch as a timer. [8] A group calling itself Armed Resistance Unit claimed responsibility for the bombing.

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  8. Improvised explosive device - Wikipedia

    en.wikipedia.org/wiki/Improvised_explosive_device

    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

  9. Roof knocking - Wikipedia

    en.wikipedia.org/wiki/Roof_knocking

    Roof knocking (Hebrew: הקש בגג) [1] or "knock on the roof" [2] is a term used by the Israel Defense Forces (IDF) to describe its practice of dropping non-explosive or low-yield devices on the roofs of targeted civilian homes [3] in the occupied Palestinian territories as a prior warning of imminent bombing attacks to give the inhabitants time to flee the attack.