Delay Systems Initiated by Clocks and Timers

Delays provide a method both for arming and initiating an explosive or arson device after a set period of time has elapsed. Some are electronically-controlled and are very precise.  Physical and chemical principles govern the other improvised delay systems, which tend to be less accurate.  Nevertheless, these low-precision delays are frequently used by bombers and arsonists. 
See also arson devices.

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