General Description And Comment

TYit wrlstwatcb firing device is used to provide a delay bclwecn the time an explosive charge thumb ur mine I ยป placed and the time it explodes. The delay period can range Irom a few minutes to 12 hours according to how the watch is altered and seL Either the minute hand (if the desired delay is in hours) or the hour hand {if the desired delay is in minutes) is broken off. One electric lead is cunnarted tn the stem or case of the watch and the second lead is connected to a acre* passing through a hole in the watch crystal. The watch runs for a preset interval until its remaining hand touches the aciew; at that time the circuit is completed and an electrical detonator explodes. The illustration shows an actual installation including the power supply; the inset shows a watch only, io acherntiltc fnrm.

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PrcssuresElectric Firing Devicr

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