what is safety fuse ?
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Answer :- fuse that burns slowly for communicating fire to a detonator or blasting cap and that consists usually of a train of fine black powder surrounded by a tight wrapping
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The safety fuse is a type of fuse invented and patented by English inventor William Bickford in 1831. Originally it consisted of a "tube" of gunpowder surrounded by a waterproofed varnished jute "rope." It replaced earlier and less reliable methods of igniting gunpowder blasting charges which had caused many injuries and deaths in the mining industry. The safety fuse burns at a rate of typically about 30 seconds per foot (1 second per cm)
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