. Bulletin . FUSE, DETONATORS, AND ELECTRIC DETONATORS. 33 Class 1 is cheaply constructed, has no waterproof qualities, andrequires great care in manipulation. Its use is small and it is notconsidered reliable. Class 2 is better than class 1, but has not all the requirements of agood fuse. It will stand immersion under a few inches of water fora few minutes, but it is not recommended for general use. Thisclass, as well as class 1, is invariably subject to lateral sparking whenburning. Classes 3, 4, and 5 are well made. They will stand immersion inshallow water 30 minutes, 24 hours, and 96 hour
. Bulletin . FUSE, DETONATORS, AND ELECTRIC DETONATORS. 33 Class 1 is cheaply constructed, has no waterproof qualities, andrequires great care in manipulation. Its use is small and it is notconsidered reliable. Class 2 is better than class 1, but has not all the requirements of agood fuse. It will stand immersion under a few inches of water fora few minutes, but it is not recommended for general use. Thisclass, as well as class 1, is invariably subject to lateral sparking whenburning. Classes 3, 4, and 5 are well made. They will stand immersion inshallow water 30 minutes, 24 hours, and 96 hours, respectively. InI •inning they show little, if any, lateral sparking or glowing. Theyusually burn quietly and steadily and will not burst nor metal mines, where it is often necessary to use different lengths offuse at the same time in order to fire dependent shots, the projectingends of the different lengths, if the fuse is of these grades, can becoiled and placed in the mouth of a drill hole
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectminesandmineralresou
