. Bulletin . , inches. NO ADVANTAGE FROM EXTRA DETONATOR IN DYNAMITE. These results indicate that there is no advantage in using an extradetonator in the dynamite. Moreover, this practice is also dangerous,for many accidents have occurred in coal mines while combinationcharges containing detonators were being loaded. This danger in-creases when squibs are used for firing, for it is then necessary toinsert a needle through the stemming and into the charge of blackblasting powder, and there is always a possibility of the needle com-ing in contact with any detonator that is present in the ch
. Bulletin . , inches. NO ADVANTAGE FROM EXTRA DETONATOR IN DYNAMITE. These results indicate that there is no advantage in using an extradetonator in the dynamite. Moreover, this practice is also dangerous,for many accidents have occurred in coal mines while combinationcharges containing detonators were being loaded. This danger in-creases when squibs are used for firing, for it is then necessary toinsert a needle through the stemming and into the charge of blackblasting powder, and there is always a possibility of the needle com-ing in contact with any detonator that is present in the charge. The practice of using combination charges in coal mines offers noadvantage, and, as there are many dangers attendant upon their use,the practice should be discouraged. ELECTRIC IGNITERS. Electric igniters are similar in construction to electric detonatorsexcept that the capsules are made of paper or wood and are chargedwith a gunpowder mixture instead of a fulminate. BUREAU OF MINES BULLETIN 80 PLATE XI. A. SECONDARY BATTERY, FIRING MACHINE, AND DRY CELL.
Size: 2309px × 1083px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectminesandmineralresou
