. Standardization of mining methods; a series of important articles reprinted from Engineering and mining journal. Fig. 1. Explosives Magazine in Hillside The powder house should have double doors, withopenings large enough to admit a mans hand, so thatthey may be locked from the inside. This is effectualin preventing any one working at the lock in an en-deavor to pick or strike it with a hammer. Fig. 1is an illustration of such a magazine. In this case EXPLOSIVES 49 there is one main adit leading into the hillside, closedby double doors, locked from the inside. In Fig. 2a plan view is given o
. Standardization of mining methods; a series of important articles reprinted from Engineering and mining journal. Fig. 1. Explosives Magazine in Hillside The powder house should have double doors, withopenings large enough to admit a mans hand, so thatthey may be locked from the inside. This is effectualin preventing any one working at the lock in an en-deavor to pick or strike it with a hammer. Fig. 1is an illustration of such a magazine. In this case EXPLOSIVES 49 there is one main adit leading into the hillside, closedby double doors, locked from the inside. In Fig. 2a plan view is given of the parallel drifts leading fromthe main tunnel, showing the placing of chimney and thedifferent compartments in the magazine. When the powder is transported from the surfacemagazine to the different mine shafts, it should notbe left at the collar of the shaft longer than is abso- 1 ^Chimney to Surface I. i I wmm rmoN DOOR Entrance lx> Magaz/ne Fig. 2. Plan of Powder Magazine lutely necessary, as many accidents have occurredthrough the explosion of powder there, before beingtaken underground. This is of the utmost importance. 60 STANDARDIZATION OF MINING METHODS I have recently noted cases where the powder is takento the collar and left there for an hour in the morningduring the time when the shift is going to work. Not more than one days supply of powder should,of course, be taken underground. Powder should neverbe lowered with tools or supplies of any kind, as thatwill establish a practice which will lead to the lower-ing of powder with steel and similar material. At thedifferent shaft stations it should be a rule that thepowder men must remove the powder from the stations
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