Bulletin . try that contains explosive or noxious gases, a miner should nailthe canvas on the intake side to avoid danger from the gases. ROCK-DUST-PROTECTED STOPPING. A rock-dust-protected stopping has been designed by George , chief mining engineer of the Bureau of Mines, for checkingexplosions that may pass through a crosscut. In one explosion testat the bureaus experimental mine it prevented an explosion fromentering the butt headings, and in other tests, when placed in cross-cuts, it prevented the explosion in one butt from passing into theparallel butt entry. The construction of th
Bulletin . try that contains explosive or noxious gases, a miner should nailthe canvas on the intake side to avoid danger from the gases. ROCK-DUST-PROTECTED STOPPING. A rock-dust-protected stopping has been designed by George , chief mining engineer of the Bureau of Mines, for checkingexplosions that may pass through a crosscut. In one explosion testat the bureaus experimental mine it prevented an explosion fromentering the butt headings, and in other tests, when placed in cross-cuts, it prevented the explosion in one butt from passing into theparallel butt entry. The construction of the stopping and methodof erection are fuUy described in Technical Paper 84 « of the bureau. The stopping is a double one, as shown in figure 4. The principleis that when pressure from a slight explosion is thrown on the stop- a Rice, G. S., and Jones, L. M., Methods of preventing and limiting explosions in coal mines: TechnicalPaper 84, Bureau ol Mines, 1915, pp. 32-35. BUREAU OF MINES BULLETIN 99 PLATE III. A. ROCK-DUST-PROTECTED STOPPING.
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