Bulletin . rick,orwoo<l tetween josts. SECTION a-b Figure 4.—Rock-dust-protected stopping designed by Bureau of Mines. be necessary to put waterproofing over the stopping so that thewater may be deflected to one side or the other. Galvanized-uonsheets may be used or the walls may be plastered with neat III, A, shows the rock-dust-protected stopping as erectedat the bureaus experimental mine. COLLAPSIBLE STOPPING. A great deal has been written about the use of collapsible stop-pings which would go out at the instant of an explosion and thusrelieve the pressure of the explosion w
Bulletin . rick,orwoo<l tetween josts. SECTION a-b Figure 4.—Rock-dust-protected stopping designed by Bureau of Mines. be necessary to put waterproofing over the stopping so that thewater may be deflected to one side or the other. Galvanized-uonsheets may be used or the walls may be plastered with neat III, A, shows the rock-dust-protected stopping as erectedat the bureaus experimental mine. COLLAPSIBLE STOPPING. A great deal has been written about the use of collapsible stop-pings which would go out at the instant of an explosion and thusrelieve the pressure of the explosion wave. The writer beheves thatthe arguments for and against the use of these stoppings are not 24 MINE-VENTILATION STOPPINGS. conclusive, and that the initiation of an explosion should be pre-vented by the use of permissible explosives, by efficient humidifica-tion, and by ample ventilation to prevent the accumulation ofpockets of methane, rather than that recourse should be had to affimsy stopping which will permit the leakage of air re
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectminesandmineralresou
