Technical paper . ****• concrete, curtains nailed at upper Wk, or woo a betweenedge only- posts /—I- l f ^^ / L .. : v r~ j « • i -. : J J L J J 1, 1 P J t -1 ji J 1 I lx4strips 1 v. SECTION a-b Figure 1.—Plan, elevation, and vertical cross section of rock-dust-protected mine-air stopping. tively quench any flame that might attempt to pass through. Thisform of stopping has proved successful in extinguishing flames ineach of several trials. Plate X, B, shows a set of shelves installed in a mine before thecurtains had been hung. Plate XI, A, shows the same set after thecurtains had been hu
Technical paper . ****• concrete, curtains nailed at upper Wk, or woo a betweenedge only- posts /—I- l f ^^ / L .. : v r~ j « • i -. : J J L J J 1, 1 P J t -1 ji J 1 I lx4strips 1 v. SECTION a-b Figure 1.—Plan, elevation, and vertical cross section of rock-dust-protected mine-air stopping. tively quench any flame that might attempt to pass through. Thisform of stopping has proved successful in extinguishing flames ineach of several trials. Plate X, B, shows a set of shelves installed in a mine before thecurtains had been hung. Plate XI, A, shows the same set after thecurtains had been hung. Plato XI, B, shows the appearance of a rock-dust stopping afteran explosion. A 1-foot space between the two sets of shelves wasfilled with limestone dust. This dust compartment, as anticipated,acted like a solid wall, and the explosion threw down the set ofshelves on the side away from the explosion or the side from which BUREAU OF MINES TECHNICAL PAPER 84 PLATE XI
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectminesandmineralresou
