Technical paper . Chain free end of boards to cross beam so that boards a, c, e, g, and * can drop IS inches, and so that boards 6, d,f, and It can drop 9 inches. ^-inch ealvanlsed wire, 116 feet lone To trippin* lever 8-i?d> pulley Wires leadine. PLAN AND ELEVATION OF TYPE B CONCENTRATED description of parts see table on page 29. ROCK-DUST BARRIERS. 31 the length of time during which dust is falling from the inclinedplanks. The operation of the trip lever 7 can be caused by any one of theadvance vanes 11 or 18, hung at various selected distances in ad-vance of the barrier. Vane
Technical paper . Chain free end of boards to cross beam so that boards a, c, e, g, and * can drop IS inches, and so that boards 6, d,f, and It can drop 9 inches. ^-inch ealvanlsed wire, 116 feet lone To trippin* lever 8-i?d> pulley Wires leadine. PLAN AND ELEVATION OF TYPE B CONCENTRATED description of parts see table on page 29. ROCK-DUST BARRIERS. 31 the length of time during which dust is falling from the inclinedplanks. The operation of the trip lever 7 can be caused by any one of theadvance vanes 11 or 18, hung at various selected distances in ad-vance of the barrier. Vane 11 has attached to it a bumping block,25, the other end of which is supported by a wire, 26, to the an explosion wave moves this vane toward the barrier, thebumping block pushes the lower end of lever 7, causing it to disen-gage from lever 6. In some rapidly moving explosions this operation might not bequick enough so that the barrier would fall in time to quench theflame; to provide for such explosions, vane 18 is hung about 100 feetin advance of the barrier, one on either side. Attached to the under-side of vane 18 is a chain, 27, which passes around a sheave, 16,and is then attached to a wire that is secured to the top of the tr
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectminesandmineralresou
