Scientific American, «5 January ii, 1908. *AT2l. AN APPARATUS FOB INDICATING FIRE DAMP IN COAL dipped. By contact between H and c, the relay in the … tical arm is made by means of the mercury cup, m by their weights, W and W, respectively. The case of (see engraving), into which a wire from the beam is balance No. 2 is then filled with pure fire damp at Instrument for Indicating Fire Damp in Mines. AN INSTBUMENT FOB INDICATING FIBE DAMP IN MINIS.
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