Williams, Henry Smith, 1863-, Williams, Edward Huntington, 1868-1944, joint author · New York and London, The Goodhue company · leaf 312
maybe detected by lowering a lighted candle into a sus-pected cavity, the light being extinguished at once ifthe gas is present. To rid the cavity of it, forcedventilation is used where possible, the gas being scat-tered by draughts of fresh air. If this is impracticable,and the cavity small, the… … ^- ,.^. ^^ \ ^^Z---- -^^^B ^-^.^ -^ M. NS2835. 1 .Mfl^^H^^^^^^I^^^^^IlK^^ 9 IB mf^^^^ A FLINT-AND-STEEL OUTFIT, AND A MINERS STEEL MILL The upper picture shows a flint-and-steel outfit, the implements for lighting a fire beforethe days of matches. The lower picture shows a miners steel mill, which…
Industrial arts · Machinery
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