 ... ton. 18 cubic feet of gravel or earth, before digging = 27 cubic feet when dug. 20 cubic feet of quartz broken (of ordinary fineness coming from the hole) = r ton contract measurement.  The Mechanical Miners' Guide - Pagina 23door Andrew Smith Hallidie - 1873 - 52 pagina’sVolledige weergave - Over dit boek
 | P. M. Randall - 1871 - 194 pagina’s
...cubic feet of quartz, unbroken in lode^l ton. 18 cubic feet of gravel or earth, before digging =2 7 cubic feet when dug. 20 cubic feet of quartz, broken (of ordinary fineness coming from the lode) = l ton contract measurement. TABLE XII. HAEDNESS OF MINEEALS— MAP-SCALE. 1.... | |
 | California wire works, San Francisco - 1882 - 224 pagina’s
...feet of quartz, unbroken in lode, equal 1 ton. 18 cubic feet of gravel or earth, before digging, equal 27 cubic feet when dug. 20 cubic feet of quartz broken (of ordinary fineness coming from the lode), equal 1 ton contract measurement. Quantity and Cost of Excavating, Hauling,... | |
 | 1898 - 790 pagina’s
...of earth — i ton. 17 cubic feet of clay — i ton. 13 cubic feet of quart2, unbroken in lode — i ton. 18 cubic feet of gravel or earth, before digging — 27 cubic feet vihen dug. 20 cubic feet of quart2, broken (of ordinary fineness coming from the lode) — i ton contract... | |
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