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Scientific American, Vol. 50, No. 3 (January 1884) (1884)
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e effected by means the center and blast holes being drilled all around. which is to be found in the market in ready-made cartridges. of an electric distribution furnished by the same generating Rock cutting, which is employed only in large exploita- The quantity of powder to be used is from six to… … APPLICATION OP ELECTRICITY TO TUNNELING. © 1884 SCIENTIFIC AMERICAN, INCPatented · Patents · Iron · Upper · Apparatus · Scientific American · Address munn · Square inch · Numbered receipt · Cast Iron · Horse power · Lead pipes · Good faith · Ice sheets · Mould board
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