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Scientific American, Vol. 39, No. 26 (1878) (1878)
leaf 7
rtions, PRESS, Nearly every size and description of power cutting, draw- An exceedingly difficult piece of underground enginecring, A B, of the holder, to receive the tooth, C, and there is a ing, and double action, also screw lever, pendulum, and and one which furnishes an admirable illustration… … neling in opposite directions cleared hibited there. away the last barrier, and met face to Further information may be had © 1878 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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