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Scientific American, Vol. 37, No. 24 (1877) (1877)
leaf 7
for drilling, and is furnished with steel spur been much simplified in the mechanism for the feed and the the effects of expansion and contraction, while it mmay be and pointed centers. The rest has all the adjustments com- easily removed-for renewal or repairing. percussion. The piston of the… … ing of the bridge being :re- per stroke of the piston is 85 moved as desired by drawing cubic inches. © 1877 SCIENTIFIC AMERICAN, INCInternet Archive · Public domain (published before 1931). Free to use for anything.
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