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Scientific American, Vol. 34, No. 13 (1876) (1876)

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An illustration from Scientific American, Vol. 34, No. 13 (1876), 1876, leaf 0 — petits per Annum, sa Vol. XXXIV.—No. NEW YORK, MARCH 25, 1876. (NEW SERIES.) (POSTAGE PREPAID. ] MULTIPLE DRILLING MACHINE. ing of course is loosened. D is the belt drum on the end of nized by engineers, and the same is true of steel, where the … of petroleum and turpentine, steel annealed to straw yellow of the small cotter, and this may be done without stopping can likewise be turned. the revolution of the spindle, as would have to be done in We know of no direct practical confirmation of this, but the case of an ordinary cotter, or a set…

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