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Scientific American, Vol. 37, No. 9 (September 1877) (1877)

leaf 4

An illustration from Scientific American, Vol. 37, No. 9 (September 1877), 1877, leaf 4
ad to or more shafts at a time and spreads them out upon the stone, to become crooked, requiring the services of a large num- the hole. This is accomplished by means of a file which, at giving them a slight rotary motion by means of his thumb ber of workmen to straighten them. These being thrown… … in a scouring mill and rolled back and forth under Fig. 9.—THE DRILL BENCH. Fig. 5.-PIEBCJN& TBI ITES. © 1877 SCIENTIFIC AMERICAN, INC

Improved · Patents · Supplement · Steel · Consists · Iron · Scientific American · Shaft · Patent office · Large number · Pineal body · Trade mark · American supplement · Ten years · Address munn · Wrought iron · Hot air

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