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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
ans 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 the same time, removes any burrs or other irregularities that and forefinger. In order to prevent the formation of rust may still be remaining. the grindstone must… … in a scouring mill and rolled back and forth under Fig. 9.—THE DRILL BENCH. Fig. 5.-PIEBCJN& TBI ITES. © 1877 SCIENTIFIC AMERICAN, INC

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