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Scientific American, Vol. 37, No. 9 (1877) (1877)
leaf 4
h, 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 be kept dry so… … in a scouring mill and rolled back and forth under © 1877 SCIENTIFIC AMERICAN, INCInternet Archive · Public domain (published before 1931). Free to use for anything.
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