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Scientific American, Vol. 37, No. 9 (1877) (1877)
leaf 4
f them be provided with the groove serving to guide the thread to or more shafts at a time and spreads them out upon the stone, to become crooked, requiring the services cf 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… … 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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