Thomas, Hugh Kerr · New York : McGraw-Hill Book Co. · leaf 7
Frontspiece. A Fiiteenth Centurv Worm Gear from an Etching bv Albrecht Durer. WORM GEARING BY HUGH KERR THOMAS A. M. I. MECH. E. McGRAW-HILL BOOK COMPANY 239 WEST 39TH STREET. NEW YORK6 BOUVERIE STREET, LONDON, E. C. 1913 < ^i^ Copyright, 1913, by theMcGraw-Hill Book Company \ ^)\
Gearing, Worm
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