Hiscox, Gardner Dexter, 1822?-1908 · New York, The Norman W. Henley publishing co. · leaf 348
1399. SCREW THREADS.—United States Standard Thread. Flat top andbottom. Depth equals 0.65 of the pitch.Angle 60°. -1400. SCREW THREADS, Whit-worth thread. Rounded top and bot-tom. Depth equals 0.75 of the pitch.Angle 55°. TRAPEZOIDAL i-p*THREAD ! 1 … 1401. SCREW THREADS, Trape-zoidal thread. Angle 90° face, 45 « back.Depth equals 0.75 of the pitch. 338 MILL AND FACTORY APPLIANCES.
Mechanical movements
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