Hiscox, Gardner Dexter, 1822?-1908 · New York, The Norman W. Henley publishing co. · leaf 348
WHITWORTH THREAD !/ … 1399. SCREW THREADS.—UnitedStates 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 ^t-jxTHREAD I I
Mechanical movements
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