Mechanical movements, powers and devices; a treatise describing mechanical movements and devices used in construcive and operative mechinery and the mechanical arts, being practically a mechanical dictionary (1917)
Hiscox, Gardner Dexter, 1822?-1908 · New York : The Norman W. Henley publishing co. · leaf 344
n WHITWORTH THREAD j/ … 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 550. TRAPEZOIDAL +p*THREAD I •
Mechanical movements
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.