Essentials of drafting; a text and problem book for apprentice, trade and evening technical schools (1918)
Svensen, Carl L. (Carl Lars), 1884- · New York, D. Van Nostrand company · leaf 59
F/g. 90 … F/g. 91 The forms described above are the ones most commonly usedfor fastening parts together. Fig. 86 shows the square thread, a form well adapted for usein transmitting motion. The Acme thread, a modification of the square thread, is shownin Fig. 87. The angle may be either 29 or 30 degrees.…
Mechanical drawing
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