Machine drawing; a text and problem book for technical students and draftsmen (1921)
Svensen, Carl L. (Carl Lars), 1884- · New York, D. Van Nostrand company · leaf 162
Sca/e e = I Ft Fig. 247. Probs. 22, 23, 24 and 25. … Fig. 248. Probs. 26, 27, 28 and 29. SCREWS AND BOLTS 191. The Helix.—A cylindrical heKx is a curve generated by a point on the surfaceof a cylinder, moving equal distances lengthwise of the cyUnder while it is movingequal distances around the cylinder. In Fig. 249 the diameter and pitch of the…
Machinery
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