Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 417
Fig. 943. … MACHINE DESIGN AND MECHANICAL CONSTRUCTIONS. 401 the tubes are cut with a taper thread, uniform with all makers, of 1 in 32 tothe axis. The length of the screwed portion varies with the diameter.
Mechanical drawing
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten20unit-647-283.webp)
