Hale, Joseph W. L. (Joseph Woodwell Ledwidge), 1886- · New York [etc.] McGraw-Hill book company · leaf 36
TRIPLE THREADFig. 20. … I I ! QUADRUPLE THREADFig. 21. vances in one complete turn a distance equal to twice the^^ pitch. For a double thread the 4ead is thereforetwice the ^^ pitch. In a triple thread, as shown in Fig.20, the advance for one complete turn equals three timesthe ^ pitch, or the ^ lead equals three times…
Mechanics, Applied
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