Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts (1880)
D. Appleton and Company, Benjamin, Park, 1849-1922 · New York, D. Appleton · leaf 28
We have, then: Pitch x number = circumference ; whence, if either two factors be given, we readilyfind the third. It is clearly more convenient to express the pitch in whole numbers or manageablefractions, as 2-inch pitch, U-inch pitch, and so on. But the circumference being 3.1416 times…
Mechanical engineering -- Dictionaries
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