Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 241
, commencing at its firstposition, and the forward and backwarji eccentricpaths are similarly divided, also commencing at thefirst position. The length of the eccentric rod isthen taken in the compasses and an arc described ,from the point 1 of the fore eccentric, and anotherfrom V of the back… … MECHANICS. 225
Mechanical drawing
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