Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 358
Fig. 7.-38. MACHINE DESIGN AND MECHANICAL CONSTRUCTIONS. 3^1 … 342 MACHINE DESIGN AND MECHANICAL CONSTRUCTIONS. having rotation about the main crank-shaft, used on small steam engines in-stead of an eccentric to give motion to the valve-rod. With its centre on the
Mechanical drawing
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