Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 359
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 … Fig. 759. central line of the main shaft there will be no motion, and used for the posi-tion of an oil cup, the oil flowing down the moving arm for the lubrication ofthe crank-journal. Eccentrics.—An eccentric is a modified crank ; the crank-pin is enlarged so as to include the crank-shaft; motion
Mechanical drawing
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