Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 211
Fig. 387. … Fig these axles in opposite directions by a single turn of the axle. The weight is only raisedor lowered by the difference between these two circumferences; one takes up while theother lets out, and the P, to balance W, must be as these differences of circumference ofaxles IS to the circumference…
Mechanical drawing
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