Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 356
dimension should be somewhat in-creased. The side of square next the foot-plateshould be, say for a lever of 30, I; of 4 feet, 1^-,of 5 feet, 1^; the form and taper as in the hand-lever.752 and 753 are views of a hand-crank. The diameter of the handles,for convenience in grasping, should not be… … in the figure. The length of handle for a single man should be from 10 to12; for two men, from 20 to 24; the crank from 15 to 18, and the heightof shaft above the foot support for the men from 2 10 to 3 2. In the construction of steam engines the makers adopt simple rules of pro-portion between the…
Mechanical drawing
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