Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 463
446 ENGINEERING DRAWING. … ENGINEERING DRAWING. MY there is a worm-wheel, driven by a worm or screw on a shaft perpendicular tothe pinion-shaft. The worm-shaft can be driven either by a hand-wheel at oneend, or by ihe friction-bevel at the other. The friction-bevel can be driven ineither direction by being brought in contact…
Mechanical drawing
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