Appletons' cyclopædia of technical drawing : embracing the principles of construction as applied to practical design ... (1896)
Worthen, W. E. (William Ezra), 1819-1897 · New York : D. Appleton · leaf 461
H^fei1 Cl 446 ENGINEERING DRAWING. … ENGINEERING DRAWING. 447 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…
Mechanical drawing
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