A handbook on the teeth of gears, their curves, properties, and practical construction (1887)
Grant, George B. (George Barnard), 1849-1917 · [Boston] · leaf 41
THE NORMAL. A normal to any curve is a straight lineiV^, Fig. 1, which is at right angles with it atthe point of intersection. T4g:2 … Curve andnortnalis Rolling ivlieels EOLLINQ WHEELS. If two friction wheels. Fig. 2, roll on eachother, their pitch lines touching at the pitchpoint 0, they are, for the instant, revolvingabout centers A and B, which are in A 0 B^the common normal or line of centers of thetwo curves at their common…
Gearing
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