A handbook on the teeth of gears, their curves, properties, and practical construction (1890)
Grant, George B. (George Barnard), 1849-1917 · Lexington, Mass., Lexington Gear Works · leaf 38
THE NOEMAL. A normal to any curve is a straight linei\r, Fig. 1, which is at right angles with it atthe point of intersection. Fig,2 … Curve andnormaljs Moiling ivJieels KOLLING 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 ^ OB,the common normal or line of centers of thetwo curves at their common…
Gearing
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