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 39
ershapes will have the peculiar property thatthey will continually touch each other, andnot separate at all from the first touch to thelast. The latter property is evidently of thegreatest mechanical value, for teeth that haveit can be used to forcibly transmit a uniformmotion from one rotating… … Normal intersection THE LAW OF NORMAL INTEESECTION. If the two odontoids, iV and M, Fig. 4, areconjugate they are always in driving contact.They must always be tangent and not inter-sect at some one point P, and they must havea common normal, 0 P, at that point, whichwill intersect the line of…
Gearing
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