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 22
d. The method, in general terms, andgiven in full on pages 22 and 23, is togive, by a table, the distance of thebase circle B, see fig. 19, inside thepitch circle P, and to give by the sametable, the distances or radii ac and adF.c. 13. THE NBw METHoo. f^om thc pitch polut a to ccuters c and d on… … THE OLD RULE.
Gearing
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