American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 283
ce, and hence a mini-mum local resistance. In all pitching, the for.mer, therefore, should be avoided, and the lat-ter secured. To elicit the condition on whichthis depends is our next duty. The questionon this point, then, is, why does the action com-mence before the line of centres, since the… … 252.1302; A p the face of pinion leaf past theline of centres, A b the face of pinion leaf be-fore the line of centres, contacts taking placerespectively at p and b ; angle |)AB = 40°,therefore JAB = 20°. The known quantities being A B =252.1302;and B p = the radius of pitch circle plus ad-dendum =…
Clocks and watches
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