American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 281
. But wehave to consider the relative directions of thewheel and pinion points of contact, as the con-ditions on which the answer to our questionhinges. These relative motions of the contacts 272 AMERICAN HOROLOGICAL JOURNAL. can be determined by their ratio to their com-mon property, viz., the… … points of any rotating body, say a pinion; letus trace the relative distance of a point in thecircumference, from the line A B during asemi-rotation, which may here indicate the pos-ition and direction of the line of centres in adepth o. o, d, e, B and o, c d e, is the arcdescribed by point o, and…
Clocks and watches
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