American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 136
e paral-lel y3 y4, and make n y3 and n y* each =6.3;therefore y3 y* = 12.6; join y3 a and y* a1.Draw perpendiculars to a y3 and a y*, fromo and x; then determine 15 points in thecurve a o o o, as follows : Measure off on thelines a x and a1 x— 1 = 0022 2= 0144 3 = 0467 4 = 1038 5 = 2122 6 = 3720 7=…
Clocks and watches
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