American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 113
he lines g cross thelines t, draw a circle I, which indicates theplace for the ruby pin n. Next proceed todetermine the breadth of the ruby pin, whichin all cases must be one-third the space be-tween two teeth of the escape wheel. To de-termine the working sides of the slot in the 10 i AMERICAN… … the lever u are to be drawn from, and are tobe drawn thus : From the centre of lever Bmark off the dots p, 1|° distant from the lines/, and place one leg of the compass on one ofthese dots, and draw the curve u of the op-posite horn, proceeding in like manner withthe other horn. To determine the…
Clocks and watches
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