American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 165
lations vary with the length of thesprings. In order to make these vibrationsof the balance isochronal, it has been shownnecessary that the hair-spring during itsmotions be deformed according to the law - —— =j, which law we have illustrated by 156 AMERICAN HOROLOGICAL JOURNAL. Fig. 3; for an… … radii of tne ciroiou oi tne cous vtny unequallyaccording to the angle of motion, and withrespect to the centre of the axis of the balance,as represented by the dotted circles. Themeans of establishing this law in the springthe author has discovered in certain terminalcurves, the conditions and…
Clocks and watches
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