American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 163
ng,separate its two ends. There is in this angle,or what is the same thing, in the total lengthof the hair-spring, an element by means ofwhich we may reach the closest possibleapproximation to isochronism, by making itlonger or shorter. In tracing these curves graphically, theauthor proceeds in the… … leave the coils, be fixed at any angle of be-tween 180° to 270° of arc from A around thecentre O. Draw radius O C, and anotherO D, perpendicular to the first. (The draw-ing must be made on an enlarged scale; themost convenient may be twenty or thirtytimes the real eize of the hair-spring.) Now, a…
Clocks and watches
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