Hood, Grant · Kansas City, Mo. : Kansas City Jeweler and Optician · leaf 114
he spring enters the collet and the point passingthrough the curb pins are in line. In order to make thespring isochronal, we must at times vary this rule by pin-ning in some cases a trifle less, and in others a trifle morethan equal turns in order that the long and short vibrations 110 THE BALANCE… … Fig. 7. Fig. 6 is a photograph of a Breguet spring showing theovercoil very plainly, and Fig. 7 is a side view of the samespring, showing the elbow; it will be noticed that the springis not flat, the outer coils being lov/er than the center. This 111 MODERN METHODS IN HOROLOGY. is caused by the…
Clocks and watches
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