Hood, Grant · Kansas City, Mo. : Kansas City Jeweler and Optician · leaf 63
about 2-10 m-m. In cases where the hair-spring stud is stationary andcannot be raised or lowered, a difficulty presents itself; if weget our balance a trifle too high, our hair-spring will be highin the center, and should it be too low, the spring will be lowin the center. All watches of this kind,… … Fig- 3- the thickness of the balance arm and we have the exactdistance from the end of the top pivot to the shoulder for thebalance. The hub of the staff should be slightly less in diameterthan the width of the arm of the balance and have a grace-ful taper; the roller should fit squarely against…
Clocks and watches
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