Hood, Grant · Kansas City, Mo. : Kansas City Jeweler and Optician · leaf 106
difficulty, the tools shown in Figs. 1 and 2 weremade; both work on the same principle, clamping the colleton the top and bottom instead -of depending oh the frictionas before. It will be readily seen that it is possible to holdthe collet solid enough to force a pin in until the spring will 102 THE… … Fig. I. Fig. 2. can do the most of it. The truing of the spring is a verydifficult task to most workmen, but should not be so. Thesprings as made, represent a perfect spiral, each coil grad-ually receding from the center; this being the case, if thespring- is perfectly centered, placed on the staff…
Clocks and watches
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