Fritts, Charles Edgar. [from old catalog] · Philadelphia, The Keystone · leaf 68
Fig. 6. Fig. 7. make perfect contact. Short conical points (screwed in) mayproject from the surface of the disc and sit into cavities in thecaps, to hold the parts in proper position, after the manner ofshort, stubby steady pins. Or the caps can be turned out so asto sit down a little over the edge…
Clocks and watches
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