Fritts, Charles Edgar. [from old catalog] · Philadelphia, The Keystone · leaf 141
osition. So far as concerns the poise, theouter end of the spring is virtually at the point where the studceases to support the coil. And as that point is constantly shift- 128 THE WATCH ADJUSTERS MANUAL. ing, we never can tell where the virtual end is, nor which halfof the coils is the outer half,… … Fig. 25. sprung to one side, that causes still greater variation and un-certainty, for the stud may in such cases support anywherefrom one to half a dozen coils. The poise is not only uncer-tain, but its effect is so much smaller than that of the side pres-sure on the pivots as to be of…
Clocks and watches
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