Playtner, H. R. [from old catalog] · Chicago, Hazlitt & Walker · leaf 19
dcircular pallets, as the unlocking can be performed on thetangent and the lifting arms are of equal length. The wheel,however, is so much heavier as to considerably increase theinertia; also, we have a metal surface of quite an extentsliding over a thin jewel. For practical reasons, therefore,it… … Fig. 4. should be as small as possible consistent with perfect free-dom of action. In so far as angular measurements are concerned, no hardand fast rule can be applied to it, the larger the escape wheelthe smaller should be the angle allowed for drop. Authori-ties on the subject allow iy2° drop for…
Clocks and watches
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