Playtner, H. R. [from old catalog] · Chicago, Hazlitt & Walker · leaf 46
9 action. In this action the guard pin i also acts as the im-pulse pin. We will notice that the passing hollow in thisroller is a rectangular slot the same as in .the ordinaryfork. When the escapement is being unlocked the guardpin i enters the hollow and when the escape tooth comesinto contact… … Fig. 26. Fig. 28. wider the impulse would be transmitted still closer to theline of centers, but the intersection of it with the rollerwould be less. It is very delicate as it is, therefore froma practical standpoint it ought to be made thin but con-sistent with solidity. If the pin is anyway…
Clocks and watches
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