American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 287
at first sight itwould appear to be; for, although the value ofthe leverage may be different in the one armfrom that of the other, the difference isalways constantly the same, and on that ac-count it exercises no pernicious effects on theregularity of the pendulum, more than isexercised when the… … employed with great advantage in variousdescriptions of British clock-work with longas well as with short pendulums. It may betermed a half dead-beat, for while it has theimpulse planes of thedead-beat, it has also alittle recoil. This escape-ment is well adapted forall kinds of clock-workthat is…
Clocks and watches
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