American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 129
hand end of thearm carries a delicate bent lever, j, j, j, aboutas light as an ordinary sewing-needle, andwhich Prof. Young calls a trip-guard ; thislever has near its right hand end a tooth k,which, when the arm A is m its locking posi-tion, drops behind the stop i and preventsthe arm from being… … the arm B. This movement raises the otherend lever and throws the tooth k clear of thestop i, leaving the arm A free to move. A little behind the locking arm lies the im-pulse arm B, and attached to the same axis fis an arm on which is an adjustable weight d,for varying the impulse given to the…
Clocks and watches
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