The American watchmaker and jeweler; an encyclopedia for the horologist, jeweler, gold and silversmith .. . a hollow sleeve A, terminating in a foot B. Through this is screwed the rod C,terminating in a pivot Z>, which is small enough to enter the smallestjewel To ascertain the right height for the roller, place it upon thefoot B, indicated in Fig. 20, and set the pivotof the tool in the foot jevvel,and adjust the screw until the roller is in theproper relation to the lever fork as shown inthe illustration. In Fig, 20 the potence andplate of the watch are siiown in section at ^.The roller i
The American watchmaker and jeweler; an encyclopedia for the horologist, jeweler, gold and silversmith .. . a hollow sleeve A, terminating in a foot B. Through this is screwed the rod C,terminating in a pivot Z>, which is small enough to enter the smallestjewel To ascertain the right height for the roller, place it upon thefoot B, indicated in Fig. 20, and set the pivotof the tool in the foot jevvel,and adjust the screw until the roller is in theproper relation to the lever fork as shown inthe illustration. In Fig, 20 the potence andplate of the watch are siiown in section at ^.The roller is indicated at c and the lever forkat d. After the adjusting of the roller is com-pleted, remove the tool and apply it to therough staff as indicated in Fig 21, at yl, andthe point at which the seat for the rollershould be cut will be shown. In order toascertain the height of the balance, apply thegauge as before and bring the points, so as to give sufficient clearancebelow the plate as indicated by the dotted lines at B, Fig. 20. Thenipply the gauge to the work as indicated at B, Fig. 21, and turn the. Fig. 20. rfC^;: <=t(^^ Fig. 21. balance seat at the point indicated. The diameter of the seat for theroller, balance and hairspring collet, can be taken from the old staff. X Other measuring instruments for this jjurpose will be found under Gauges. 39 Balance Staff. Ill III 1 1 Ml 11 1 M I M 1 1 1 T 1 III 1 III 11 II 1 1 I 1 1 1 1 1 B Fig. 22. or gauge the holes with a taper arbor or a round broach, and then takethe size from the broach with caHpers. The diameter of the lower pivot should be taken from the jewel, andthe ordinary pivot gauge, when used in connection with a round pivotbroach, is all that is necessary evenfor the finest work. At A, in , is shown the gauge, each divis-ion of which corresponds to about25^00 ^^ ^^ inch. Slip the jewel onthe broach as far as it will go with-out forcing, as shown at B, Fig. 22,and then take the size of the broach,close up to th
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Keywords: ., bookcentury1800, bookdecade1890, bookidamericanwatc, bookyear1892
