The American watchmaker and jeweler; an encyclopedia for the horologist, jeweler, gold and silversmith .. . icity is more apparent than real, for it requires very great care in itsconstruction, or otherwise its accuracy cannot be relied upon. Britten gives the following very concise description of the action andproportion of the escapement: ACTION OF THE ESCAPEMENT. Fig. 199 shows the most usual form of the lever escapement, in whichthe pallets escape over three teeth of the wheel. A tooth of the escapewheel is at rest upon the locking face of the entering left-hand impulse pin has
The American watchmaker and jeweler; an encyclopedia for the horologist, jeweler, gold and silversmith .. . icity is more apparent than real, for it requires very great care in itsconstruction, or otherwise its accuracy cannot be relied upon. Britten gives the following very concise description of the action andproportion of the escapement: ACTION OF THE ESCAPEMENT. Fig. 199 shows the most usual form of the lever escapement, in whichthe pallets escape over three teeth of the wheel. A tooth of the escapewheel is at rest upon the locking face of the entering left-hand impulse pin has justentered the notch of the lever,and is about to unlock thepallet. The action of theescapement is as follows: Thebalance, which is attached tothe same staff as the roller, istraveling in the direction indi-cated by the arrow, which is / / N ^ ^ -^around the roller, with suffi- Fig. energy to cause the ruby pin to move the lever and pallets farenough to release the wheel tooth from the locking face, and allow it toenter on the impulse face of the pallet. Directly it is at liberty, the escape. 319 Lever Escapement. wheel, actuated by the mainspring of the watch, moves around the sameway as the arrow and pushes the pallet out of its path. By the time thewheel tooth has got to the end of the impulse face of the pallet, itsmotion is arrested by the exit or right-hand pallet, the locking face ofwhich has been brought into position to receive another tooth of thewheel. When the pallet was pushed aside by the wheel tooth it carriedwith it the lever, which in its turn communicated a sufficient blow to theruby pin to send the balance with renewed energy on its vibration. Sothat the ruby pin has the double office of unlocking the pallets by givinga blow on one side of the notch of the lever, and of immediately receiv-ing a blow from the opposite side of the notch. The balance proceedson its excursion, winding up the balance spring as it goes, until its energyis expended. After
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Keywords: ., bookcentury1800, bookdecade1890, bookidamericanwatc, bookyear1892
