The American watchmaker and jeweler; an encyclopedia for the horologist, jeweler, gold and silversmith .. . pallet staff center, is usu-ally from 3 to 4°. The pallet faces are generally curved full in the middle, as shown inFig. 5. The object of curving the pallets is t© lessen the pitting whichthe wheel teeth make on the pallets. There will, however, be verylittle pitting if the wheels are made small and light, and there is notexcessive drop to the escapement. The advantage of making the backs of the escape wheel teeth radialand the foresides curved, as shown in Fig. 5, is that if the pendulu
The American watchmaker and jeweler; an encyclopedia for the horologist, jeweler, gold and silversmith .. . pallet staff center, is usu-ally from 3 to 4°. The pallet faces are generally curved full in the middle, as shown inFig. 5. The object of curving the pallets is t© lessen the pitting whichthe wheel teeth make on the pallets. There will, however, be verylittle pitting if the wheels are made small and light, and there is notexcessive drop to the escapement. The advantage of making the backs of the escape wheel teeth radialand the foresides curved, as shown in Fig. 5, is that if the pendulum getsexcessive vibration the pallets butt against the roots of the teeth andthe points are uninjured. There is another form of the recoil escapement often used in long-cased clocks, in which the anchor embraces ten teeth of the escapewheel, and the foresides of the teeth are radial. It is shown in Fig. other respects the construction is substantially the same as the onejust described. ANGULAR GEARING. Toothed wheels of irregular outline, used in transmitting variable motion, as shownin Fig. ANGULAR VELOCITY. The anglethrough which an arm turning on its axis isdisplaced in a unit of time. It is entirelyindependent of the length of this arm. TheFig. 7. approximate ratio of the angular velocities of Annealing. 22 the balance with the cylinder and (pocket) chronometer escapementsin the same unit of time (one-fifth second when there are 18,000vibrations per hour), is about 270°: 360°. The velocity, properly socalled, is the space transversed in a unit of time by the point underconsideration (which in this case is taken on the circumference of gyra-tion). For a given angular movement we obtain the aproximate ratioof the velocities by multiplying each radius by the number of vibrationsin a unit of time.—Sattnier. ANNEALING. The process of heating metals and then manipu-lating them in order to increase their ductility. Gold, silver, copper andbrass are annealed by heati
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