424 tiME KEEPERS. 



Defcnptlon of the next too(I) C of (lie wheel is almoft in contaft with Ihe 

 the Efcapement Jocking pallet tn (fee Fig. 4) fo that the inftant the looih K 

 ihaw's time "rops off the wheel is again locked, and the aflion of thaf. 

 piece. looth upon the balance is finiftied. As the balance moves with 



the greateft freedom upon its pivots, the force of the tooth has , 

 given it a confnlerabie velocity, fo that the balance f^'d keeps 

 moving on in the fame direction, after the preflure of the tooth 

 is removed by flipping off from the pallet, until the force of the 

 pendulum fpring (which is not reprefented in the figure) being 

 continually increafed by being wound up, overcomes the 

 momentum of the balance, which, for an inftant of time, is 

 then flationary, but immediately returns by the action of the 

 pendulum fpring, which exerts a confiderable force upon it 

 in unwinding itfelf. As the balance returns, the point i of 

 the lifting pallet in pafTes by the ends of the two fprings EP 

 and Vo, and, in paffing by, puflies the projecting end, o, of 

 the flender fpring in towards the balance- wheel, until it has 

 pafled it ; which, as foon as it has done, the projeding end o 

 again returns and applies ilfelfclofe (o the hooked end of the 

 fpring EF, as before. The fpring yo is made fo ilender, that 

 it gives but little refiftance to the balance, during the time the 

 point i of the lifting pallet is paffing it, and of courfe caufes but 

 'little (if any) decreafe in its momentum. During the time the 

 point /of the lifting pallet is pafling the fmall fpring yo, the long 

 fpring EF remains fteadily bearing againft the head of the 

 adjuring Icrevv ?«, as the hooked end at o juft lets the end of 

 the lilting pallet pafs by without touching of it. As the fpring 

 has now been continually ading upon the balance, from the 

 extremity of its vibration in the direction MSK, it has given it 

 the greateft velocity, when the point i of the lifting pallet is 

 paffing the end o of the flender fpring ; for at this inftant the 

 fpring which was wound up by the contrary direction of the 

 balance, is now unwound again, or in the fame ftate as it was 

 in its quiefcent pofttion at flrft, and of courfe has no efl^eft 

 iipori the balance at all in either direction ; but the balance 

 having now all the velocity it could acquire from the unwinding 

 of the fpring, goes on in the direction UV^HL, until the force 

 of this fpring again flops it and brings it back again, hioving 

 in the fame dire6lion as at firf^, with a confiderable Velocity* 

 By this return of the balance, the point i of the lifting pallet 

 comes "up again to the projecting end o of the flender fpring^^ 



palhes 



