422 TIME KEEPERS. 



Defer! ptl on of from the cenfef of the verge. Having defcribed the feveral 



the Efcapement pgrts as ihey appear in the figure, we next come to their con- 

 ot Mr. Earn- "^ . / ■ . , J^ ^ , , -r . . 



ihaw's time nexioii or litiiadon with refped to each other. Let the long 



piece. fpring EF be fuppofed to be (b placed that the end of the flender 



fpring yi may proje6l a little way over the point of the lifting 

 pallet in, but not fo clofe but that the point of the pallet may 

 pafs by the hooked end of the fpring EF without touching it; 

 the head of the adjufting fcrew mh alfo fuppofed to bear gently 

 on the inner fide of the faid fpring EF, or that neareft to the 

 wheel, and at the fame time the locking pallet is fo placed 

 that one of the teeth D, of the balance-wheel, may jtift take 

 hold of it. This pallet is not vifible in its proper place in the 

 figure, being covered from fight by the fcrew m, and part of the 

 fpring EF; its pofition is therefore reprefented by the dot k, on 

 the oppofite fide of the wheel, having the tooth A juft bearing 

 up againfi it. From the above delcription of the feveral parts of 

 the efcapement, and their connexion v^ith each other, it will 

 be eafy to fee the mode of its adion, which is as follows. 



A force being fuppofed to be applied to the balance-wheel j 

 fo as to caufe it to move round in the direction of the letter? 

 ABCD, one of the teeth, asD, will come up againft the locking 

 pallet (as reprefented al A, and the locking pallet by A). Th« 

 wheel is then faid to be locked, being prevented from moving 

 forward by this pin. Let the balance be now fuppofed t» 

 reft in its quiefcent pofition, and it v\ ill have the fituation re- 

 prefented in the figure ; the lifting point a, of the pallet m^ 

 will be juft clear of the projecting end of the flender fpring, 

 the fece hi of the large pallet MSK will fall a little below the 

 point of the tooth B, and the balance having its fpiral or helical 

 fpring applied to it (which is here fuppofed on the other fide of 

 the plate PQRS, and of caurfe not vifible in the jfigure) remains 

 perfectly at reft in this pofition. Now as the balance ULHV, 

 and the two pallets MSK and in, are fixed faft fo the verge, 

 it is plain they muft all move together ; let therefore the 

 balance be carried a little way round in the diredion of the 

 letters VULHj by this motion the end ? of the lifting pallet in 

 wiil be brought to prefs up againft the projecting end of the 

 ilender fpring, and as this fpring is fixed on the fide of the 

 fpring EF, neareft to the balance-wheel, the point i will prefs 

 "ihe two fprings together out from the balance-wheel; then, as 

 ©nly the point of the tooth D (fee its pofition at k) touches the 



locking 



