<202 DESCRIPTION OF A NEW ESCAPEMENT. 



plies to fome obfervations which were made at the committee 



of the Society, which do not require to be dated here. 



Defcription of a p] ate XIV. exhibits the efcapemcnt, where the fame letters 



newefcaperaent. r ... ' . - . . , c 



Its parts. denote the lame things m all the figures. A is the icape- 



wheel, B a pallet lever on an arbor with fine pivots, having at 

 its lower end, Fig. 1 and 2, a remontoire, or fpiral fpring, C, 

 fixed with a collar and itud as pendulum fprings ufually are. 

 H H reprefents the balance, having upon its verge K K, a 

 pallet D, confiding of two arms, which carry a fmall roller 

 moveable on fine pivots ; and alio certain other pallets E, re- 

 prefented more fully in Fig. 4, the plan of which parts is feco 

 in Fig. 1, at E and D. F is an arm which ferves to move 

 two locking pallets a and b. It is continued beyond the cen- 

 ter of motion, in order that it may balance itfelf in all pofi- 

 tions, and at the part moft remote from the balance there are 

 a couple of finds and fcrews to adjuft and bank the quantity of 

 motion. The laft mentioned pallets have their faces, portions 

 of, circles, and they move on an arbor with fine pivots, as may 

 be feen at Fig. 2 and 4, in which figure alio it is to be ob- 

 ferved, that the arm of the locking pallets is formed into a 

 triple fork, the brandies of which are expofed to the action of 

 two pallets E before mentioned. 

 Performance of From the above defcription, and the confideration of the 

 the cfcapement. fjg ures lt w jjj ^ apprehended, that, fuppofing the maintain- 

 wheel winds up ing power to urge the wheel A forward, and the balance to 

 a lever and ^ f et m mot j on by external means, the lever pallet B will be 



fpnog j ana is . J . L 



caugh- ty a de- wound up to its pofition in Fig. 1. by the tooth 1 of the 

 tent. But the wheel, at which inilant the tooth 3 reits upon the pallet a, 

 fprin-* lever ren-^ u PP°^ e tne balance to move in the direction of the fmall ar- 

 ders the hoid of row near D, the verge pallet D will juft pafs the end of the 

 ceedinelvViht. ^ ever pallet B, at which moment one of the two unlocking 

 a. Tte balance pallets E will carry before it the arm F, and unlock the pal- 

 unlocks tne i et ^ anc j CO nfequently the wheel will drop with its tooth 4 

 go the fever, upon b t and the lever pallet B wilt be fet at liberty by the 

 and this Af.kes advance of the tooth 1, to act upon the balance by the pallet 

 balance arbc*. D> until B is flopped againft the tooth 2, as feen in Fig. 5. 

 3. In its return f$ v this means the balance receives the fame invariable im- 

 unlockTthe 8 P u ^ e at every fe£ 0I ?d vibration. In its return the oppofite 

 ,wheel, which unlocking pallet takes the other external arm of the fork of the 

 '^ in le ^ ds ( ^ 0t locking pallets, and by that means unlocks b. The wheel 

 1, 2, 3, Sec.) immediately drops forward, almoft through the fpace of one 



tooth, 



