TIME KEEPERS* 421 



U'hich Is made faft at one end, by being pinned into a ftttd, G, Defcnption of . 

 and made to bear gently againft the head of an adjulVing fcrew (,f\ij.^'^£a„,^'^ 

 "Wt; the other end is bent a little into the form of a hook ; to this /haw's time 

 fpring there is fixed another very flender (pring at 7, which P'^"' 

 projects to a fmall diftance beyond it. This fmall fpring lies 

 on the fide of the thick fpring ne'areft to the balance-wheel; 

 The adjufting fcrew, in, takes into a fmall brafs-cock, a p> 

 which is fcrewed faft to the plate PQRS by a ftrong fcrew at , 



p. Upon the fpring EF there is fixed a femi-cylindrical pin> "^ 



which ftands lip perpendicular upon it, and of a fuflicient 

 length to fall between the teeth of the balance-wheel ABCDi 

 This pin is called the locking-pallet, and is placed on the 

 oppofite fide of the fpring reprefented to view. Through 

 the center of the cylindrical pallet MSK, a ftrotig fteel axis 

 paffes called the verge; the pallet is made faft to this axisj 

 which ilfo pafles through the center of the balancCj and is 

 made faft to it; it has t^Vo fine pivots lit its extremiliesj upon 

 which it turns very freely, between two firm fuppOrting pieces ] 



df brafs fcrewed firmly, and made as permanent as poflible, 

 by fteady pins to the principal plate PQRS ; one of (hefe 

 pieces is reprefented in the figure hy w y L; the part zy is 

 railed above the part j/ L by a bend or joint at n ; the part y L 

 being reprefented as fixed firm to the plate by the ftrong fcre\xr 

 at^. This piece is called the potence, and is exactly fimilar 

 to the other fupporting piece, which is called the cock, that 

 fs timilarly fixed to the oppofite fide of the plate and hid from 

 the fight in the figure; A little above the cylindrical pallet 

 MSK (as it appeal's in the figure) is fixed a fmall cylindrical 

 piece of fieel in, having a fmall part projeding out at i, 

 throilgh which the verge alfo palfes; this is called the lifting 

 pallet ; it fixes Upon the verge like a collar, and is made faft 

 by a twift, fo as to be fet in any pofition with refpefl to the 

 large pallet MSK. The balance lying below the plate PQRS, 

 only the part UV is reprefented to view; the continuation of 

 the pofition of the circumference^ however, is reprefented 

 by the dotted linfes ULHV. The end EG of the long fpring 

 EF being made very flender, if a fmall force be applied at the 

 point to prefs that end out from the wheel ABCD, it eafily 

 yields in that diredion, turning as it were upon a center at Gj 

 U is alfo made to Hide in a groove made in this ftud in fuch sL 

 manner that the end o may be placed at any required diftande 

 Vol. Xill.— "Sufri-BMENT. . Gg frvm 



