NEW ESCAPEMENT. 137 



alternately; these are, at the proper intervals, unlocked by the New escape, 

 parts marked 2 and 3, fig. 1, upon the pendulum rod H, inter- «nent. 

 cepting small pins, a h, fig. 2, projecting from the detents, as 

 it vibrates towards the one or the other ; E is the renovating 

 or remontoire spring, fixed to the same stud F as the deients. 

 It is wound up by the highest tooth of the wheel, as seen in 

 fig. 1, (its position when unwound being shown by the dotted 

 line.) This being the case, suppose a tooth of the wheel is 

 caught by the detent D, which prevents the wheel from mov- 

 ing any further, and keeps the renovating spring from escaping 

 off the point of the tooth : in this position, the pendulum is 

 quite detached from the wheel ; now, if the pendulum be 

 caused to vibrate towards G, the part of it marked 2, comes 

 against the pin b, fig. 2, projecting from the renovating spring 

 E, and pushes this spring from the point of the wheel's tooth; 

 on vibrating a liitle farther it removes the detent D, which 

 detained the wheel by the part 3 striking the pin (a, fig. 2) 

 which projects from the detent ; the maintaining power of 

 the clock causes the wheel (thus unlocked) to advance, until 

 detained by a tooth resting upon the end of the detent C, on 

 the opposite side ; by this means, the renovating spring will be 

 clear of the tooth of ihe wheel as it returns with the pendulum, 

 and gives it an impulse, by its pin b, pressing against the part 2 of 

 the pendulum, until the spring comes to the position shown by 

 the dotted line; in which position it is unwound, and rests against 

 a pin fixed in the cross-bar of the plate ; the pendulum conti- 

 nues vibrating towards I, nearly to the extent of its vibration, 

 when the part 1 meets the pin in the detent C, and removes 

 it from the wheel and unlocks it ; the maintaining power now 

 carries it forward, pushing the renovating spring E before it, 

 until another tooth is caught by the detent D, which detains 

 the wheel in the position first described, the renovating spring 

 being wound up, ready to give another impulse to the pendu- 

 lum. 



N. B. The pin b, fig. 2, is not fixed to the renovating spring 

 itself, but is part of a piece of brass, which is screwed fast to 

 the renovating spring, and is made very slender near the screw 

 which fastens it ; this permits the end of the renovating spring 

 to give way, ifj by the weight being taken off the clock, or 



any 



