XI. TIME. 



1)5 



Fig. 3. The pallet against 

 the second detent. 



Fig. 4. The pallet at its 

 lowest position. 



back through 0, the detent F being out of the way, as far as the detent G 

 (here see Fig. 3), -where it stops. In this fall through /3, C gives the impulse. 

 The pendulum now moves on by itself, until presently the pin in its rod 

 once more lifts G, not however idly now, but releasing C, which falling back 

 further through a + to its lowest position (shown in Fig. 4), unlocks the 

 scape wheel from H. The position of H with respect to that part of C which 

 acts upon it is shown in plan in Figs 3a and 4a, in Fig. 3a just before, and in 

 Fig. 4a just after the unlocking of the scape wheel. The pendulum having 

 lifted G, continues its swing to the extreme left, whence it was supposed 

 started. The scape wheel, free to move, lifts C and also E, the detent F > 

 which is weighted so as to rise of itself, following E's motion, and being in 

 position to hold C when the lifting is done, which is the case just before the 

 next long tooth of the scape wheel coming round and setting against H 

 (which returned to its normal position as C in lifting cleared it), things are 

 again as represented in Fig. 1. 



It will be seen from the above description that the pendulum is never in 

 connexion with the clock train, not even for unlocking, and is therefore ex- 

 posed to no inequality whatever in the work it has to do. The pressure of 

 the scape wheel against the stop by which it is locked varies. This variation, 

 however, is altogether apart from the pendulum, as the unlocking is done by 

 the pallet. 



In the arrangement drawn the impulse is not given across the line of 

 centres ; it can, however, be so given by appropriate modifications of the 

 various parts. 



