CHAP, vi.] ELECTRIC HOROLOGY. G35 



passage of the electricity. The indicator of Garnier's regulator is 

 represented, in its essential features, in Fig. 415. An electro-magnet 

 attracts or repels (according as the current from the regulating clock 

 passes or is interrupted) an armature, M, which in turn raises the 

 lever LL by the rod t. One of the ends of this lever carries a catch, 

 c, which as it rises draws on by one tooth the ratchet-wheel R. Two 

 stops, b b', prevent the wheel, on the other hand, from turning through 

 more than one tooth, and from going back. When the current is 

 interrupted, the armature falls back on the screw which one of the 

 bobbins carries on its lower side, the lever LL is lowered, and the 

 catch c comes against the next tooth, which it stops until the passage 

 of the current energises the electro-magnet again. 



From the ratchet-wheel the motion is conveyed by properly-arranged 

 gear to the minute wheels which turn the hands on the dial. The 



FIG. 416. Telegraphic connection of the regulating clock with the indicators. 



regulating clock and the indicator being now regulated to agreement 

 once for all, this agreement continues as long as the battery works 

 with sufficient strength for the attraction of the armature. 



We must now see how a series of indicators is united to the regu- 

 lating clock, and how they are all able to go under the original 

 influence of the first, without an interruption of one of them inter- 

 fering with the others. 



Two large metal wires, AB, CD, leave the battery p after having 

 passed through the regulating clock H, as we have already shown. 

 From each of the wires run other pairs of wires at a&,- aft, &c., of smaller 

 diameter, communicating with each indicator, o, o', o", &c. By this 

 means the principal circuit is divided into as many derived circuits as 

 there are dials, and communicates the movement to each of these 

 independently, or we can connect the wires cd, c'd' with those of 

 one of the indicators, as o"' and o" with o". 



