SEISMOMETEY. 



39 



mechanism, forming part of a time-keeper, which causes 

 the dial of the timepiece to come suddenly forwards on 

 the hands and then move back to its original position. 



Fig. 8. 



The hands are provided with ink-pads, which mark their 

 positions on the dial, thus indicating the hour, minute, 

 and second when the circuit was closed. The second 



