1910] on the Telegraphy of Photographs, Wireless and hy Wire. 853 



battery leading to the relay K, as does also the centre seconds hand. 

 Therefore each time the brush wipes against a pin the circuit is closed, 

 and the relay throws into action the local circuit connected up with 

 the terminals T T. This circuit excites an electromagnet, which 



::^ 

 k 



k) 



attracts'an armature and pulls away the check which is holding back 

 the cylinder. At the end of each 5 seconds the cylinders consequently 

 recommence turning. 



Well calibrated clocks of the pattern used will keep good time for 



