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THE POPULAR SCIENCE MONTHLY. 



spring against its contact-screw, and the signal goes out over each of 

 the lines. 



The synchronizer is the receiver of the signal, and consists essen- 

 tially of an electro-magnet, in the circuit of one or other of the lines 

 from the distributor, with armature carrying two counterpoised levers 



Fig. 12. The Synchronizer. 



