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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 essentially of an electro-magnet, in the circuit of one or other of the lines from the distributor, with armature carrying two counterpoised levers
![](http://upload.wikimedia.org/wikipedia/commons/thumb/b/b4/PSM_V22_D352_Time_synchronizer_mechanism.jpg/372px-PSM_V22_D352_Time_synchronizer_mechanism.jpg)
Fig. 12.—The Synchronizer.