The Traffic Signal Museum

Darley 3 bulb controller


Here is the controller found inside the 3 bulb Darley 4 way.

It uses a magnetic disk type motor. You can see part of the large disk in the picture below.

There are 4 cams behind the cam fingers you see here. Two of the fingers are for the yellow indication. 
The two yellow cams are wired together in the 3 bulb set up, but this controller could also be used in a 12 bulb set up by removing the wire between the two yellow cam fingers.

In the picture below, you can see the four cams and some of the gears as well.

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