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anthony asked how does a mechanical controller change a traffic light?
was rather curious, since I remember I heard those change the lights when i stood next to one.
And got the following answer:
Most electro-mechanical signal controllers were mainly composed of movable parts, such as dials, cams, and shafts, that were responsible to change signal indications correctly. Others had actual electrical relays on the other hand. Although, for the most part, many of these older signal controllers were typically composed of movable parts. When you think about it, when the movable parts in an electro-mechanical signal controller work together as one, they all act as one large electrical relay, since most of the parts practically share the same concepts to that of electrical relays. In an electro-mechanical signal controller, two things happen when it changes an indication of a traffic signal. First, a dial key (located in a dial timer) hits a contact point above it, which, in turn, creates an electrical current. This electrical current then is sent from the contact point to the solenoid and ratchet motor. Once energized, the solenoid and ratchet motor (together) change the positions of a set of cams that are located on a shaft. Second, the cam that corresponds to the particular signal indication that is changed either opens or closes a contact finger below it. In open position, the corresponding signal indication is unlit. In closed position, the corresponding signal indication is lit. The "KER-CHUNK" or "BUZZ-CLUNK" is the ratchet motor and solenoid that are both electrically charged to change a signal indication. Electro-mechanical signal controllers that had used actual electrical relays were somewhat different. Although not completely different altogether. The only difference here was that the electrical relay was actually changed the cams. No solenoid or ratchet motor was present.