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Fool In The Rain asked How does a rotary dial phone work?
The actual mechanisms of how it rotates and then spins bak to it's original position? I can't seem to find an answer anywhere!
And got the following answer:
It uses a spring to move it back. A cam opens and closes the switch as it rotates. wikipedia: To dial a number, the user puts a finger in the corresponding finger hole and rotates the dial clockwise until it reaches the finger stop. The user then pulls out their finger, and a spring in the dial returns it to the resting position. For example, if the user dials "6" on a North American telephone, as the dial returns, electrical contacts wired through the mechanism underneath will open and close six times, thus sending six pulses to the central office. Early dials worked by direct or forward action. The pulses went out as the dial went around to the finger stop. When the user's hand motion was not smooth, it produced wrong numbers. In the late 19th century the dial was refined to be operated by a recoil spring and centrifugal governor. The user selects the digit to be dialed, rotates the dial to the finger stop, then releases it. The spring causes the dial to return to its rest position and the governor regulates the dialing pulses at its design rate, usually approximately 10 per second, sometimes as much as 20 pps. The rotary dial governor is subject to wear and aging, and may require periodic cleaning, lubrication and adjustment by a telephone technician. The pulses are generated through the making and breaking of the telephone connection (akin to flicking a light switch on and off); the audible clicks are a side effect of this. As a result, all that is really needed to dial a number with pulse dialing is a switch. Each digit in the number is represented by a different number of rapid clicks. In most countries one click is used for the digit 1, two clicks for 2, and so on, with ten clicks for the digit 0; this makes the code unary, excepting the digit 0. Exceptions to this are New Zealand, with ten clicks for 0, nine clicks for 1, and so on; Sweden, with one click for 0, two clicks for 1, and so on; and in Oslo, the capital city of Norway, where the 'New Zealand' system was used in inverse to the rest of the country. Individual digits in a phone number need to be separated with a short pause so as not to bleed into each other (originally, to give the rotary relays at the exchange time to rotate) and in keypad based pulse dialing digits need to be "buffered" when dialed rapidly. In rotary systems this interdigit interval is provided by the slow rotation of the mechanical dial. .