push-button dialing

References

Images

On the left, a hand dials a number on a green rotary phone above a graph showing pulses (interruptions in DC current) that represent the phone being dialed. On the right, a hand presses a button on a red tone-dial phone above a representation of a push-button pad showing frequencies corresponding to each button.

Evolution of the Phone: A look at telephone technology through the decades.

push-button dialing

telephones

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The Information Architects of Encyclopaedia Britannica

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telephone
Push-button dialing
In the 1950s, after conducting extensive studies, AT&T concluded that push-button dialing was about twice as efficient as rotary dialing. Trials had already been conducted of special telephone instruments that incorporated mechanically vibrating reeds, but in 1963 an electronic push-button system, known as…
Read More
In the 1950s, after conducting extensive studies, AT&T concluded that push-button dialing was about twice as efficient as rotary dialing. Trials had already been conducted of special telephone instruments that incorporated mechanically vibrating reeds, but in 1963 an electronic push-button system, known as…
Read More