A CDE Definition
A rotating number selector on early telephones (and TVs). Introduced in the early 1900s, rotary phones were commonly used from the 1920s until the 1960s, when dial phones were gradually replaced with push button phones (see Touch-Tone).
In the Antique Shop
The dialing technology in an analog telephone. Each digit has a physical button that transmits a different audio tone when depressed. Known as the dual-tone multifrequency (DTMF) system, the signal is a combination of the row and column frequencies of the digit key.
The first touch-tone phones were installed in two Pennsylvania towns in the early 1960s. Digital phones do not use the Touch-Tone system. Contrast with rotary dial. See analog phone and digital phone.
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