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  2. Rotary dial - Wikipedia

    en.wikipedia.org/wiki/Rotary_dial

    A 1931 Ericsson rotary dial telephone without lettering on the finger wheel, typical of European telephones. The 0 precedes 1. A rotary dial typically features a circular construction. The shaft that actuates the mechanical switching mechanism is driven by the finger wheel, a disk that has ten finger holes aligned close to the circumference.

  3. Telephone keypad - Wikipedia

    en.wikipedia.org/wiki/Telephone_keypad

    Telephone with letters on its rotary dial (1950s, UK) The layout of the digit keys is different from that commonly appearing on calculators and numeric keypads.This layout was chosen after extensive human factors testing at Bell Labs.

  4. Trimline telephone - Wikipedia

    en.wikipedia.org/wiki/Trimline_telephone

    A 220 Trimline rotary desk phone, showing the innovative rotary dial with moving fingerstop Early Touch Tone Trimline with round buttons and clear plastic backplate and round non-modular handset cord Redesigned touch-tone desk model Trimline, manufactured on January 9, 1985 The Trimline 2225, one of the last phones made at the Indianapolis Works in 1986 Early foreign made Trimline, December ...

  5. Strowger switch - Wikipedia

    en.wikipedia.org/wiki/Strowger_switch

    The telegraph keys or telephone dial creates trains of on-off current pulses corresponding to the digits 1–9, and 0 (which sends 10 pulses). This equipment originally consisted of two telegraph keys engaged by knife switches, and evolved into the rotary dial telephone. The central office switching equipment has a two-motion stepping switch. A ...

  6. 1A2 Key Telephone System - Wikipedia

    en.wikipedia.org/wiki/1A2_Key_Telephone_System

    Telephone sets could be either rotary dial models, or be equipped with Touch-Tone keypads. A power supply was either mounted within the panel or separately nearby. The power supply provided 24 VDC for relay operation, filtered 24 VDC for talk battery (intercom and direct-line services), 10 VAC for lamps, 18 VAC for buzzers, and 90–110 VAC at ...

  7. Lineman's handset - Wikipedia

    en.wikipedia.org/wiki/Lineman's_handset

    Originally, lineman's handsets featured a rotary dial, but modern sets use some variant of the standard 12-button DTMF keypad and also employ an amplifier for speaker use. Most handsets are designed to be used with analog "POTS" lines, and have limited or no function with digital circuits. Older telephone linemen also referred to the handset as ...

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