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  2. Rotary dial - Wikipedia

    en.wikipedia.org/wiki/Rotary_dial

    The rotary dial governor is subject to wear and aging, and may require periodic cleaning, lubrication and adjustment by a technician. In the video, the green LED shows the dial impulse pulses and the red LED shows the dial's off-normal contact function. Off-normal contacts typically serve two additional functions.

  3. Rotary system - Wikipedia

    en.wikipedia.org/wiki/Rotary_system

    The rotary machine switching system, or most commonly known as the rotary system, was a type of automatic telephone exchange manufactured and used primarily in Europe from the 1910s. The system was developed and tested by AT&T's American engineering division, Western Electric , in the United States, at the same time when Western Electric was ...

  4. Rotary switch - Wikipedia

    en.wikipedia.org/wiki/Rotary_switch

    A rotary switch is a switch operated by rotation. These are often chosen when more than 2 positions are needed, such as a three-speed fan or a CB radio with multiple frequencies of reception or "channels". A rotary switch consists of a spindle or "rotor" that has a contact arm or "spoke" which projects from its surface like a cam.

  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. Manettino dial - Wikipedia

    en.wikipedia.org/wiki/Manettino_dial

    Ferrari F430 steering wheel with manettino switch. In automotive engineering, a manettino dial is a rotary switch part of some modern Ferrari cars first designed by Frank Stephenson, [1] beginning with the Ferrari F430 in 2004. The adjustment dial is mounted on the steering wheel, usually just underneath the center of the wheel.

  7. Switch - Wikipedia

    en.wikipedia.org/wiki/Switch

    A simple on-off switch: The two terminals are either connected together or disconnected from each other. An example is a light switch. SPST-NO. Form A [4] Single pole, single throw, normally open A simple on-off switch. The two terminals are normally disconnected (open) and are closed when the switch is activated. An example is a pushbutton ...

  8. Control knob - Wikipedia

    en.wikipedia.org/wiki/Control_knob

    Two control knobs for a heating/cooling system. The left knob controls the temperature while the right controls the fan speed. A control knob is a rotary device used to provide manual input adjustments to a mechanical/electrical system when grasped and turned by a human operator, so that differing extent of knob rotation corresponds to different desired input.

  9. Rotary encoder - Wikipedia

    en.wikipedia.org/wiki/Rotary_encoder

    A rotary encoder, also called a shaft encoder, is an electro-mechanical device that converts the angular position or motion of a shaft or axle to analog or digital output signals. [1] There are two main types of rotary encoder: absolute and incremental. The output of an absolute encoder indicates the current shaft position, making it an angle ...