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  2. Photo-lab timer - Wikipedia

    en.wikipedia.org/wiki/Photo-lab_timer

    After specifying the exposure time, the supply of power to the enlarger is activated by pushing a start button, thus timing the exposure exactly. The selectable time range is typically from 1/10th of a second to one or more minutes. Most exposure timers also have a continuous light switch, which is especially helpful for framing and focusing.

  3. Garbage disposal unit - Wikipedia

    en.wikipedia.org/wiki/Garbage_disposal_unit

    A garbage disposal unit installed under a kitchen sink. A garbage disposal unit (also known as a waste disposal unit, food waste disposer (FWD), in-sink macerator, garbage disposer, or garburator) is a device, usually electrically powered, installed under a kitchen sink between the sink's drain and the trap.

  4. Float switch - Wikipedia

    en.wikipedia.org/wiki/Float_switch

    One type of float switch uses a mercury switch inside a hinged float. Another common type is a float that raises a rod to actuate a microswitch. One pattern uses a reed switch mounted in a tube; a float, containing a magnet, surrounds the tube and is guided by it. When the float raises the magnet to the reed switch, it closes.

  5. Push switch - Wikipedia

    en.wikipedia.org/wiki/Push_switch

    A push switch (button) is a momentary or non-latching switch which causes a temporary change in the state of an electrical circuit only while the switch is physically actuated. An automatic mechanism (i.e. a spring ) returns the switch to its default position immediately afterwards, restoring the initial circuit condition.

  6. Switch - Wikipedia

    en.wikipedia.org/wiki/Switch

    The most common type is a "push-to-make" (or normally-open or NO) switch, which makes contact when the button is pressed and breaks when the button is released. Each key of a computer keyboard, for example, is a normally-open "push-to-make" switch. A "push-to-break" (or normally-closed or NC) switch, on the other hand, breaks contact when the ...

  7. Push-button - Wikipedia

    en.wikipedia.org/wiki/Push-button

    A push-button (also spelled pushbutton) or simply button is a simple switch mechanism to control some aspect of a machine or a process. Buttons are typically made out of hard material, usually plastic or metal. [1] The surface is usually flat or shaped to accommodate the human finger or hand, so as to be easily depressed or pushed.

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