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  2. Dimmer - Wikipedia

    en.wikipedia.org/wiki/Dimmer

    When the dimmer is at 50% power, the switches are switching their highest voltage (>325 V in Europe) and the sudden surge of power causes the coils on the inductor to move, creating a buzzing sound associated with some types of dimmer; this same effect can be heard in the filaments of the incandescent lamps as "singing". The suppression ...

  3. DIP switch - Wikipedia

    en.wikipedia.org/wiki/DIP_switch

    US patent 3621157, filed in 1970 by Pierre Schwab, [1] is the earliest known DIP switch patent, which discloses a rotary style DIP switch. US patent 4012608, filed in 1975 by Joseph Lockard, [ 2 ] is a DIP switch with sliding levers, the modern DIP switch.

  4. Joel Spira (businessman) - Wikipedia

    en.wikipedia.org/wiki/Joel_Spira_(businessman)

    Joel Solon Spira (March 1, 1927 – April 8, 2015) was an American inventor, entrepreneur, and business magnate.. He invented a version of the light-dimmer switch for use in homes around the United States and led his Lutron Electronics Company into the production of lighting controllers.

  5. Rotary switch - Wikipedia

    en.wikipedia.org/wiki/Rotary_switch

    Thus a rotary switch provides greater pole and throw capabilities than simpler switches do. Rotary switches were used as channel selectors on television receivers until the early 1970s, as range selectors on electrical metering equipment, as band selectors on multi-band radios, etc. Modern rotary switches use a "star wheel" mechanism to provide ...

  6. Light switch - Wikipedia

    en.wikipedia.org/wiki/Light_switch

    Two light switches in one box. The switch on the right is a dimmer switch. The switch box is covered by a decorative plate. The first light switch employing "quick-break technology" was invented by John Henry Holmes in 1884 in the Shieldfield district of Newcastle upon Tyne. [1]

  7. Kliegl Brothers Universal Electric Stage Lighting Company

    en.wikipedia.org/wiki/Kliegl_Brothers_Universal...

    The company was also offering their "Dynabeam" lensed follow spot, and Fresnel lanterns ranging from 100 to 2000 watts. In that era of patch panels and small numbers of high wattage dimmers, Kliegl Brothers offered its "Safpatch" patch panels, and "Rotolector" rotary power switches, both developed by Herbert Kliegl.

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