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3 PC antique Vitreous Brand Black Ceramic & Bakelite Electric Switches , England

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Seller: great_art999 (30) 100%, Location: AHMEDABAD, GUJARAT, Ships to: Worldwide, Item: 182367887167 3 PC antique Vitreous Brand Black Ceramic & Bakelite Electric Switches , EnglandSIZE 5 CMSThe first light switch employing "quick-break technology" was invented by John Henry Holmes in 1884 in the Shieldfield district of Newcastle upon Tyne.[1] The "quick-break" switch overcame the problem of a switch's contacts developing electric arcing whenever the circuit was opened or closed. Arcing would cause pitting on one contact and the build-up of residue on the other, and the switch's useful life would be diminished. Holmes' invention ensured that the contacts would separate or come together very quickly, however much or little pressure was exerted by the user on the switch actuator. The action of this "quick break" mechanism meant that there was insufficient time for an arc to form, and the switch would thus have a long working life. This "quick break" technology is still in use in almost every ordinary light switch in the world today, numbering in the billions, as well as in many other forms of electric switch.The toggle light switch was invented in 1917 by William J. Newton.[2]As a component of a building wiring system, the installation of light switches will be regulated by some authority concerned with safety and standards. In different countries the standard dimensions of the wall mounting hardware (boxes, plates etc.) may differ. Since the face-plates used must cover this hardware, these standards determine the minimum sizes of all wall mounted equipment. Hence, the shape and size of the boxes and face-plates, as well as what is integrated, varies from country to country.The dimensions, mechanical designs, and even the general appearance of light switches changes but slowly with time. They frequently remain in service for many decades, often being changed only when a portion of a house is rewired. It is not unusual to see century-old light switches still in functional use. Manufacturers introduce various new forms and styles, but for the most part decoration and fashion concerns are limited to the face-plates or wall-plates. Even the "modern" dimmer switch with knob is at least four decades old, and in even the newest construction the familiar toggle and rocker switch appearances predominate.Orientation[edit]The direction which represents "on" also varies by country. In the US and Canada, it is usual for the "on" position of a toggle switch to be "up", whereas in many other countries such as the UK, Ireland, Australia, and New Zealand it is "down". In multiway switching, the correspondence between a single switch's state and whether lights are on or off depends on other switches in the circuit.I offer a combine shipping discount 10% for each additional item. Please request me for total invoice when you've finished the last item you want to buy or make a payment for all of your items in one time. I accept PAY pal only. we are only give 10% discount combing shipping please not request more discount thanks Item will ship within 2-3 day after payment. You will receive an email once shipped. Payment must be made within 3 days after the auction ends. If you have any problems or questions, please feel free to contact me. I'll do my best to help you. Please contact me before leaving negative or neutral feedback, giving me a chance to resolve your problem. Thank you for your interested in my product.

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