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A mercury arc lamp from a fluorescence microscope. A krypton long arc lamp (top) is shown above a xenon flashtube. The two lamps, used for laser pumping, are very different in the shape of the electrodes, in particular, the cathode (on the left). An arc lamp or arc light is a lamp that produces light by an electric arc (also called a voltaic arc).
The lamp is a spark or electric arc through the air between two carbon rods. The rods must have a gap in between of the right size. If the gap is too big than the arc will flicker more or may go out, if the gap is to narrow than it will produce less light. The first carbon was made of charcoal (made from wood).
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Victorian cast iron lamp posts were once so common that the need for protection was easily overlooked. As a result, in many urban areas few survive. Standing on the edge of the pavement, the principal threat is from traffic, including delivery lorries and refuse-vehicles backing into them. Although brittle, the cast iron might not break, but the po...
Listing varies radically across the UK. A quick search for ‘lamp post’ in the National Heritage List for England reveals 400 entries for lamp posts, 88 of which are in or around Bristol. In Wales there are 29 list entries of which over half are in Llandudno. In Scotland, on the other hand, there are 800 list entries for lamp standards and holders. ...
D Cruikshank and N Burton, Life in the Georgian City, Penguin Group, London 1990 English Heritage, Practical Building Conservation: Metals, Ashgate, Farnham, 2012 T Fawcett, Paving, Lighting, Cleansing: Street improvement and maintenance in 18th-century Bath, Building of Bath Museum, Bath
Apr 23, 2016 · The city of San Jose, California, tried to solve the problem in 1881 by putting arc lights atop a 237-foot tall tower. A total of 6 arc lights were installed boasting a total light output of 24,000 candlepower. Inspired by San Jose, many American and European cities began putting up lighting towers. These came to be known as Moonlight Towers ...
Sep 7, 2021 · The Architectural Review An online and print magazine about international design. Since 1896. The history of the street light traces the course of political turbulence and the rise of capitalism. Street lighting might seem like a product of modernity, but there is little new about it. The Romans illuminated their city streets at night and ...
Nov 23, 2017 · Electric “arc” lighting refers to the fact that an electric spark in the air between two conductors will produce a dazzlingly bright light. Many early experimenters noted this phenomenon, and Sir Humphrey Davy made a famous demonstration of it in 1809. Some considered using the arc as a source of light for streets, theaters, or other spaces ...
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Arc lamp, device for producing light by maintaining an electric arc across a gap between two conductors; light comes from the heated ends of the conductors (usually carbon rods) as well as from the arc itself. Arc lamps are used in applications requiring great brightness, as in searchlights, large.
