Abstract
AN address on illuminating engineering in the United States given by S. G. Hibben, the director of the Westinghouse Lamp Company, New York, has been published in the Illuminating Engineer of September, 1934. For underwater use, the Americans have developed special lamps. They have very strong bulbs, and both the base and the wires are wrapped in soft rubber which at great depths is highly com pressed. By their use, visibility is quite good at a depth of 400 ft. and photographs have been obtained at this depth. They are also used for salvage opera tions. Lamps at voltages which give them a life of about an hour only are used for photographic work. At still higher pressures we get the ‘photoflash’ lamp which is only used for instantaneous flashes. When used in a bulb of special blue-coloured glass, the blinding effect is negligible and the photographic effect is little impaired. In Europe, remarkable progress has been made in developing electric dis charge lamps. In the United States, sodium and mercury lamps are used; the latter is the more popular for interior lighting. The Statue of Liberty in New York Harbour is flood-lighted, the intensity of the illumination being 30 foot-candles. Golf courses are now being lighted and playing at night is proving popular. A few courses are lighted by filament lamps, the consumption being 5-10 kilowatts per hole. Steam and sailing yachts are sometimes flood-lighted, the canvas and the funnels being illuminated. As well as being decorative, this adds to their safety. One of the chief uses of ultra-violet energy is for the purification of liquids. By means of a cinema film, the purification of water by killing the bacteria with ultra-violet rays was shown.
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Illuminating Engineering in the United States. Nature 134, 490–491 (1934). https://doi.org/10.1038/134490d0
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DOI: https://doi.org/10.1038/134490d0