Electric ARC Lamps; Their Principles, Construction and Working

Electric ARC Lamps; Their Principles, Construction and Working

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1908 edition. Excerpt: ... into Great Britain, has rapidly gained in popularity. Its warm, attractive glow has caused it to be much sought after for shop lighting, places of entertainment, etc. On account of the brilliant appearance of the lamp, a greater efficiency than the ordinary open type arc, and an excellent light distribution, it is being widely applied to lighting of large spaces, such as railway stations, engineering yards, parks, etc. The so-called "Sun-ray," or golden flame arc, has a fog-penetrating power, and thus renders it of special value for docks and harbours. The flame arc lamp is also being made available for interior illumination. B. FLAME ARC LAMPS WITH CO-AXIAL CARBONS. The flame arc lamp is simply an ordinary open type of arc lamp, but with certain modifications, and can be arranged to burn with direct or alternating current. Briefly, the modifications are--(a) Chemical carbons mineralized with certain metallic salts (or electrodes with a refractory conducting material other than carbon, see p. 13). (6) Suitable alteration in the striking mechanism, owing to working with a greater length of the flame arc than in the ordinary open type. The length of flame arc for a P.D. of 40 volts is about 15 to 16 mm., whilst the average length of arc in the ordinary open type for the same P.D. would be about 2 mm. (c) An economizer, consisting usually of an inverted fireclay bowl, fitted above the arc (Fig. 67). In order to obtain a light sufficiently steady for the requirements of exterior lighting, as little as possible of the carbon tip should be exposed to the arc, therefore carbons as thin as possible are employed. In the direct-current lamp the uppermost or positive carbon is made the same size as the negative. But since, under ordinary...show more

Product details

  • Paperback | 42 pages
  • 189 x 246 x 2mm | 95g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236540778
  • 9781236540775