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Illumination and Photometry

Illumination and Photometry


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About the Book

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1910 edition. Excerpt: ...in expressing the true illuminating power and efficiency of an illuminant unless a definite form of light distribution and a definite reduction factor connecting this rating with the mean spherical intensity be understood. A rating based upon the mean lower hemispherical intensity would be of value only when applied to complete units, including the lamp and its accessories. The rating of illuminants in terms of the total lumens emitted or in terms of the mean spherical candlepower and of specific output in lumens per watt or mean spherical candles per watt may be commended as logical, accurate and fair. Types of light sources.--Incandescent electric lamps divide naturally into two classes. In the first of these classes the luminous element is an attenuated filament, mounted in an evacuated glass chamber and conducting current without electrolytic action. The second class is represented by the Nernst lamp, whose glower is a pyro-electrolyte, conducting only when hot, and unsuited to vacuum operation by its electrolytic action. Characteristics of lamp filaments.--The essential qualities of a lamp filament are (1) refractoriness, to permit its continuous operation at a high temperature; (2) high atomic weight in order that its rate of evaporation from the solid state may be as low as possible; (3) high electrical resistance, in order that the filament may be of reasonable length and cross-section to afford mechanical strength; (4) stable electrical resistance so that temperature changes may not cause fluctuations of the current; and (5) sufficient strength when mounted to withstand ordinary handling. Additional points of advantage are cheapness, possible uniformity of manufacture and selective emission favorable to the luminous spectrum....


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Product Details
  • ISBN-13: 9781152327429
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 48
  • Spine Width: 3 mm
  • Width: 189 mm
  • ISBN-10: 1152327429
  • Publisher Date: 01 Oct 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 104 gr


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