Gas Supply in Principles and Practice. a Simple Guide for the Gas Fitter and Gas Consumer
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Gas Supply in Principles and Practice. a Simple Guide for the Gas Fitter and Gas Consumer

Gas Supply in Principles and Practice. a Simple Guide for the Gas Fitter and Gas Consumer


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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. 1914 edition. Excerpt: ...be 2-5 candle power per square inch. The luminous intensity of the inverted lamp is 120 candle-power. Of this radiation a ground glass globe will stop 25 per cent., leaving 90 c.p. to pass. To soften this intensity to the 90 required figure will need a shade of = 36 square 2-5 inches of visible plane superficies; which will be provided approximately by a 7in. globe. Of course, the apartment generally would be adequately lighted as well. Notwithstanding the apparent loss of light due to absorption by the material of the shade, the useful illumination of any object in the immediate vicinity of such a shaded light will be greater than if the bare mantle or a mantle behind clear glass were employed; by reason of the increased perceptive power of the eye in consequence of the larger opening of the iris. note.--The subject of " Shades and Reflectors" is treated comprehensively by Messrs. J. G. Clark and V. H. Mackinney, in a paper published in "The Illuminating Engineer" for March, 1913. Shop Lighting. There is much scope for both science and art in the lighting of shops, warerooms, and commercial interiors generally. Shop-front and window lighting is a study in itself. The first point to be noted in any such application is the particular kind of effect required to be produced; which usually depends upon the class of business in the case. After this comes the amount or scale of the illumination desired, whether for actual use, or for display and trade rivalry. Not all shopkeepers seek a brilliant lighting scheme. In certain lines of business there is more attractiveness in a quiet, reposeful scale of illumination; which need not look poverty-stricken. Old furniture, ancient houses of call, and so forth offer scope for...


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Product Details
  • ISBN-13: 9781152256613
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 58
  • Spine Width: 3 mm
  • Width: 189 mm
  • ISBN-10: 1152256610
  • Publisher Date: 01 Oct 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 122 gr


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