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School Hygiene

School Hygiene


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About the Book

Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: CHAPTER III Artificial Illumination Of School-rooms Daylight is undoubtedly the light most suitable for the eyes; nevertheless, artificial illumination may sometimes become necessary in school-rooms. This happens most frequently in schools with two sessions in winter, when the first and last periods do not always have sufficient natural light. But even at other seasons dense mists, fogs, clouds, etc., may darken the room so that artificial illumination becomes a necessity. Boarding-schools must have it, at any rate. . The electric light ranks first among the different kinds of artificial light. It is white, and resembles daylight most closely leaving colors almost unchanged; it does not contaminate the .ajr iJtyyr.o.lveA aJaiQJt po risk of t T . . fire; and it carr bjp;c.irtveiffiertlJ''JiiirtCjct 'The flicker ing, which is so. disagreeable. tj tlae.aa en/account of the changes in'.iytc'nsity'has'wi'iijiijc'e'.of recent technical progress wholly disappeared in the incandescent, and almost wholly in the arc lamps. Even the plunge into sudden darkness due to the 1 Uber die Beleuchtung in einem Alumnat. Eulen- bergs Vierteljahrsschrift, 1879, Vol. XXXI, p. 63. stopping of the machinery is hardly to be feared any longer; and besides a storage battery may be kept constantly in readiness. Such batteries are particularly serviceable in places like schools where a current is needed on the instant and for a short time only. The arc light has, as is well known, great intensity and must be covered by ground glass globes, alabaster shades, or something similar. It might otherwise cause inflammation and swelling of the conjunctiva, and photophobia, with spasmodic contractions of the lids and narrowing of the pupils; also, hemeralopia, and possibly amaurosis. T...


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Product Details
  • ISBN-13: 9780217870481
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 88
  • Spine Width: 5 mm
  • Width: 189 mm
  • ISBN-10: 0217870481
  • Publisher Date: 19 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 172 gr


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