Lessons in Practical Hygiene for Use in Schools - Bookswagon
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Lessons in Practical Hygiene for Use in Schools

Lessons in Practical Hygiene for Use in Schools


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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.1907 Excerpt: ... Note.--Professor Nussbaum has carried out a series of observations, extending over several years, into the character of the dust deposited on the pipes used for the distribution of hot water or steam, and into the products of decomposition of such dust. He found that when the temperature reaches 70 C. (158 F.) this dust begins to decompose, and that between 75 C. (167 F.) and 80 C. (176 F.) such action goes forward with great rapidity. The smell complained of resembled that of a stable, and is due to the chemical action of the particles of organic matter which form a large proportion of the dust deposited in dwellings and public.buildings. In the course of certain experiments ammonia was freely evolved from the dust when the temperature rose to 80 C. (176 F.). It had been previously observed that the smell was always worse when the heating apparatus was used after a long interval of rest; when the cause had been discovered and the dust was first carefully cleared away the smell partly disappeared, though some smell, due to floating dust in the atmosphere, remained. When the surface of the pipes is damp, decomposition takes place at lower temperatures than when the dust is perfectly dry. XXYIII.--LIGHTING. NATURAL AND ARTIFICIAL. Elementary study of vision and optics. Comparative intensity of reflected light. Passage of light through different media. Principles of combustion as they affect illumination and some sources of artificial light. The size and position of windows. Relationship of height of buildings to width of streets. I.--Elementary Study of Vision and Optics. Repeat " The Eye," XIII., I. (A), V. (A) (B) (F) ((?), and "The Care Of The Person," IV., (A) "The Eyes," pages 483-86. Note.--(1) The provision made for the protection of the eyes. (2) The ...


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Product Details
  • ISBN-13: 9781150852510
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 222
  • Spine Width: 12 mm
  • Width: 189 mm
  • ISBN-10: 1150852518
  • Publisher Date: 01 Feb 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 404 gr


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