A manual of hygiene for students and nurses.

  • Glaister, John, 1856-1932.
Date:
1897
Catalogue details

Licence: Public Domain Mark

Credit: A manual of hygiene for students and nurses. Source: Wellcome Collection.

Provider: This material has been provided by University of Bristol Library. The original may be consulted at University of Bristol Library.

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    organisms. The second class is composed chiefly of the gaseous products of combustion and of chemical works —these being mainly compounds of ammonia and sulphur of different chemical compositions. Hundreds of thousands of tons of these gases are computed to be given off annually into the atmospheres of large cities. Carbonic acid gas is also largely increased in these circumstances. In foggy weather, in Manchester, London, or Glasgow, this gas may be increased from four to seven parts per 10,000 of air. The air of a populous place is, therefore, notably more impure than that of the open country or the sea. In like manner the air of an occupied room becomes impure by increase of carbonic acid gas, watery vapour, and organic matter. In schools, for example, this gas may be found present from five to ten times more plentifully than in pure air, and organic matter twenty times more. SPACE IN REFERENCE TO AIR SUPPLY. By superficial space is meant space multiplied into two dimensions, vk., the length by the breadth ; by cubic space, into three dimensions, viz., length by breadth by height, or thickness. Feet multipHed by feet equals square feet, and feet x feet x feet equals cubic feet. Both measurements are of great importance in reference to air supply, the one as much as the other. Superficial space in reference to a room is often called floor-space or floorage. The cubic space of a room is obtained by multiplying the length by the breadth, and the product by the height. In considering the dimensions of any room in reference to ventilation, regard must be had to each dimension. This is true of