Swimming Pools: Their Construction, Mechanical Installation, Water Supply; Heating the Water; Various Types of Installation. With More Than Thirty Illustrations and Charts (Google eBook)

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Domestic engineering, 1915 - Swimming pools - 60 pages
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Page 22 - In his address l>efore the International Medical Congress of Berlin, 1890, Koch states that the tubercle bacillus is killed by the action of direct sunlight in a time varying from a few minutes to several hours, depending upon the thickness of the layer exposed. Diffused daylight also has the same effect, although a considerably longer time of exposure is required when placed close to a window, from five to seven days.
Page 22 - Winds are active ventilating and purifying agents where population is congested. Fogs and clouds, by cutting off sunlight, weaken one of the best agents in promoting health, for the germicidal action of sunlight has been proved by many investigators.
Page 48 - It has been seen that a heat unit is the quantity of heat required to raise one pound of water one degree in temperature...
Page 22 - ... and 5 minutes exposure by the highest dilution of the phenol which gave the same result. Physical Agents of Disinfection. The following list enumerates the physical means of disinfection with the briefest comment as to their use and efficiency. (1) Sunlight is an active germicide. It destroys spores as well as bacteria. The blue-violet and ultra-violet rays possess germicidal power. (2) Ultra-Violet Rays kill spores and vegetative cells. (3) Electricity may kill germs either by thermal or...
Page 22 - Director of the Hygienic Laboratory of the United States Public Health and...
Page 54 - Fahr., and total heat of 12.843 pounds of steam, 12 355 heat-units, or 325.1 heat-units per actual square foot of surface, equaling 2.07 heat-units per square foot of surface per hour per degree of difference between steam and air. It is possible that should these radiators be transposed as to the buildings they...
Page 54 - B. tu per square foot of surface per hour per degree of difference between the mean temperature of the water and the temperature of the steam used to heat the water.
Page 59 - Insufficient water supply, openings for supply and escape too small, or inadequate facilities for heating so that an undue length of time is required to empty, clean and refill the pool with warm water.
Page 48 - From careful experiments it is found that one square foot of pipe, filled with steam and immersed in water, will condense 0.155 Ibs.
Page 59 - The selection of a bad location not infrequently in a basement in which the ventilation is inadequate and which is inaccessible to sunlight or even daylight.

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