. Public health and preventive medicine. enic point of view, electric light is the best, asit has none of the disadvantages of the other forms of lighting. It does WATER SUPPLY 33i not vitiate the air, deprive it of oxy-gen, nor yield to it carbonic acid, wateryvapour, or much heat, while it is clean,and tides not discolour walls or may be necessary to moderate the inten-sity of the light, which is often trying tothe eyesight. An electrically lighted townis, caeteris paribus, a more hygienic townthan one lit with gas, since a large con-sumption of gas contributes to the pro-duction
. Public health and preventive medicine. enic point of view, electric light is the best, asit has none of the disadvantages of the other forms of lighting. It does WATER SUPPLY 33i not vitiate the air, deprive it of oxy-gen, nor yield to it carbonic acid, wateryvapour, or much heat, while it is clean,and tides not discolour walls or may be necessary to moderate the inten-sity of the light, which is often trying tothe eyesight. An electrically lighted townis, caeteris paribus, a more hygienic townthan one lit with gas, since a large con-sumption of gas contributes to the pro-duction of foul air and fog. LIGHTING AND VENTILATIONCOMBINED. As already seen, gas light may be ad-vantageously employed to assist extraction inthe form of a sunlight, etc. This method,in the form of the ventilating globe light(Fig. 115), is Avell adapted to and oil lamps are feeble aids toventilation, produce much heat, and sorequire that allowance be made for themin the ventilation of a room in which they are employed. Fig 115.—Ventilating globe light, a,Fresh air inlet, b, Exit of foul airfrom room, c, Combustion productoutlet. </, Burner. IV. THE COLLECTION AND DISTRIBUTION OF A PUREWATER SUPPLY. OF INDIVIDUAL BUILDING. A single house may derive its water from (A) a private, or (B) a publicsource. If the former, rain, wells, springs, rivers, and streams, ponds orlakes, may form the supply. A. (a) Rain.—A house deriving its water supply from rain must havea collecting surface, means of transit, and methods for storage, filtration, anddistribution. 1. Collecting surface.—This should be clean so as not to contaminate thewater, and should yield nothing injurious to the water. Further, it should beimpervious, easily accessible, easily cleaned, and so placed that the water mayreach the house by gravitation. The following materials are in common use,slates, tiles, stone slabs, stone or iron tanks, concrete, cement, and corrugatediron or zinc. The roof is
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectprevent, bookyear1902
