. Preventive medicine and hygiene. ofpossible sources of pollution. The casing of the well should be soundand tight, preferably of brick laid in cement mortar, pointed on tlieinside. This impervious casing should extend as deeply into the wellas practicable, and after it is laid the outer space between the casingand the earth should be filled in with well-tamped clay soil or of the most important points in the construction of a shallow wellis to extend the casing at least 18 inches above the surface of theground and to build around it a shield of concrete or brick laid in cementex
. Preventive medicine and hygiene. ofpossible sources of pollution. The casing of the well should be soundand tight, preferably of brick laid in cement mortar, pointed on tlieinside. This impervious casing should extend as deeply into the wellas practicable, and after it is laid the outer space between the casingand the earth should be filled in with well-tamped clay soil or of the most important points in the construction of a shallow wellis to extend the casing at least 18 inches above the surface of theground and to build around it a shield of concrete or brick laid in cementextending in a circle from the top of the well 3 or 1 feet wide. This. Fig. 99.—Proper Construction of a Well. ^The word artesian is derived from Artois. an ancient province in Francewhich was supplied with flowing wells. SOUECES OP WATEK 813 shield should join the well casing so as to make a tight joint with the cas-ing. The floor of the well should rest upon the top of the casing, so thatno space is left for frogs, mice, or bugs to crawl in. The floor shouldlikewise be water-tight, and is best made of reinforced concrete with acement surface. If this is not practicable, it should be made of sound,hard, tongue-and-grooved boards well driven up, and the edges paintedwith white lead. Upon this should be laid another floor of similarmaterial at right angles to the first. The pump should be let into thefloor and firmly fastened to it, and protected with a flashing of tin toprevent water washing back into the well.
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Keywords: ., bookauthorwh, bookcentury1900, bookdecade1910, booksubjecthygiene
