. Water & sewage works . n of theburner is 3% to 4 amperes. If only alter-nating current is available, a rectifier isadded in order to convert the alternatingto direct current. Fig. 2 shows a much larger type of ster-ilizer, the water being agitated under thelight of a mercury vapor lamp, so as toturn any dust particles over and over, asthese might form an obstacle to the ac- 416 MUNICIPAL ENGINEERING tion of the rays on the microbes hiddenunderneath them. In order to make thesystem safe an electric connection ismade between the quartz lamp and anautomatic valve, so that should there beany acc
. Water & sewage works . n of theburner is 3% to 4 amperes. If only alter-nating current is available, a rectifier isadded in order to convert the alternatingto direct current. Fig. 2 shows a much larger type of ster-ilizer, the water being agitated under thelight of a mercury vapor lamp, so as toturn any dust particles over and over, asthese might form an obstacle to the ac- 416 MUNICIPAL ENGINEERING tion of the rays on the microbes hiddenunderneath them. In order to make thesystem safe an electric connection ismade between the quartz lamp and anautomatic valve, so that should there beany accidental interruption of currentthis automatic valve acts and preventsthe untreated water from entering themain containing the sterilized water. Several municipal water supplies inFrance are using large sterilizers such asthe one shown, which is made by J. Bertin & Co., of London, withmost satisfactory results. These plantsrepresent a total capacity of over ten mil-lion gallons per day, while the smaller. DIAGRAM of small violet-ray apparatus, showing ma-chine attached to tap to purify domestic icatcrsupply. sterilizer, shown In Fig. 1, made by thesame firm, is in operation in numeroushospitals and other private and indus-trial concerns. Many problems of modern hygiene aresolved by the use of perfectly sterilizedwater, and it is often desirable and neverdisadvantageous to retain the salts andgases which the water contains in solu-tion. The treatment described abovedoes not precipitate the soluble salts, andin no way modifies the physical andchemical qualities of the water treated,the only effect being that the noxiousgerms are destroyed. For the use of sur- geons, physicians, dentists and chemists,sterilized water is necessary, as by itsuse the need for antiseptics is reduced toa minimum. Industrially, water thus purified can beadvantageously employed for the manu-facture of beer, artificial ice, mineralwaters, and other commodities, while torwashing bottles which
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectsewerage, bookyear191
