Show the purification of drinking drinkins Drin kinq water k direct of a 0 matet for drinking Is given in a report by 04 aige N johnson just b the united states geological sun avrie e 1 in report describes the various types of 0 gatei supply systems used b cities ln lit the united limited states stales apts acts foith the advantages and dt disadvantages td an ages of inch and gives ives a brief history of the envelopment of systems and the effect of their installation insinuation on the health of the necessity nece salty of purifying water for i iso aft in cities Is r leibly shown not he least important alue of water vater being the it pi 01 ides against disease nir mr john son ion i on show a hy by very reasonable mates tant the use UBO of pure water annu annuala all sales front from the invades of anter antei horne bortle fr n lono more than four units the cost of purify ing tile the water anter the ilie substitution of pure loi joi impure bator ator supplies in the united stat baates mould MHO some 26 lacfi an annl full bulb taw 0 thio paper include ti a historical sketch of modes oi 01 a tein tents of wal ter ler foin flout the storage works and by aluin used ly by the ancient chinese to the present lay day methods nieth of coagula conf rula tion and sterilization treatment in ahlich the water la IN passed through sedimentation tank coagulation basins or roughing fil lem to remote a portion of its color or turbidity Is discussed in detail ln in slow sand water Is IB passed slowly through grent tede beds of tine fine sand ott on which it leaves its impurities in puri ties illustrations of several successful slow sand filtration plants pla iro ire glan and special features of sand handling sandow fiand tun ing and operation are explained and disc dl sued umed the cost of construction annd mallit nial nten enLace aice and operation are sho W detail for foran a number of planta of this type the report albo de albes ilat il bt and illustrates lit in a manner rapid avind filters which dir for or from alo sand chiefly lit in being constructed in smaller tima hor and of coarser sand band in always hall hai ink ing coagulation ut as it a lit in being operated about fort its as last fast and in beilig cleaned by sending a reverse current or of water the filters mc soften nott ening ln of municipal water supplies in connection with mith their la Is discus and the ibo nd ad antwi an and anci its ag well f 1114 the details of this treatment are set forth in detail ilard hard na a teis produce prodico swale lit in and ill ortell the life of boilers causing waste or of coal aey nrc are III suited to the neld of mall indus tilea and muse cause enormous maste of saip in and in 01 oi dinar donl estl operations lit in instances the of soup soap Is IB alono alone sufficient to PI tile flip costs of softening in this thia report te hillal tarnia have been folded not del so no far as pon sible n tit alio llio auh ct Is IH presented ted to bo clench and on clely that it ran call ito ho b Is UK the nom lion technical iet ieter lr it contains duill of balue allue to cit officials boards of health and others in od ed tit in san itar engineering as applied to matei works plat ining maleat nanee nance and operating it tri is as paper ind euid it a copy an be obtained free of charle charge on oil appi leation alon to tho the Dire director ctol united geological survey 1 D C |