. Water & sewage works . solution and conse-quently in small sized tanks, and prob-ably with better regulation of dosage,would not increase the hardness, but onthe contrary would decrease the lime sul-phate in the water, changing it to sodiumsulphate, thus improving the water forboiler use and for other industrial pur-poses. It also apparently helps to forma better protective coating on the pounds soda-ash per milliongallons of water are required for each carbonic acid. This would costabout 20 cents per million gallons foreach 1 carbonic acid. Soda-ashhas been us
. Water & sewage works . solution and conse-quently in small sized tanks, and prob-ably with better regulation of dosage,would not increase the hardness, but onthe contrary would decrease the lime sul-phate in the water, changing it to sodiumsulphate, thus improving the water forboiler use and for other industrial pur-poses. It also apparently helps to forma better protective coating on the pounds soda-ash per milliongallons of water are required for each carbonic acid. This would costabout 20 cents per million gallons foreach 1 carbonic acid. Soda-ashhas been used successfully on a smallscale to obviate red water trouble. Thegreat difference in cost Is due to greatermolecular weight, less combining power,and greater cost per pound. The costmust be considered in connection withthe degree and advantage of the changeof sulphates to carbonates, etc. Aeration of water by splashing followedby neutralization of residual free carbonicacid (about 5 ) is probably the ROOTS removed from of this character indi-cate clearly the necessity ofcleaning old sewers. Troubles likethis can be largely eliminated by care-ful construction of joints. October, ]91i Street Cleaning Department of Baltimore, Md. By STUART STEVENS SCOTT, Balrimore, Md. WITH a department as wellequipped as any in the country,Baltimore is ?winning fame as be-ing one of the cleanest of American cities,despite the handicap of having the repu-tation of having less smooth streets andmore cobble stones. The reputation of being a clean cityhas not been earned without hard worlion the part of the commissioner of streetcleaning, William , who, firstas district superin-tendent and now aschief, has put infourteen years. _ Dur-ing eleven years ofthis period ChiefLarkins carried outmany of his ownideas In his particu-lar district, winningthe commendation ofhis chief and havingthe satisfaction ofseeing his ideas putinto operation inother districts.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectsewerage, bookyear191
