Mechanical Contracting & Plumbing January-December 1908 . , the Red Bank effluent wasquite clear and free from suspendedmatter, while that from Plainfield con-tained more of such suspended materialthan one expects to see in a good tankeffluent. The analyses of the sewage arenot dissimilar, and no reason can befound for the difference, unless it be thefact that the tank mentioned first, hav-ing a diameter of 43 feet, has a meanvelocity through it of 86 feet a day, andthe maximum velocity is not over 100feet ; the other tank is 100 feet long, sothat the velocity is over 200 feet perday. DAWSONS
Mechanical Contracting & Plumbing January-December 1908 . , the Red Bank effluent wasquite clear and free from suspendedmatter, while that from Plainfield con-tained more of such suspended materialthan one expects to see in a good tankeffluent. The analyses of the sewage arenot dissimilar, and no reason can befound for the difference, unless it be thefact that the tank mentioned first, hav-ing a diameter of 43 feet, has a meanvelocity through it of 86 feet a day, andthe maximum velocity is not over 100feet ; the other tank is 100 feet long, sothat the velocity is over 200 feet perday. DAWSONS WARM WATER SUPPLY Warming the town water supply iswhat has to be done at Dawson, in theYukon Territory. The ground is frozenthroughout the year, except for the toptwo or three feet during the summer,and consequently the water in themains would freeze were not some meanstaken to prevent it. This preventiveconsists of turning exhaust steam fromthe pumps and extra steam from theboilers into the supply, which is there-by warmed sufficiently for the PLUMBER AND STEAMFITTER March 11, 1908 Evolution of House Ventilation The Third Article By E. D. Sidman in Building Management. The importance of veiitilation forall classes of buildings is so well knownthat it seems unnecessary for us to sayanything further on that point, exceptto emphasize the fact that the valueof pure air and the proper amount ofhumidity cannot be overestimated. Aperson can live without food or waterfor se^eral days but deprive him ofair for even a few minutes and he isdead. But there is too great a ten-dency, even among those who considerthemselves enlightened, and otherswho admit the value and necessity ofventilation, to shut out this vital ele-ment in its pure state from their build-ings, either because, as Benjamin Frank-liri once said in a letter, Some peopleare as much afraid of fresh air as per-sons with hydrophobia are of fresh wa-ter, or they have an idea that ven-tilation is an apparatus expensive
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