Engineering and Contracting . o great obstacles in the way of developingit to the point of equality with the best gravity filters asregards efliciency and reliability, for any capacity and formost waters. (3) It is better adapted to the treatmentof some waters than the gravity filter. (4) It is espe-cially suited to very small water supplies and to the clari-fication of water for industrial uses. (5) The cost ofconstruction of the highly developed pressure filter ismaterially less than that of the gravity filter, and lowenough to more than offset a somewhat greater expensefor operation and mai
Engineering and Contracting . o great obstacles in the way of developingit to the point of equality with the best gravity filters asregards efliciency and reliability, for any capacity and formost waters. (3) It is better adapted to the treatmentof some waters than the gravity filter. (4) It is espe-cially suited to very small water supplies and to the clari-fication of water for industrial uses. (5) The cost ofconstruction of the highly developed pressure filter ismaterially less than that of the gravity filter, and lowenough to more than offset a somewhat greater expensefor operation and maintenance. (6) The improved pres-sure filter deserves the most careful consideration bysanitary engineers, filter manufacturers and public healthofficials. ENGINEERING WATER SUPPLY BY GAS ENGINEDRIVEN PUMP. I Contributed.) The water department of a central Pennsylvaniatown was compelled by a sevare drouth to shut off thewater supply from all the factories in the district itserved, and the supply even then was too scant to pro-. Emergency Gasoline Engine Water Supply. vide for the electric light and power plant on which theentire town was dependent. During this dry period anemergency supply was secured for over a month byplacing a gasoline-engine driven pump on the bank ofa stream about a mile away and conducting the dischargethrough a Ib-in. pipe. Night and day operation of the 34 ENGINEERINGAND CONTRACTING pump supplied the power plant (300 kw. capacity) andalso a large machine shop and foundry, all of which wouldotherwise have had to shut down. The pumping engine as illustrated was a 3 unitwith 4-in. pump (5-in stroke) having a capacity of over38,000 gal. in 24 hours. The two pipes leading down infront to the water are the suction and the overflow. Thelatter carried all surplus, which escaped through a re-lief valve, back to the stream. The considerable quan-tity of water shown coming back through this overflowindicated that the pump had plenty of surplus capacity. A gang
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