A Pure Water and Its Preservation: Presented by Continental Water Meter Company, Boston, Mass

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Wright & Potter printing Company, 1881 - Water-meters - 68 pages
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Page 47 - ... strength of 30.3 tons per square inch, elastic limit of 12 tons, and elongation of 20.75 per cent. The tough alloy, introduced by Mr. MP Parsons, will prove a desirable substitute for the common bronze in hydraulic apparatus, where its superior strength and greater reliability will be especially valuable. APPROXIMATE BOTTOM VELOCITIES OF FLOW IN CHANNELS AT WHICH THE FOLLOWING MATERIALS BEGIN TO MOVE. 2.5 feet per second, microscopic sand and clay. .50 " " ' " fine sand, i.oo " "
Page 17 - I will cite two cases. One large hotel which, on the first application of a meter, was found to be consuming, or, rather, wasting, 115,000 gallons of water daily, is now reduced to 45,000 gallons, and another has fallen from 80,000 gallons to 24,000 gallons daily.
Page 48 - If the valve is closed and the flow checked instantaneously, this great force will act upon the valve and upon the shell of the pipe. If the given length of...
Page 7 - Population increases ; the mass of buildings thickens ; the lands upon which the town is built become saturated with sewage, and the individual sources within the town are polluted ; the atmosphere over and within the town is fouled by gases arising therefrom ; and the dangers of epidemics, fevers, and contagious diseases increase.
Page 48 - ... while the water is flowing freely under pressure, such sudden closing of the valve will produce a strain upon the pipes far greater than that due to the static head of water. For illustration, let any delivery-pipe, having a stop-valve at its outflow end, be 1 ft. diameter = di, and 5,280 ft.
Page 47 - The pressure due to a given head of water is greater within a pipe when the water is at rest than when the current is flowing through the pipe at a steady rate, for when the current is moving a portion of the force of gravity is consumed in producing that motion, and in balancing frictions.
Page 47 - Diam. x 3.1416. Area of circle = Diam.2 x .7854. Surface of a sphere, . . . = Diam.ix 3.1416.

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