Issue 17 and Volume 39.

A COMBINATION WATER SUPPLY SYSTEM. It is often a difficult proposition to supply water to a five or six-story building with a minimum amount of pumping. the accompanying illustration is shown a sectional elevation of a building in which the water supply _____arranged with a number of valves, so that a minimum amount of pumping is required to supply water to all floors, In the city where this system is situated there are a number of localities where the water pressure varies as much as ten pounds in a day. The difference in pressure is considerably more between days when the reservoir is full and other days when the water is drawn down. T here is a certain section of New York citv. where there are a number of lofty or factory buildings of the six and seven-storv type, where the water can he readily raised most of the time…

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