Issue 17 and Volume 1895 16.

WATER SUPPLY AND PIPE DISTRIBUTION. (Continued from last week.) About forty pounds pressure at the nozzle is the least that will give good fire service with hose lengths of 300 feet, for the friction in an ordinary line of fire hose of this length will absorb about one-half of the available fire pressure at the hydrant. This loss may be reduced by siamesing two lines of hose into one nozzle, which would save a large proportion of the pressure usually wasted in friction between the hydrant and the nozzle. The head exhibited by a pressure guage attached to a hydrant or to a fire pipe within a building may often be very misleading as to the pressure available for projecting a fire stream from a hose nozzle. There are towns where the static pressure, or pressure with the water at rest, may be ninety pounds per square inch, but if…

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