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UNIFORMITY OF METHODS IN THE BENCHTESTING OF WATER METERS; ALSO COMPRISING A FEW SUGGESTIONS AS TO THE APPARATUS THEREFOR, WITH TABLES OF DELIVERIES THROUGH SMALL ORIFICES OF SPECIFIED FORM UNDER DEFINITE PRESSURE.

Issue 15 and Volume 1895 18.

UNIFORMITY OF METHODS IN THE BENCHTESTING OF WATER METERS; ALSO COMPRISING A FEW SUGGESTIONS AS TO THE APPARATUS THEREFOR, WITH TABLES OF DELIVERIES THROUGH SMALL ORIFICES OF SPECIFIED FORM UNDER DEFINITE PRESSURE. THE inquiry is occasionally made, if in testing a meter under low flows it makes any difference in the results as to whether the meter be throttled at the inlet or the outlet thereof. Generally speaking it is more favorable to the meter to throttle at the inlet, leaving the outlet fully open, as it is thus relieved of all strain except that of the back pressure of the outlet pipe. If meter devices were in theoretically perfect equilibrium, under pressure, there would be no difference; but there is no such mechanism. Consequently, if it were desired to obtain registration at the very lowest rates of flow, it would be advantageous, If the conditions would permit, to throttle…

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