. A new thermo-electric fluid-meter and hot-wire anemometer. Whirling Arm Used in Marvins Anemometer Tests, ^?^•^:.?.? :i;4:)t:>t:*5(c*>i;4: *¥+* + *>(:** + Ilia FIGUIta Small Oup Anemometer Attached to Spar ^bove Top of Kite. SECTION V. 112 THE MEASUREMENT OF WATER PLOW. The Venturl Meter, as Indicated by Figure 20 is a practical application of Bernoullis theorem inwhich it is stated: At Qvery section of a con-tinuous and steady stream, the total energy is con-stant; whatever head is lost as pressure is gainedas velocity. In terms of head this theorem m^y heexpressed as follows:

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. A new thermo-electric fluid-meter and hot-wire anemometer. Whirling Arm Used in Marvins Anemometer Tests, ^?^•^:.?.? :i;4:)t:>t:*5(c*>i;4: *¥+* + *>(:** + Ilia FIGUIta Small Oup Anemometer Attached to Spar ^bove Top of Kite. SECTION V. 112 THE MEASUREMENT OF WATER PLOW. The Venturl Meter, as Indicated by Figure 20 is a practical application of Bernoullis theorem inwhich it is stated: At Qvery section of a con-tinuous and steady stream, the total energy is con-stant; whatever head is lost as pressure is gainedas velocity. In terms of head this theorem m^y heexpressed as follows: Total Head ? velocity head ^ pressurehead -|- head due to elevation = constant; or in everystream section % s hy -I- hp -f- he » I^ -H E H- ^e ^®Q*2g y where y is the constant necessary to reduce pounds per square inch to head in feet, or ,433 for most purposes. In order to make this equation of practical application, a term representing the head lost in overcoming friction, hg, must be added on the right-hand side of the equation. This formula properly modified to the effect of friction- al resistance, is the basis of all empirical formulas

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