Electric conductivity of water between a pair of electrodes varies as the electrodes and the water are in a relative motion. A new method of measuring water discharge and relative velocity has been developed and was found to have excellent sensitivity, quick indication and applicability to very wide range of water discharge and relative velocity. The influences of water temperature and ion concentration are cancelled on diagrams prepared for the geometrical construction of each set consisting of a guide pipe, a pair of electrodes and a thermometer. Wave motion, turbulence and other instantaneous phenomena of water motion are easily observed and recorded with some modifications.
From some properties of the phenomenon the writers are convinced that it can be interpreted by the movement of ions and carried out some calculation to obtains the characteristic curves which proved a very close similarity to what had been observed in their experiments. As a result of calculation, the conductivity variation was understood to have been given rise to by the conduc-tivity difference between the water itself and the water domain through which the ions from the electrodes' surfaces move.

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In the second report, the optimum agitator sizes were determined. Therefore in this report, the agitators are confined to these sizes and the empirical formula for estimating the critical agitator speeds Nc was derived.
The values of K are shown in Table 2. It was found that the shape of the solid particles is important, and the shape factor was defined as follows.
The effect of the ratio of the quantity of solid particles to liquid was discussed and the ranges of the application of Nc equation above were decided as Fig 12.

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In a single tube cooler condenser, mixtures of vapor and air such as toluen-air, ethyl alcohol-air, methyl alcohol-air and water-air were cooled. The data of the coefficient of heat transfer h and that of mass transfer k' were correlated with the following analogous equation.
Above relations are identical with the equation derived from the analogy concept among the fluid friction, heat transfer and mass transfer for gaseous system (Pr, Sc=0.5-2.5).
In this experiment we reexamined that the following theoretical equation which we had reported before held good.
Where
Sh=Sherwood number f=Fanning type friction factor
Nu=Nusselt number C_p=specific heat of gas
Sc=Schmidt number ρ=denisity of gas
Pr=Prandtl number u=average velocity of gas

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[in Japanese]

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