The relations among the variables, namely, specific gravity and viscosity of the liquid and flow-rate or weight and dimensions of the float affecting the performances of the flow meter of this type, were obtained by means of the Dimensional Analysis, and its results were verified by the experiments.
Next, the experimental formula, among the whole tube, of the relations between the flow-rate at the gap area is deduced from the considerations of the flow-pattern at the gap, which is characterized by the number "Rd".

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A new method of telemetering employing the principle of stepping tube is introduced. As this method is by the application of an electronic device, its response is sufficiently quick for the measurement of mechanical displacement. This is a chief merit of this method compared with the electromagnetic one (such as by self synchronous motor) which necessarily has a considerable inertia effect.
The signal sender consists of a group of contacts arranged on a straight line or on a circumference and a movable contact which slides on the contacts following the displacement to be meas-ured. The indicator means a stepping tube or a counting circuit using stepping tubes. The signal sender and the indicator are connected by 4 lines, and the momentary position of the movable contact of the former is indicated in the stepping tube of the latter.
This method is applied to indicate the readings of a dial-indicator with successful results.

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A photoelectric torquemeter which can be applied to the high speed shaft is described here. Figure 2 shows a slit pattern for a glass disc of 240 slits and Figure 3 an exterior of this apparatus. Figure 1 shows a schematic diagram illustrating the principle of this torquemeter. Since the torsional angle of the shaft to which torque is applied is converted into the relative displacement between two slitted discs, the area illuminated on the cell changes in proportion to the torsional angle as shown in Figure 5.
As the parts of this meter are machined by the lathe, a good dynamic balancing is obtained. A measuring system is, as shown in Figure 1, prevented by means of the bearing from rotating. Accordingly this torquemeter can sufficiently be applied to the high speed shaft (more than 10, 000rpm).

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