A ratiometer of three-cross-coil type as shown in Fig. 1 is discussed. The moving part, consisting of three coils fixed each other, rests at a certain angle when in equilibrium, and the angle shows the ratio of electric currents in the coils. A ratiometer of this type is useful when one of the currents may become 0, for example, when very high electric resistance is measured. A conductivitymeter of this type is discussed. Its circuit is shown in Fig. 3. The pole pieces are cut as shown in Fig. 4, so that the magnetic field changes, resulting in the change of scale distribution. This is applied to a conductivitymeter of H2SO4 for improving the distribution.

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In a pulp plant the author put into practice a trial plan to eliminate the various troubles caused by steam load variations due to the operation of digesters (so-called batch process) and obtained a favorable result.
The result is given here as the first report although some improvements on the plan seems to be necessary for attaining satisfactory achievement.

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A method to measure the specific resistance in the range over 10¹⁴Ω-cm is described. The potential decay across the plate of insulator after a constant potential is impressed on it, is mea sured by the compensating electro-motive force applied to the vibrating electrode located on the insulator. From the measurement of its decay time constant, the specific resistance is obtained, independent of the dimensions of the insulator plate.
A ring guard electrode is placed around the upper electrode on the insulator to obtain the effect of the surface leakage resistance. By connecting it to the vibrating electrode or the lower electrode of the insulator, both the specific resistance and surface resistance are obtained from the decay time constants. For measuring a high resistor, the resistor is connected parallel to a condenser of very large time constant of potential decay. Its resistance is obtained from the measurement of the potential decay of the resistor and condenser as in the above case. The results of the measurement are shown of some synthetic resins and resistors.

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A solid heat flow meter has been made for the purpose of measuring the heat transferred to any point by the heat radiation of flame in O.H. furnace and continuous heating furnace.
The heat detector of the solid heat flow meter is made of copper cylinder, 50mm in diameter and 10mm in thickness.
The temperature of the copper cylinder is measured with a C.A. thermocouple inserted into the center of the cylinder.
The time required to raise the temperature of the copper cylinder from the room temperature t₀ °C to the temperature t °C is obtained with a stop watch and the transferred heat is calculated by the temperature difference and the time obtained with the watch.
This solid flow meter is simpler in construction and easier in handling compared with a water cooled heat flow meter. An actual few examples of measuring furnace temperature and transferred heat have been given in the last paragraph of this report.

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冗長度(redundancy)を増すことによって信頼性(reliability)を高めるという問題は最近種々な角度から検討されている。MooreとShannonによる上記論文は,これをリレー・モデルによって考察したものでAutomata Studiesにおける典型的な手法の一つがここにみられる。原論文は35ページにおよぶ長篇でこれを全部紹介することはとても不可能であるから,話のすじみちに直接関係した部分だけに限り,証明はいっさい省略した。したがって,von Neumannのニューロン・モデルによる方法との比較など興味ある部分も割愛された。

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