Miscellaneous electrical applications on board a submarine boat which are rather unfamilier to the general public are explained in order to give a succinct idea about the electricity applied to naval & particularly to submarine purposes.
The mode of utilisation & the chief characteristics of every application are briefly described with some peculier points about their design.
In conclusion, a few notes about the improvement of such installations desirable & therefore earnestly required for the developement of this kind of vessels are stated.

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[in Japanese]

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Many device have been published to multiply the frequency of a given alternating current, but there is no static means to obtain 1/2, 1/3 etc. of the given frequency. This paper gives how such frequencies can be got by means of a three electrode vacuum tube. The same scheme can also be used as a frequency multipliers, and even to get frequencies such as 3/2, 2/3, 4/3, 3/4 etc. of the given frequency.
Some qualitative explanation of the behaviour of my apparatus is also given to be due to the non-linear characteristics of the three electrode vacuum tubes.
From the action and nature I wish to give a proper name to my apparatus such as: (Static) Frequency Transformer or (Static) Frequency Exchanger etc.

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In this paper, the author reports the experimental results about the time lag of surface creepage on photographic plate in air and in oil.
The time lag of surface creepage is measured by the same method as was utilized by the author to measure the time lag of spark.
It can be infered from the author's present investigations that: -
(1) The time lag of surface creepage on photographic plate, in air, varies with the shape of electrode on photographic plate.
(2) For equal surface creepage length, the time lag of surface creepage with half needle electrodes in air in shorter than that with half sphere electrodes, under constant surge voltage.
(3) For equal setting of surface creepage length, the time lag of surface creepage in air is shorter than that in oil.

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This paper deals with a simple method for calculating the reflection loss in a telephone circuit. From the impedances Z₁ and Z₂ looking toward both direction from the point of reflection calculate the complex reflection coefficient p by the well known formula p=Z₂-Z₁/Z₂+Z₁, and effective reflection coefficient p by the formula, P=1-√|p|²sin²θ+(1-|p|cosθ)², then the reflection loss in T.U. can be calculated by loss in T.U.=20log₁₀ 1/1-p
The anthers show the comparison of calcul ted results with those attain d by some experiments, and it was found that these results coinside very close.

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This paper shows chiefly the miscelleneous applications of various electronen phenomena, especially electron reflection and secondary emission, to four electrode vacume tubes and three electrode vacume tubes.
Proposed vacume tubes are as follows,
a) A Negative-Resistance Vacume Tube which utilizes Magnetic Field only.
It consists of three elements i.e., filament F, anode P and auxiliary anode S, as shown in Fig. 7, proper magnetic field being applied. The paths of electrons from F are shown by the dotted lines in Fig. 6. In this case, the effect of secondary electrons from P is negligible, because much part of the secondary electrons from P can not be attracted by auxiliary anode S. If the voltage of P increases, the current through P decreases, contrary if the voltage of P decreases, all of the thermoelectrons from F can be catched up by P as there is no effect of secondary emissions (including electron reflections). So that this tube has a negative resistance and its value is very small which is a desilab'e character for the generation of short electric waves.
b) Excited Four Electrode Vacume Tube.
Excited four electrode vacume tube, mamed by the writer, consists of four elements, i.e, filament F, grid G, anode P and auxiliary anode S, as shown in Fig. 15. The auxiliary anode S is made of special material and the secondary emission from this is very large. The connection diagram of this tube is shown in Fig. 20. In this new tube the anode current consists of the secondary electrons from S which is a few times larger than that of the thermoelectrons from F, and its characteristics are quitely similar so those of triode. Experiments showed that the internal resistance of this tube is 1/2-1/3 of those of triode which is under the same conditions, giving the same amplification constant.
Nextly, in this paper, it is pointed out that the Barkhausen und Kurz type oscillations, may be maintained by the actions of reflected electrons and secondary electrons at the surface of the grid, assumin that the grid voltage is high enough and the plate voltage is negative.

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