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Volume 47, Issue 464
Displaying 1-10 of 10 articles from this issue
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KONOSUKE NAKAMURA1927 Volume 47 Issue 464 Pages 197-198
Published: 1927
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSDownload PDF (183K) -
H. OSHIMA1927 Volume 47 Issue 464 Pages 217-224
Published: 1927
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSDownload PDF (1011K) -
On the Radio Field Intensity of Time Signal Sent Out by the Pearl Harbour Station, Observed at TokioT. MINOHARA1927 Volume 47 Issue 464 Pages 225-232
Published: 1927
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThis paper covers the results of a series of experiments carried out at the Naval Experimental and Research Establishment, Tokio, Commencing Sept. 1925, on the measurements of field intensity of the Time signal sent out by the Pearl Harbour Station. The variation of intensity during the entire time of observation was quite noticeable. On comparing these variations with those of atmospheric conditions including temperature, humidity and pressure, we have noticed that they are synchronous. Although the duration of the observations was inadequate, an interesting phenomenon was that their variations were in the same sense during a certain interval, while during another interval they were in the opposite sense, just as those we can find often in the meteorological phenomena. The distance 6400km. may be too long to make these conclusion, but it is very interesting that these results are very similar to that of Dr. Austin's observation made at a distance 200km and both papers were read at the same meeting of the last Pan-Pacific-science Congress.View full abstractDownload PDF (902K) -
Hidenaga MATSUOKA1927 Volume 47 Issue 464 Pages 233-248
Published: 1927
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe most difficult and most interesting problem in the hydraulic turbin test is the measurement of the water quatity. Among various methods applied for the purpose the salt velocity method is the simplest and least expensive and seems to have given more accurate results than any other methods. Consequently the application of this method to the test of hydraulic turbines has much increased recently. The author of this paper describes the method applied to and the results obtained in the efficiency test of the hydraulic turbines in the Kanidera Water Power Plant of the Nippon Electric Power Company.View full abstractDownload PDF (2511K) -
T. NAKAGAMI1927 Volume 47 Issue 464 Pages 249-255
Published: 1927
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSWe received the signal from KEL, Bolinas, Califo nia, U.S.A., on 29.3 meter wave at Iwatsuki Radio for 24 hours on 21st, October, 1926.
The audib lity curve and photograph of the tape on which the signal were recorded are attached, from which we will find somehow the recording conditions of KEL at Iwatsuki in this season of the year.
The signal were so strong and steady that we were able to receive them for 19 hours a day, that is, from 11.00am 6.00am J.C.S.T., and it was easy to record them on moderately high speeds during dark period, i.e. from 2.00 pm to 1, 00am next day. The receiving set used at Iwatsuki to record KEL consists of autodyne detector, 6 stage audio amplifier and rectifier. The transmitter at Bolinas works on power amplifier system exciting non directive vertical aerial with the rated output power of 20 K.W.View full abstractDownload PDF (1696K) -
S. MOCHIZUKI1927 Volume 47 Issue 464 Pages 257-264
Published: 1927
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSIn the cource of study of surface creepage in alternating field, prof. K. Nishi found that the surface discharge might cause short wave damped oscillations in the circuit, although he did not touch order of frequencies. In this short note, the writer's investigations of such a kind of oscillations mainly aimed to determine their frequencies are reported, and, following facts are observed.
1. The oscillation produced by the surface discharge has a definite frequency, independent of the stage of discharge, and its frequency definitely depends on the circuit constants, capacities to the earth being taken into consideration.
2. Even in the case that the solid insulation operates at over-stresses, approaching to its break-down pt, the frequency of the oscillation undergoes no change.
3. When the thin air layer of proper amount is provided in series with solid insulation between the electrodes, much stronger oscillations are obtained than in the case with the solid insulation in close contact to the electrodes.View full abstractDownload PDF (446K) -
YUJIRO OTSU1927 Volume 47 Issue 464 Pages 265-285
Published: 1927
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSIt is very important that we should obtain a reasonable coil form in electrical machines to avoid the trouble caused by their breaking down and layer short or turn short.
As a wh le, the insulating materials have a considerable breaking strength on their original state. Not withstanding the coils are covered with these materials pretty enough, they are frequently damaged at between layers or between conductor and earth. This act is resulted in the fact that the insulating materials are weakened by the undue me hanical stress caused when the coils are wound or when the coils are forced into the slot.
So, as the insulating materials are not reliable in mechanical strength, the coils of electrical machine must be wound into the reasonable form.
The shape of coils of ordinary machine which are spread around the slot is analogous to that of screw threads which ar cut on the surface of cylinder. Although the mechanical screw threads are cut chiefly on the cylindrical surface, coils of electrical machine are not only wound on the cylinder, but we also can build them on the conical surface or on the plain circle, and etc.
From this point of view, we have dwelt upon the reasonable form of coils on the several cases which are shown in the followi g articles
1. Introduction.
2. Coil form.
3. Coil thread on the cylindrical surface.
4. ″ ″ plain circle.
5. ″ ″ conical surface.
6. ″ ″ Annular ring surface.
7. Conclusion.View full abstractDownload PDF (2631K) -
YUZURU NINOMIYA1927 Volume 47 Issue 464 Pages 286-299
Published: 1927
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSWhen alternating current is superposed on direct current magnetization, the actual permeability on the alternating current side may be taken to be practically equal to the incremental permeability of the iron core under superposition as is shown by T. Spooner.(3) Starting from this point of view, a method for calculating incremental permeability is given in the present paper. The relation between the incremental permeability and the hysteresis lcop is first considered. By representing the descending part of the hysteresis loop in the same form of equation as givenl by E. A. Watson(6), a formula for the incremental permeability is derived:
μΔ=a0×1/1-b0×ΔHH……(17)
Or =a0+b0ΔB……(18)
where a0=BmHc(Bm-Br)/BrHm(Hm+Hc)……(15)
and b0=BrHm-Hc(Bm-Br)/BrHm(Hm+Hc)……(16)
Bm, Br and Hc in the above equations denote respectively the maximum flux density, the residual induction, and the coercive force of the hysteresis loop corresponding to the maximum magnetizing force Hm acting on the core under superposition. They are all of constant values for any particular core material under consideration.
Then a comparison is made between the formula given by T. Spooner and the results of the authers experiments. It is pointed out that the former gives only approximate mean values for different kinds of magnetic material, and that when any but very rough approximate accuracy is required, it is necessary and more convenient to have a0 and b0 calculated by the authers method for the individual materials and apply their values for the case under consid eration. Finally curves of a0 and b0 for two commercial core materials are given.View full abstractDownload PDF (794K) -
S. KANAZAWA1927 Volume 47 Issue 464 Pages 300-305
Published: 1927
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSIn this paper the action of a single phase kenotron rectifier, supplying an output voltage with a considerably less pulsation, is explained briefly.
Assuming that the supplied voltage has sinusoidal wave form, the relation between the ratio of working resistance of the kenotron to load resistance and that of supplied voltage to out put voltage, is simply obtained.
The writer then solved the question how to delive this working resistance of the kenotron from its static characteristic curve.
Comparing the results of computation with those of measurements, it was assured that a practically good coincidence exists between them.View full abstractDownload PDF (236K) -
Heiichi NUKIYAMA1927 Volume 47 Issue 464 Pages 306-324
Published: 1927
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThis paper deals with the theory of the phenomena of local transient, stationary state and periodic steady state of the electric field in imperfect dielectric medium. The phenomena of dielectric absorption, dielectric hysteresis, permanent polarization and the tensor ellipsoid of permanent polarization, etc. are also considered. The more detailed abstract will appear in the proceedings of the Imperial Academy of Japan.View full abstractDownload PDF (826K)
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