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Volume 41, Issue 400
Displaying 1-8 of 8 articles from this issue
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K. Murozumi1921 Volume 41 Issue 400 Pages 799-812
Published: 1921
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSTo protect transmission systems from lightning and static disturbances, the use of arresters is most important and great deal of attention must be paid to see that they function properly. There are two essential properties which should be in_??_erent in the arrester to make it virtual safety valve: fist, it must offer a very high resistance to the flow of current at normal voltage; and a very low resistance to ground at abnormal voltages, the change of resistance being instantaneous with the change in voltage; second, it must be a condenser so that its effective resistance to ground to current at normal frequencies is great, but to current at high abnornal frequencies small. Aluminum cell and oxide film arresters possessing the above two qualities have given great deal of satisfaction to transmission companies and are used very extensively, However, in very high voltage and large capacity stations, the aluminum cell arresters are used exclusively.
In Japan most of the aluminum cell arresters now in use had been bought from General Electric and Westinghouse companies, but very recently arresters manufactured by Hitachi and yasukawa companies have appeared on the market. But it was many years of experimenting and study that made the manufacture of satisfactory commercial arresters in this country possible. The greatest difficulty was encountered in building thick film on the surfaces of the aluminum trays. The author tells what means had been devised to obtain the desired result.View full abstractDownload PDF (875K) -
H. Ho.1921 Volume 41 Issue 400 Pages 813-815
Published: 1921
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSAs the continuation of the author's former paper in the July number of the Journal, it is shown that the electromagnetic induction due to a transmission line with earth return, which is in form any arbitrary combination of straight lines, can be calculated by applying the formula obtained for a simple straight line to each straight portion of the given line and summing up the results. Method of calculating the effective self-inductance is also shown. A few corrections of the former paper suffixed.View full abstractDownload PDF (180K) -
E. Ishii1921 Volume 41 Issue 400 Pages 816-823
Published: 1921
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSIt has been generally conceded by battery specialists that temperature above 38°C in lead accumulators lessens the life considerably. Numerous experiments conducted by the author with the “Excide” battery have shown, however, that even above this temperature, the life of the accumulators is not much affected. It was also proven that there is a most economical temperature for accumulators and this is dependent on acid density. The latter part of this paper is taken up by the author's theory of temperature rise in lead cells and its relation to temperature of the surrounding air, density of the acid solution, current density and the method used for cooling the cells. Sufficient experimental data is presented in this paper for reference.View full abstractDownload PDF (516K) -
E. Takagishi.1921 Volume 41 Issue 400 Pages 824-835
Published: 1921
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe subject matter is treated in three sections. The first section deals with the wonder-ful development and improvement that is possible in the vast communication system of this country by the use of vacuum tube. Our attention is paid to the necessity of improvement in the exisiting land and ship radio stations and in stallation of various stations based upon this new principle, e. g. wired wireless stations, exchange offices for wired and wireless messages, etc.
The second section is taken up by the theory of the vacuum tube of large capacities and the design of such a tube is discussed. The author brings out the fact that manufacture of power tubes is an immediate necessity in this country and shonld be given great deal of consideration.
In the third section, designs of high frequency telephone and telegrapt apparatus with a connection diagram are given together with the author's comments and explanations. The paper is concluded with a plea those interested in the development of communication work in Japan should stand, united to help make the establishment of high frequency communication system with vacuum tubes an immediate realization.View full abstractDownload PDF (1042K) -
H. Matsuoka1921 Volume 41 Issue 400 Pages 836-841
Published: 1921
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThis paper gives an adverse view of the paper on “Nationalization of Electric Power Plants” presented by S. Tada as the September meeting of the Institute. The author makes it very plain that an important subject such as this should not be treated mere'y from the firancial standpoint. He gives his view on the amalgamation of electric power plants and the uniform power rate system. In short, this may be regarded as a discussion of Tada's paper.
The main portion of this paper may be summarized as given herebelow. The relation between the natural resources of the country and the generation of electric power and their bearing on modern industrial activities are treated in great length. He reviews the fuel problem, the plans of river improvement, the forestry policy, the question of railway electrification and the plans of national defence as having close connections with the nationalization of electric power plants. He further advances the idea that coordination of power plants will bring about efficient utilization of electric energy and will bring along with it lower power cost hence more complete electrificaton of industrial plants and greater application of electrictity to houses old appliances. All these are in accordance with the program of socialization of public utilities which is being received so enthusiastically as an absolute necessity by the Japanese people. It is the authors firm conviction that nationalization will alone bring about the desired result.View full abstractDownload PDF (490K) -
S. Kudo1921 Volume 41 Issue 400 Pages 842-860
Published: 1921
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSDownload PDF (1519K) -
T. Ueno1921 Volume 41 Issue 400 Pages 861-863
Published: 1921
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSDownload PDF (184K) -
H. Maruyama1921 Volume 41 Issue 400 Pages 864-870
Published: 1921
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSDownload PDF (454K)
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