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Volume 44, Issue 437
Displaying 1-8 of 8 articles from this issue
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K. OKABE1924 Volume 44 Issue 437 Pages 1101-1111
Published: 1924
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe various values of complex permeability are given which were obtained when the number of sheet irons and the number of exciting coils were varied.
They were got by the use of complex permeability bridge which was introduced by Prof. Nukiyama. and Mr. Shoji. Nextly, some relations are given, which are necessary for the design of telephone transformers by the help of complex permeability under a few assumption.
The experimental results are given in last.View full abstractDownload PDF (462K) -
YASUSI WATANABE1924 Volume 44 Issue 437 Pages 1112-1113
Published: 1924
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe writer describes a new graphical method of finding the integral ∫I(θ) sinθdθ. The principle of this method is simply that the curve I(θ) is graphed on a sheet of “Sine Diagram”, as the writer will call so, in which I(θ) sinθ is plotted as a function of θ.
As some examples of applications, the determination of the mean spherical candle power or light flux and the graphical analysis of harmonics are illustrated. (Sendai, July 1924)View full abstractDownload PDF (126K) -
T. ISHITAMA1924 Volume 44 Issue 437 Pages 1114-1121
Published: 1924
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe inherent and combined maximum output of the compound wound rotary converter, under the constant supply potental, with (a) its transformer in order to transform the supply voltage to a suitable slip ring voltage, (b) necessary reactance coil which is necessary to maintain the constant direct current voltage in general, or (c) the leakage transformer which is the combination of the two items (a) and (b), can be deduced by means of the Blondel's Bipolar Diagram. The writer gave the order of this maximum output by means of numerical examples on the existing machines, as he believed it was necessary to obtain the general idea about this fact.View full abstractDownload PDF (508K) -
T. MICHIDA1924 Volume 44 Issue 437 Pages 1122-1131
Published: 1924
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSSome tests were made with power transmission lines of Tokyo Electric Light Co. (110, 000V and 154, 000V) to see the effect of shielding wires upon the magnetic induction to the telephone and telegraph circuits. In this paper, these results are described and compared wite those obtanied from theoretical calculation; the method of which are also described.View full abstractDownload PDF (470K) -
K. KUROKAWA, T. HOASHI1924 Volume 44 Issue 437 Pages 1132-1138
Published: 1924
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSA bridge, composed of resistances in a pair of opposite arms and a capacitance and an inductance in another, each of the latter two having a resistance in series-namely the Hay's bridge-is here described as a new device to measure the frequency of alternating currents. The balance is obtained by adjusting the two resistances in series with capacitance and inductance. Then, the frequency in directly proportional to the resistance in the inductance arm. Thus the bridge has been called as a linear frequency bridge. By properly selecting the circuit constants of the bridge, the frequency may be given directly by the number of ohms of the resistance or any multiple of it. For instance, a bridege with two equal resistances of 594.39 ohms in a pair of opposite arms, a capacitance of 1 micro-farad and an inductance of 100 millihenries, each having an adjustable resistance in series, will give the frequency directly by the number of ohms of resistance in the inductance arm.
In appendices, two modifications of bridges, respectively given by M Wien and by Mathes and Cone on described. One may be called, in the case used in the text, as an approximately linear frequency bridge and the other as an approximately linear period bridge.View full abstractDownload PDF (393K) -
T. IWASE1924 Volume 44 Issue 437 Pages 1139-1154
Published: 1924
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSAfter a little explanation of the general principles of automatic telephone exchange system, and showing the actual operation of Strowger switches with a demonstration set, various trunking schemes in large multi-office area were discussed. The reasons why the government authorities had decided to adopt the automatic system for the reconstruction of the telephone system in Tokyo and Yokohama, which were destroyed by the big fire & earthquake took place at those territories were fully stated by considering the initial, operating, & maintenance expenses of telephone exchange equipments & lines for both of automatic & manual. At last, some remarks on designing of automatic were given.View full abstractDownload PDF (3331K) -
YONEJIRO KAKAMI, YASUJI IWABUCHI1924 Volume 44 Issue 437 Pages 1155-1195
Published: 1924
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe object of this study is to discuss the economical relation between the power loaded and the conductor size in aerial high tension distribution systems and to let the designer to use the results as easily as possible.
Firstly, the present conditions of the power distribution from the substations in Nagoya City are described and especially the characteristics of the distribution power in the distribution line are discussed in details. Then the unit cost of the materials used and the labouring cost are tabulated, and it is described that how much annual percentage income must be required for the fixed charge of the distribution line from the view point of the company The general equation presenting the annual expense for one span of the most common or the standard line construction of Nagoya City is considered, which has two high tension circuits, 60 cycle 3 phase 3 wire system.
For this purpose the annual expense is divided into 3 parts, i.e. that of all the fixtures without conducters that of the conducters (including low tension line loss) and that of high tension loss. The equation is simplified as possible considering the given conditions of the line system, i.e. the night light system, the all-day power system and the all-day light-and-power system; the cost of power lost being chosen as 1 sen, 2.5 sen and 3 sen per KWH.
Th_??_n the most economical conductor size is deduced from the general equation for the den an 1 power at the end of the new line or the transmitting power in the feeder, along whi_??_h the distributed load is comparatively small. This condition is obtained from the condition that the annual expense for one span is minimum for the given transmitting power.
Next the same economical study is made for the 2 kinds of lines, i.e. the line of 1 high tension circuit and that of 3 high tension circuits.
Finally the above economical relations are checked from the point of view of the voltage drop or regulation and it is verified that the above economical relation represented in the simple curves, may be adopted, without consideration of the voltage drop.View full abstractDownload PDF (2217K) -
K. KOBAYASHI1924 Volume 44 Issue 437 Pages 1196-1205
Published: 1924
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe motional impedance measurements of the vibrating coil type telephone receiver as not simply a sounder, but as a measuring instrument in the acoustic study, are described.
Some factors of the design to obtain a satisfactory character of the telephone receiver for the acoustic research are studied experimentally. This paper includes following topics.
1. Introductory remarks.
2. Motional impedance.
3. Simplification of the vibrating system.
4. Experimental check of the simplification of the vibrating system.View full abstractDownload PDF (575K)
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