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Volume 46, Issue 451
Displaying 1-6 of 6 articles from this issue
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M. SUZUKI1926 Volume 46 Issue 451 Pages 109-152
Published: 1926
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSAn analytical study is made upon the economical design of Underground Power Transmission Lines which constitute the most important part of electrical system for energysupply in large city.
The whole article is divided into six chapters. The first chapter is intended to give approximate methods of determining the size and cost of underground cable, their applications being made for various cables. In the second chapter, the construction and laying of cable duct as well as its installation cost is investigated; and then the costs of variousducts are compared. The third chapter is devoted to show how to find the effective dimension of manhole and approximate cost of manhole with regard to its dimension. A curve is given from which the cost of manhole can be determined for various cases. In the fourth chapter, the cost of cable drawing and cable jointing is discussed with respect to different cables. In the fifth chapter, the current-carrying capacities of cables for various cases are calculated separately by Atkinson's and Simons'method, resslting in fair coincidence with both cases. Lastly in the sixth chapter, an attempt is made to give the method of economical design of underground transmission line, giving the economical number of duct, the economical line voltage and the economical conductor size of cable for various cases.
Since the voltage, the size, etc. of cable, design feature of cable duct and manhole and their respective unit-cost are based, upon the data for some limited cases, we cannot be sure to say that the result of this paper could be appl.ed to any cases. But it may be sure that the relations existing between several factors of underground cable system would be clearly illusrated by this paper.View full abstractDownload PDF (2895K) -
H. NUKIYAMA, Y. WATANABE1926 Volume 46 Issue 451 Pages 153-161
Published: 1926
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe present paper includes the following three topics: 1. Some remarks on the compensation of the a. c. potentiometor, 2. A. C. Currentometer, a new method of measuring an alternating current in magnitude and phase, 3. Theory of the a. c. currentometer.
Tie first Part gives some remarks on the a. c. potentiometer with special reference to its application to the measurement of a very high impedance. The effect of feeding current due to the connection of the potentiometer is considered in details.
A compensated potentiometer, as shown Fig. 4, is proposed as an ideal arrangement to accomplish a compensation of a potential of one of its detecting terminals in order to measure any potential difference at a natural feeding condition.
A practical circuital arrangement is also given, as shown in Fig. 5. In this case, it is im ortant to fix the feeding point at a suitable position, and to measure the potential difference of any point against this feeding point.
In the second part a new arrangement, which the writers suggest to call the A. C. Cur-rentometer, is described. By means of this apparatus, we can measure accurately the current of an order of microampere. The current is measured directly in magnitude and phase without any impedance drop.
As an example, the input impedance of a triode valve measured by these two methods, the a. c. potentiometer and a. c. currentometer, is compared.
In the third part, the theory of the a. c. currentometer is treated, and some remarks of practical importance are given. (Sendai, Oct. 1925)View full abstractDownload PDF (445K) -
YASUSI WATANABE1926 Volume 46 Issue 451 Pages 162-178
Published: 1926
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe circuit including the triode va've nay ba conveniently represented by the equi-valent circuit as shown in Fig. 1, when the grid is negative with respe t to the filament.
The problem of finding the input admittance consists in determining the grid current which flows in the external nput circuit as a result of the impressed input voluage. Therefore, we can treat this problem easily, as Ballantine did so firstly, by the law of superposition.
In the present paper, the writer intends to treat its dependence upon the load in the plate circuit, representing the input admittance in a vector diagram.
For the purpose of expressing the circuital relation of Fig. 1 in a vector diagram, the reciprocal theorem is also.
Some examples of this method of solution are given for the special cases of plate loading.
In the next place, the locus of the vector of the input admittance is considered. The locus may be expressed by a circle diagram, when the plate loading or the static coupling between the grid and the plate is varied. The position of the centre and the radius are given mathematically as a function of circuit 1 constants as well as valve constant
By means of an a. c curreutometor, the circle diagran is exper mentally obtai ed at ω=5000. Then, comparing the experimental results and the the retically obained ones, the writer comes to conclusion that it is neceseary, especially when the frequency is low, to tale into consideration the conductance between the grid and the filament, even when the grid is negative. Moreover, the relation between the input aemittance and the input voltage is considered.
Some remarks are also given relating to the input admit ance.View full abstractDownload PDF (781K) -
SADAO SHIMADA1926 Volume 46 Issue 451 Pages 179-192
Published: 1926
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThis is a report of tests on characteristics of electric ovens, and consists of the fellowing articles. 1. Introduction. 2. Construction and constant temperature regulator. 3. Temperature rise and decrease. 4. Power, consumption in constant temperature. 5. Comparison of power consumption. 6. Comparison of temperature regulator.View full abstractDownload PDF (1750K) -
MIKIO MAYUZUMI1926 Volume 46 Issue 451 Pages 193-208
Published: 1926
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSLjungstrom turbine has the prominent features such as superior economy in steam-consumption, great reduction in weight and dimensions, combined with increased working-safetyby the introduction of radial flow and double rotation system.
These advantages are realized not only by the improved design of construction but also by the special manufacturing process, for which and particularly for the latter, the writer has the p'easure to give the full eaplanaion in this paper under the following items:- 1. Introduction 2. Construction 3. Material 4. Blading (Blade ring) 5. Turbine Disc 6. Labyrinth Disc 7. Shaft Packing 8. Erection 9. ConclusionView full abstractDownload PDF (1576K) -
YASUSI WATANABE, TATSU NARITA1926 Volume 46 Issue 451 Pages 209-214
Published: 1926
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThis is the report of measurements of the internal electroslatic capacities of some homemade & foreign-made triode vacuum tubes. The method of determ ning of these very small capaities of a few μ.μ.F. consists in measuring the charging current by means of ana.c. current meter.(2)
Since no appreciable change of internal capacity is observed between the hot state andthe cold state of the filament, the measurement is carried out at the latter condition.
The results are tabulated in the present report, showing C1C2 and C3, whigh representsthe internal capacity between the grid and the filament, the grid and the plate, the plateand the filament respectively.
These values are greatly different with various kinds of valves, and reviewing theresults, it may le raid that they depends greatly upon the design at the leading and thesapporting wires of electrodes in the bulbs. (Sendni, nov. 1925)View full abstractDownload PDF (286K)
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