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Volume 43, Issue 415
Displaying 1-4 of 4 articles from this issue
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S. BEKKU1923 Volume 43 Issue 415 Pages 79-96
Published: 1923
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe total self inductance for commercial power frequency of the aerial line with ground return is far greater than the value calculated by the principle of electric image. The experiments with commercial frequency tell that the voltage in the communication line induced electromagnetically by the neighbouring power line with ground return is far greater than the value calculated by the principle of electric image. These facts may be certainly due to the finite conductivity of eartb. K. W. Wagner had developed the theory of electric oscillation of parallel lines with the assumption equivalent to the principle of image, and obtanied the resalts that there exist travelling waves on each parallel line propagating with a velocity equal to the light velocity on both directions.
The author has developed the theory of the same problem for any value of the coefficients of magnetic induction and obtained the results that where there are n wires, n travelling waves of different propagation velocities exist on each wire in general, for the special case of symmetrical three phase line, which is dealt with special interest, the variety of velocity becomes two.
Thus for the symmetrical three phase line, there are two kinds of surge impedance, attention must be paid to this fact. As may be seen in the fundamental equation, the author did not consider the potential drop along the earth, somewhat contradictory to the supposition of the finite conductivity of earth. The validity of the theory must be checked with experiments on the actual transmission line, however, this theory can be applied without reserve to some kind of artificial transmission line. Artificial three phase power transmission line now under construction by the author at the Electrotechnical Laboratory is one example to which the author's theory is applicable.View full abstractDownload PDF (799K) -
YASUSI WATANABF1923 Volume 43 Issue 415 Pages 97-112
Published: 1923
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe writer treats herein of the frequency doubling devices.
Vellauri and Joly utilized very successfully the wave distortion of two highly saturated transformers.
Zenneck and Jonas, on the other hand, employed the current rectifying apparatus.
These methods may all be considered to rely upon a single and the same underlying principle, that, when the magnetic flux through a coil undergoes the change of a half wave of a sinusoidal curve, lasting only for that half period, a complete wave of current of nearly double frequency may flow through the coil circuit.
The writer shows that Zenneck's method by means of rectifiers can be greatly improved by means of D.C. magnetization applied in the opposite direction to the magnetization of the rectified current. The also treats experimentally with the direct method of deriving alternating currents of higher harmonics from a sinusoidal current source.
The experiments are made at 50 cycles per second.
This report includes the following topics:
I. Introduction.
II. Frequency doubler by means of rectifiers with D.C. magnetization.
III. Direct method of obtaining an alternating current of double frequency.
IV. Conclusions.View full abstractDownload PDF (890K) -
K. KUROKAWA1923 Volume 43 Issue 415 Pages 113-141
Published: 1923
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSIn the present paper, the writer accentuate the existence of the acoustic surge impedance or its density as defined by the complex ratio of pressure and velocity waves of sound through cloth or similar materials when both intensities are expressed in plane vectors and that of common attenuation constant in complex numbers for each wave.
A technique to measure these two constants is offered. The method is to measure the motional impedance of a telephone receiver coupled with an acoustic tube while the latter contains a sample of cloth or similar materials to be tested, as a sound screen somewhere in the tube. For a given frepuency, three measuremenents under different conditions of the tube are necessary to determine the two acoustic constants of the sample material when the receiver constants are known.
To show the usefulness of these constants, from the data thus obtained for a woolen cloth, propagation velocity of sound, reflection and transmission coefficients of pressure and velocity waves are calculated. In addition, a steady acoustic field-pressure and velocity waves as wall as power relations-near a semi-infinite screen and that of finite thickness is also discussed with numerical values for the woolen cloth.View full abstractDownload PDF (1901K) -
H. NUKIYAMA, Y. SHOJI1923 Volume 43 Issue 415 Pages 142-146
Published: 1923
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe T-section and π section of an artificial line may be combined in series in order to make the frequency characteristics of the artificial line more close to that of the uniform line to be represented. This combined Tπ type artificial electric line which has beeu proposed by the present authors(Journal of the Institute of Electrical Engineers of Japan, June, 1922) is a composite line in which the T sections and π sections have different values of surge impedance. In the present paper the combined Tπ line is theoretically treated as a homogeneous line by suitably combining the neighbouring T and π section together as shown in Fig. 2.(Nov. 1922)View full abstractDownload PDF (229K)
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