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Volume 45, Issue 438
Displaying 1-8 of 8 articles from this issue
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TADASHI SEIKE1925 Volume 45 Issue 438 Pages 5-33
Published: 1925
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSDownload PDF (5223K) -
K. KUROKAWA1925 Volume 45 Issue 438 Pages 34-44
Published: 1925
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSStatic and dynamic tests of a microphone transmitter are described. For a transmitter kept quiet, both constant voltage and constant current tests were performed by noting the variation of current or voltage with respect to time and therefore that of static resistance.
For dynamic tests, vibrations were given to the transmitter acoustically from a telephone receiver carrying an alternating current of audible frequency. Moreover, a direct current was send to the transmitter through a high resistance. Continuous and alternating voltages thus appeared across the terminals of the transmitter were measured with D.C. and A.C. potentiometers. Thus, the no load dynamic characteristics are obtained by varying the alternating current through the driving receiver, its frequency or the direct current of the transmitter.View full abstractDownload PDF (772K) -
M. IWATAKA1925 Volume 45 Issue 438 Pages 45-56
Published: 1925
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe question about the time lag of spark has already been discussed by many investigators.
In 1923, Prof. P. O. Pedersen published that according to his measurements the time lag in wet air is of the order of 10-8 second.
On the other hand W. Hiller and E. Regener reported in april 1924 that the lag in perfectly dried air amounts to the order of minutes
The author, intending to determine the time lag of spark in moderate state of air, has utilized the method due to Pedersen, but the author has used the positive photograhic figures which are much larger and easier to observe than the negative photographic figures as were originally by Prof. Pedersen.
The author has measured the time lag of spark of 250 mm. dia. sphere gap, 25 mm. dia. sphere gap, cone gap, and needle gap in moderate wet atmosphere.
It can be infered from the author's Observations that:-
1. When the gap length is small, the time lag of a sphere gap does not depend upon the diameter of the sphere.
2. For equal setting of the gap length, the time lag of a needle gap is smallest of all.
3. In an average condition of air, the time lag of spark for small gap length is in order of 10-8 sec. just as was estimated by Prof. Pedersen.View full abstractDownload PDF (1484K) -
YASUSI WATANABE1925 Volume 45 Issue 438 Pages 57-76
Published: 1925
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSIt has previously been known that automatic synchronization takes place between two mutt ally coupled triode oscillators. For the sale of simplicity of mathematical analysis, the author cnrrders in this paler a certain simple care, in which the action between two oscillators is in one direction only.
It is assumed that an alternating e.m.f. of constant frequency is inserted in a grid circuit of a triode valve oscillator, and the natural frequency of the latter is slowly varied across over resonance. When the forced oscillation due to the impressed e.m.f. and the free oscillation produced by the retroactive action between the grid and the plate circuits are nearly in resonance, the former tends to suppress the latter, and thus the automatic synchronization takes place.
An explanation is given to this synchronization phenomenon from the point of view of stability of the free oscillation.
The idea is proposed that, when the forced oscillation approaches resonance and becomes intense, the effective internal resistance of the triode becomes so high that a stable free oscillation cannot exist any longer.
The simultaneous equations comprising the intensities of these two oscillations and their phase angles cannot be solved by simple mathematical methods, but they lends themselves to graphical solution. The expression of internal resistance, in our problem, contains two independent variables, namely the amplitudes of both oscillations, so that the graphical treatment of its characteristic surface must naturally be complicated. The author has however deviced simple graphical treatments on planes.
By an entirely graphical method, the author also explains jumping phenomena, which occur in synchronization when either the impressed e.m.f. or the natural frequency of the oscillator is varied, and lie finds out some simple conditions relating to the occurrence of the jumping phenomena.
Experiments have been carried out using a Braun tube oscillograph and the jumping phenomena have been very clearly observed.
Some experimental reaults of the harmonic synchronization are also given.
This paper includes the following topics:
I. Introduction some remarks on the previous investigations.
II. Variation of the effective internal resistance.
III. Condition for the automatic synchronization.
IV. Jumping phenomena in synchronization.
V. Experiments.
VI. Harmonic synchronization.View full abstractDownload PDF (1227K) -
S. SHIMADA1925 Volume 45 Issue 438 Pages 77-82
Published: 1925
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe application of X rays to industrial research uses where high penetration is required has awakened manufactures of X rays apparatus to the necessity for a generator of high potentials. That will run continuously for hours with the minimum amount of attention. Up to the present time the necessary voltages to produce X rays of short wave length and therefore with high penetrative power, have been produced by means of the induction coil or transformer with a mechanical r etifier. It is to meet the needs of the radiologists or radiographer who requires X rays of short wave length that such apparatus as this has been designed. This generator produces a continuous tension whish has distinct advantages over the interrupted current produced by the coil or transformer with mechanical rectifier. The continuous current generator use in made of a static step up transformer. The transformation of the high tension alternating current into high tension direct current is accomplished with the aid of rectifiers and condensers. The special feature of the reetifier for such work as this is that it must be capable of allowing the current to pass to charge the condenser and immediately the condenser is fully charged the rectifier must stop any tendency for the condenser to discharge itself.
The generator is capable of producing 10 milliamperes at a potential 125, 000 Volts and maximum volts is 140, 000 volts when the generator is working at full out put the variation of potential across the X ray tube does not exceas 5%.View full abstractDownload PDF (755K) -
SHIGEO MOCHIZUKI1925 Volume 45 Issue 438 Pages 83-89
Published: 1925
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe creeping spark discharge over solid insulation in air and transformer oil is investigated for the case:-
(I) With the electrodes on the same side of the glass plite.
(II) With the electrodes placed on opposite sides of the glass plate.
In the case (I), the spark discharge in oil does not always creep over the solid insclation as in air, but passes at intervals into oil, diverging some disance from the surface.
In the case (II), in air, the spark discharges on both sides more distinetly creep along the surface of the solid in ultaion, somewhat restraining each other. In oil, however only in the positive side it creeps over the solid insuhtion, and in the negafive side it onguas in oil far apart from the surface.
Such a difference in character of creeping discharge in oil compared with chat in air seems to depend on the deficiency of free electron and the lack of homogeneily in oil.View full abstractDownload PDF (974K) -
K. KUROKAWA, T. HIROTA1925 Volume 45 Issue 438 Pages 90-116
Published: 1925
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe vector ratios of two quantities among voltages, currents and charges of inductively coupled two circuits are calculated, and their properties under variable freguencies are investigated by tracing their vector loci.
Generally, the loci commonly used in the alternating current theory, are almost circles The frequency characteristics of inductively coupled two circuits, however, are seldom represented by simple circles or straight lines, but almost always by s ch loci that are guided by parabolas or their inversions or besides them guided by circles or straight lines.
General forms of such loci are described in the text for each of twelve i nportant ratios, while their details are shown in the appendices with curves and tables.View full abstractDownload PDF (1190K) -
T. ISONO1925 Volume 45 Issue 438 Pages 117-126
Published: 1925
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSPoly Pha c Induction Motor is an asynchronous motor and rues with a slip fro n the synchronous speed or the speed of the speed of the rotating field flux.
The slip of nduct on motor changes with the mechanical load and gives some flexibilities between the motor and the load.
For the requrirements of a constan speed runing with adj sta le speed the Induction Motors are more reliable than Synehron us Motor which has a consant speed without slip for any n_echanical load.
Induction Motor, however, has a nature to slip down for any mechanical load to produce the torque just equal to that of the load.
The writer explains a combination of Induction motor and a special frequency changer to keep the speed constant and independent to the primary frequency, primary e. m. f. and the mechanical load.
The idea of the principle is to keep the difference between the primary frequency f1 and secondary frequency f2 constant by a special frequency changer.
Speed of Induction Motor is repres nted by
n=120(f1-f2)/P
P=Number of Poles of the Induction Motor.
The secondary frequency of the frequency changer is represented by
f2=f1-n'P'/120
P'=Number of poles of the frequency changer.
n'=Number of revolution of the frequency changer.
Substituting the above equation to the value of n, we have
n=n'P'/P
For the constant values of P and P', n is proportional to n' which may easily be kept constant and therefore the speed of Induction motor should be constant and also adjustable by regulating the speed of the frequency charnger n'.View full abstractDownload PDF (719K)
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