The Journal of the Institute of Electrical Engineers of Japan

On the Underground Distribution Systems for Light and Power in American Cities

E. OGAWA

1926 Volume 46 Issue 450 Pages 3-24
Published: 1926
Released on J-STAGE: November 20, 2008

DOIhttps://doi.org/10.11526/ieejjournal1888.46.3

JOURNAL FREE ACCESS

Download PDF (2214K)
On the Relations between the Fundamental Wave Emission, Anode and Grid Currents of a Triode with Respect to their Amplitudes and Phases

EIJIRO TAKAGISHI

1926 Volume 46 Issue 450 Pages 29-34
Published: 1926
Released on J-STAGE: November 20, 2008

DOIhttps://doi.org/10.11526/ieejjournal1888.46.29

JOURNAL FREE ACCESS

Show abstractHide abstract

The fundamental wave dynamic characteristics of a triode, which are indispensable to examine its osciPating conditions, are discu sed fully based upon some results of measurement, being much accounted of the phase relations.
The writer then solved how to derive the dynamic characteristics of a triode from its static ones for any working conditions and explained its practical method, which is made po sible by means of the triangular chart.
On comparing the results of computation with those of measurement for many cases, it was assured that a good coincidence exists between them within a range of errors a lowable for practical purposes.

View full abstract

Download PDF (1346K)
On the Production of Short Electric Waves

S. UDA

1926 Volume 46 Issue 450 Pages 53-64
Published: 1926
Released on J-STAGE: November 20, 2008

DOIhttps://doi.org/10.11526/ieejjournal1888.46.53

JOURNAL FREE ACCESS

Show abstractHide abstract

This is the second report of experiments made in the Tohoku Imperial University. In the methods of producing short electric waves by two valves in parallel such as used by F. Holborn, the coupling between the plate and the grid circuits depends chiefly upon electrostatic action. If electromagnetic coupling is added to this electrostatic action between the plate and the grid circuits (M. Mesny, ) the intensity of oscillations will be increased, although the wave lengths become somewhat longer. The author also obtained, by the use of two valves, the most stable and powerful oscillations with suitable electromagnetic coupling, and short electric waves at different wave lengths of few metres could be produced. By the methods of Lecher wire system, the wave lengths could be accurately measured. The generators used by the author could maintain the amplitudes and the frequencies of oscillations steady and constant during our experiments; and wave lengths are only determined by the circuit constants and do not depend uopn the internal conditions of the electron tube generators. Professor H. Yagi obtained the stable audible beats by the use of two oscillators at about 10 metres wave lengths, which were the same circuits as above mentioned, but with the plate and grid coils of few turns. Afterwards Mr. S. Kubota in our laboratory also succeeded in producing stable beats note at the same order of wave lengths. The author also tried these experiments at 4.4 metres wave lengths and the same results could be obtained. The experimental studies are described, in which it is stated that the intensity of oscillations may be greatly affected by filament current, applied plate and grid voltages, and the resistance in series with the grid circuits.
And finally it is pointed out that the hysteresis phenomena were oberved in producing oscillations with positive and negative grid voltages and also that transient phenomena sometimes accompanied the starting of oscillations at certain small amount of filament current.

View full abstract

Download PDF (818K)
On the Transient Phenomena of Secondary Battery When the Charging Circuit is Opened

SAKAE MAKIO

1926 Volume 46 Issue 450 Pages 65-77
Published: 1926
Released on J-STAGE: November 20, 2008

DOIhttps://doi.org/10.11526/ieejjournal1888.46.65

JOURNAL FREE ACCESS

Show abstractHide abstract

On opening the charging circuit, the high potential of storage battery on charge will recover its normal voltage within a short time. This is called the "Erholung des Accumulators" by Dolezalek and has been studied by former investigators, author of this paper furthermore investigated on this point and discussed the influence of Cadmium ion upon this phenomena.

View full abstract

Download PDF (685K)
A Method of Calculation for Short Circuit Current of Alternator

J. SUGIURA

1926 Volume 46 Issue 450 Pages 78-83
Published: 1926
Released on J-STAGE: November 20, 2008

DOIhttps://doi.org/10.11526/ieejjournal1888.46.78

JOURNAL FREE ACCESS

Show abstractHide abstract

A practical calculation for short circuit current of alternator is shown. On the assumptions that magnetic circuits are all laminated, the armature current is lag behind the voltage by 90° and armature leakage reactance is constant, at first the duration of the transient phen mena is obtained and next the max. possible armature current is calculated with consideration of the field leaka e impedance.

View full abstract

Download PDF (234K)
On the Loci of Propagation Constant and Surge Impedance

K. KUROKAWA

1926 Volume 46 Issue 450 Pages 84-100
Published: 1926
Released on J-STAGE: November 20, 2008

DOIhttps://doi.org/10.11526/ieejjournal1888.46.84

JOURNAL FREE ACCESS

Show abstractHide abstract

When a vector terminal describes a certain locus on its plane, the square root value of that vector will also trace another correspondingly the latter may be called the square root or radical figure of the former. Thus, the radical figures of a straight line, a circle passing the origin, a circle in general position and a parabola having its axis on the abscissa are respectively shown to be a rectangular hyperbola, a lemniscate, a casinian curve or oval and a radical parabola, the last being so named for a while.
The loci of square vectors of the propagation constant or vector attenuation and the vector surge impedance, when one of the line constants or the angular velocity of the current is varied, are easily seen to be either one of a straight line, a circle or a parabola. Thus, their radical vectors or the propagation constant and the surge impedance themselves trace one of the radical figures, mentioned above. Each case is discussed in details.
As a numerical example, the loci for the standard telephone cable are traced, when the linear inductance, leakance or the angular velocity is varied.

View full abstract

Download PDF (826K)
On the Condition that no Natural Oscillations would occur, in a System of Electric Circuits

T. HOASHI

1926 Volume 46 Issue 450 Pages 101-106
Published: 1926
Released on J-STAGE: November 20, 2008

DOIhttps://doi.org/10.11526/ieejjournal1888.46.101

JOURNAL FREE ACCESS

Show abstractHide abstract

In the second term of the Heaviside's expantion the rem which expresses the transient phenomena of an clectrical system, eaeh root, Pm, of Z(p)=0, represents the characteristics of the respective ratural oscillation of that system. That s the real lart of Pm represents the damping of one of the patural oscillations in the system and the imaginary part of it represents the angular velocity of that oscillation.
In this paper, the writer introduced the sufficient condition which would give all roots of Z(p)=0 in pure rea'.

View full abstract

Download PDF (182K)

Register with J-STAGE for free!