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Volume 45, Issue 440
Displaying 1-6 of 6 articles from this issue
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M. IWATAKE1925 Volume 45 Issue 440 Pages 217-226
Published: 1925
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe author, intending to measure the time lag of spark in transformer oil, has utilized the method which was used by the author to measure the time lag of spark in air.
The author has measured the time lag of spark across sphere gaps, with electrode diameters varying from 10mm. to 40mm., across cone gap and needle gap immersed in trans former oil.
It can be infered from the author's observations that:-
1. When the gap length is small, the time lag of spark in transformer oil is in order of 10-8 sec. as in wet air.
2. For equal setting of the gap length, the time lag of a needle gap is the greatest of all in transformer oil.
3. The time lag of a needle gap in transformer oil is very much greater than that in wet air.
4. When the gap length is small, the time lag of a sphere gap in transformer oil does not depend upon the diameter of the sphere.View full abstractDownload PDF (913K) -
YASUSI WATANABE1925 Volume 45 Issue 440 Pages 227-242
Published: 1925
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe writer considers in the present paper the jumping phenomena or the so-called "Zie herscheinungen" such as are observed in the two mutually coupled circuits comprising a triode valve oscillator.
In order to explain the jumping phenomena, it is necessary to consider the variation of a certain effective constant of the oscillatory system, that is dependent upon the amplitude of ossillation. The writer refers to the well-known falling oscillation characteristic for the case of electrostatically coupled circuits, and to the lumped voltage characteristic of a triode valve for the inductively coupled circuits.
For the former case, the condition of the existence of jumping phenomena is given by
α'/h1>1+β/σ……(eq. 24)
and the oscillation constant for the point J, at which the two jumping points coincide, is riven by
(x)J=(ω2/ω1)2 J=1/σ(1+d2/β)……(eq. 22)
These theoretical considerations are verified with some experimental results.
For the latter case, the condition of tie jnmping phenomena is
Nω12>ρ(1+β)……(eq.54, )
and the point J is simply given by x=1, i. e.. ω1=ω2•
There are three cases which may be considered concerning the magnitude of the product of the damping constants of respective oscillation circuits. When the damping constants are small, the jumping phenomena generally take place, and when they are a little higher, there is a "silent interval", within which no oscillation can exist. When the damping constant is still larger and exceeds a certain limit, an oscillation can always exist without any jumping phenomenon. This condition of imaginary coupling-so the writer will call it -is considered mathematically and the following results are obtained for the case of'inductively coupled circuits. The critical point C is given by
kc2=k'Mg-L1/ρ•R2/L2……(eq. 67, )
xc=1-kc2=σc……(eq. 68, )
and the range of imaginary coupling is given by the interval between the two intersecting. points of two curves represented by the equations
x/σ=q°2……(eq. 69, )
and q°=2x/1-ε+x……(eq. 70, )
The above results are fairly well verified by experiments. This paper includes the following topics.
Introduction,
Part I. Electrostatically coupled circuits.
I Falling oscillation-characteristic,
II Coupling frequencies and the amplitudes of oscillating voltages,
III Jumping phenomena,
IV Effect of changing the oscillation constant of the primary circuit. Part II. Inductively coupled circuits.
V Effective internal resistance of a vacuum tube,
VI Coupling frequencies and .amplitudes of oscillating currents,
VII Jumping phenomena,
VIII Critical coupling coefficient,
IX Effect of changing the oscillation constant of the primary circuit. Conclusions.View full abstractDownload PDF (1505K) -
ISAMU YAMAMOTO1925 Volume 45 Issue 440 Pages 259-277
Published: 1925
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSIn the present paper the self capacity of coils for radio use was studied systematically from both experimental and theoretical sides. Coil specimens under test, all wound on glass hollow cylinders with double cotton covered copper wires, included seventeen different coil of each type, single layer, two-layer, three-layer and four-layer banked windings, forming a total o sixty eight. Measurements of the self capacity and ilie natural resonant wave length of the coil were carried out when both ends of the coil were icsolated from the earth. The diameier of coils varied from about 6 to 22 c.m. and the axial length from 2, 5 to 20 c.m.
Part I is the brief description of literatures on this field of study.
Part II concerns with the preparation of coil specimens and the methcd of experiments. (Tables 1, 2, 3, 4 are to be refered)
Part III shows the experimental results. Since the radius of the coil r is the most important factor in determining the self capacity of the coil C0, the rat o C0/r was taken as a function of the dimension ratio h/2r. Curves (1) (2) (3) (4) show the ratios C0/r and λ0/2l as functions of h/2r.
From these results it was found that the ratio C0/r of the single layer coil remains practically the same for dimention ratios greater than unity, say 0.6, in our case. And although the value of C0/r of multi-layer banked winding coil is in general greater than that of the single layer coil having the same dimension ratio, this difference in self capacity practically disappears when the dimension ratio is greater than 2. That the ratio C0/r increases rapidly with small dimension ratios is die to the effect of glass frames.
The ratios of the fundamental natural wave length to their higher natural ones of the coil were investigatd and it was found that they take the normal harmonic order when the dimension ratio lies between O.5 and 0.7 (Curves (1°) (2) (3°) (4°) are to be refered.)
Part IV shows the value of C0/r calculated by the methed of Prof. Howe (Curve (B) is to be refered). These values agree with our experiments.
Part V shows the values of C0/r deduced from Drude's experimental results on natural resonant wave length of coils (Curve (C) is to be refered). It was shown that these values are greater than these calculated by Howe's method by 24% (March, 1924)
Part I Introduction.
Part II Preparation of Coil Specimens and the Method of Experiments.
Part III Experimental Results.
Part IV Calculation of Self Capacity By Howe's Method.
Part V Self Capacity Deduced From Drude's Experimental Results.View full abstractDownload PDF (995K) -
S. UDA1925 Volume 45 Issue 440 Pages 278-284
Published: 1925
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSIn this paper the author intended to investigate the action of an exciter operated by vibrating contact type automatic val age regulator, but in actual case the problem is too complicate to understand briefly and aho clearly. Then we here treat only the case in which the automatic voltage reguator is merely controlled by the terminal voltage of an exciter. And it is chiefly stated that the rapidity of an exciter actin is greatly affected by the resistance of its field circuit, required valtage, and operating condition of the magnetic circuit of an exciter.View full abstractDownload PDF (383K) -
K. KUROKAWA1925 Volume 45 Issue 440 Pages 285-301
Published: 1925
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe characteristics of telephone receivers are now well known as electric motors. They are, however, here studied as electric generators driven by sound. Necessary formulae for such vibratory generators, essentially borrowed from the theory of receivers, are first mentioned.
Experiments were carried out with two receivers, coupled acoustically with a tube, one as a motor and the other as a generator. The induced electromotive force of the generator varied remarkably with the frequency, although the motor current was kept constant. It reached, in one instane, up to 57 millivolts for 1 milliampere of motor current. Such a variation occured because the apparatus used in the tests was a coupled system of two diaphragms through an acoustic tube, each having its own natural frequency or frequencies. The e.m.f. also varied somewhat in the similar manner when the length of coupling was changed, keeping the frequency constant.
When the generator was loaded with capacitance, the terminal voltgae incr ased at first with the load current and then decreased. The current thus taken out, reached to 204 microamperes in one instance. For resistance load, the voltage dropped from the beginning with increase of load current. Thus the vibratory generator showed the same characteristies as alternators.
In addition, a system of two receivers with an acoustic coupling as used in the present tests, is studied in the appendix.View full abstractDownload PDF (915K) -
[in Japanese]1925 Volume 45 Issue 440 Pages 302
Published: 1925
Released on J-STAGE: May 20, 2013
JOURNAL FREE ACCESSDownload PDF (96K)
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