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Volume 46, Issue 459
Displaying 1-7 of 7 articles from this issue
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S. CHIBA1926 Volume 46 Issue 459 Pages 1121-1126
Published: 1926
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe paper describes a new form of frequency meter for the accurate measurement of acoustic frequencies. The connections used are as shown in Fig. 3 and 4. The frequencies are given from the approximate formulae. f=1/2π√nCMandf=√n/2π√CM in these cases. With the tap position of the high resistance R in these figures, the constant n in these formulae can be changed. The frequency is then found by multiplying the reading of the scale by this factor n. The variable resistance in the plate-circuit of the triode amplifier is used to compensate the effect of the resistance which shunt the capacity C. It is explained with numerical examples that by suitable choice of the quantities C, M, and R, the error can be reduced to less than 1% over the entire range of the frequency to be measured.View full abstractDownload PDF (317K) -
M. OYAMA1926 Volume 46 Issue 459 Pages 1127-1136
Published: 1926
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSAbout Indian mica (muscovite), some experiments are carried in the temperature up to about 800°C.
Electrical conductivity seems to be constant in variable voltages, but varies with temperature as logI=b-a/T
where I=current, T=absolute temperature, and a & b are constants (the eresults were already reported in the last annual meeting).
Change of weight is observed during the temperature rise up to about 800°C, and it is affirmed that water of crystallization is driven off, in the temperature from 100°C to about 600°C, and water of constitution (about 4.6% as equal quantity as calculated from chemical canstitntion formula) is also driven off in about 700°C.
When mica thus burns, it becomes opaque and soft. Then the property is much depressed both mechanically and electrically.
Optical properties, percussion figures, and X-ray Laue figures are examined about both burned mica and normal one, and some comparisons and discussions are given.View full abstractDownload PDF (2199K) -
MITSURU MASHIKO1926 Volume 46 Issue 459 Pages 1137-1153
Published: 1926
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSBy means of synchronous condensers at a point midway in a long transmission line limit of static stability of the system is greatly enlarged.
Moreover, the transmission characteristics are improved so as to reduce the total condenser capacity and efficiently operate the generators in the system.
In this paper, the auther inve tigates the relation between characteristics on the above condition in details, and applying this relaion, explains that synchronous machines at any station can be utilized for another station in the system where the machines are inadequate for its own supply.
Synchronous condensers and its accessories for this purpose must be manufactured to withstand the continuous over voltage of about 10% rise, in the present practice.View full abstractDownload PDF (857K) -
YASUSI WATANABE1926 Volume 46 Issue 459 Pages 1154-1160
Published: 1926
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe author considers in this paper the jumping phenomena which take place in the variation of wave length of oscillation pr duced by means of a short wave valve oscillator, When a secondary circuit containing Lecher's parallel wires is coupled magnetically
As the length of parallel wires increases, the wave length of oscillation increases gradually lonher than the value λ1 of the oscillator itself, but atacertainPoint l1, it decreases suddenly down below λ1. Continueing to increase thewires, the second sudden decrement of the wave length occurs at a point d'st-ant from l1 by half wace length λ1.
Such a phenomenon takes place similarly when the receiving end of the para lel wires is shorted or open with only a difference that jumping points of these cases differ by a quater wave length λ1.
These jumping phenomena may be explained qualitatively by considering the effective impelance of the parallel wires at the sending terminals, and then by reducing it into a simple coupled circuit containing a valve oscillator, the characteristics of which have been treated entirely by many investigators.
The wave length is measured, in our experiment, by a wave meter, which is calibrated by the Lecher wire method.View full abstractDownload PDF (371K) -
H. NUKIYAMA1926 Volume 46 Issue 459 Pages 1161-1190
Published: 1926
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe expression of complex instantaneous power and complex average power (vector power) of the periodic current is given. A special charactor of a hom- ogeneous function of second degree is explained. This is utilized to deduce the law of conservation and transformation of vector power in an electrical network from the symbo'ic form of Lagrange's equation. The formula which show the law of conservation of vector power for nth harmonic is Σk p=1 [Vp, n, Ip, n]p+Σl (pq) [EpqmTpqm]p=J(n)+j2nω{T(n)-U(n)}……(38) and the formula which may be made the basis for treating the frequency transformation by complex circuit constant is Σk p=1 [Vp, n, Ip, n]p+Σl (pq) [EpqmTpqm]p=J(n)+j2ω{T(n)-U(n)}……(77)
This formula is utilized to treat the problem of resisti e, inductive and condensive frequency transformation.View full abstractDownload PDF (1180K) -
K. KUROKAWA1926 Volume 46 Issue 459 Pages 1191-1212
Published: 1926
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSBy taking the n-th root or vector inverse figure of concentric circles and radial lines, namely equipotentials and lines of force for a single line charge of infinite length and by applying the same proem successively one after another, a number of graphs of equipotentials and lines of force have been mapped out for two or more line charges, equal or unequal, of the same or opposite signs.
Such orthogonal systems of curves, although solvable cases are restricted, can far more easily be traced by the present method than by plotting the curves from their equations. More than one hundred sample cases obtainable by this method are tabulated, some being actually worked out.
Capacities between cylindrical conductors of some complex sectional forms which are obtained by the above method as equipotentials, if the capacity of their mother conductors are known, may easily be calculated by simply replacing the old dimensions of the capacity of mother conductors by the new ones and multiplying them by n when the transformation process is the n-th rooting and by unity when inversion. Several important cases are worked out, some of them being checked with known valuesView full abstractDownload PDF (987K) -
Y. FUKUCHI1926 Volume 46 Issue 459 Pages 1213-1230
Published: 1926
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSMany papers on theoretical studies of transient phenomena in a sudden short circuited alternator were published already, the important ones, so far as the authors knows, are Otake, Shimidzu and Ito, Biermanns and Boucherot, especially Otake's Solution-by an integral equation-is the most rigorously but too complex.
The following study starts from an assumption which may be probably acceptable-e∫ρpdθ-∫ρ1p1dθ_??_a constant (near unity), and results thus obtained these two circuit currents, i. e. exciting current and armature current, are mutUally different jπ/2 in their phases for for both transient terms and compared with those given by the above authors.
The case of an alternator with an automatic voltage regulator is also treated.View full abstractDownload PDF (887K)
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