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Volume 45, Issue 446
Displaying 1-11 of 11 articles from this issue
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TORU MOTONO1925 Volume 45 Issue 446 Pages 757-765
Published: 1925
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe progress and development in the manufacturing industries of electrical machinery in Prance have been extraordinarily advanced during past ten years. The figures in the statistics of the exports and imports explain the fact clearly; and the sudden increase of excess of exports after 1921 is enough to prove that this country is tending to turn abroad the productivc capacity which was formerly devoted to reconstruct the damages given by the Great War.
Belfort Works of Societe Alsacienne de Construction Mecaniques is one of the most important factorys of electrical manufacturing industries. Among the certain specialities whch are developed in its own works a new system of the train lighting generator set has several important merits beyond the other existing systems.View full abstractDownload PDF (698K) -
H. YAGI, S. KOSEKI1925 Volume 45 Issue 446 Pages 766-772
Published: 1925
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThis is the report of experiments made in the Tohoku Imperial University.
The a ethods of producing continuous waves of ultra radio frequences are c'assified, aceording to the principle of action, into three kinds, namely those depending upon:
1. Retroactive coupling between the plate and the grid circuits (crdinally)
2. Ionic oscillation (Whiddington)
3. Eloctronic oscillation (Barkhausen and Kurz)
Special features of the above methods are pointed out.
Lecher wire system is the most accurate arrangemeut for the wave length measurement. In detecting the nodal points on the wires, the thermogalvanometer requires sufileient supply of energy, and the use of the Rubensche Flasche is to be recommended for the cases of weak cscillat ons.
By the metho I of re rnactive coupling between the plate and the grid circuits, wava lengths longer than 1 metre could be generated.
No oscillations were obtained by Southworth's method.
The znoet stable oscillations were produced by the use of two valves. (Holborn) By reducing the dimension of the circuit elements and varying the platc and the grid voltages, oscilhtitions were continuously obtained, finally reaching the stage of electronic osellation of Barkhausen and Kurz.
The authors obtained oscillations even with the plate disconnected, and the shortest wave length of 38 cm. was produced wi h the grad vol age of-300.View full abstractDownload PDF (735K) -
Y. NISHIMURA1925 Volume 45 Issue 446 Pages 773-782
Published: 1925
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSA two-valve generator of short electric waves at about 2.50 metres wave length could naintain the amplitude and the frequency of oscillation fairly steady and constant.
A receiver was place at the distance of 10 metres, and the coil under test was placed in front of it.
The generator was kept untouched and was sending out constant radiation. The dimension of the coil under test was varied and the intensity in the receiver system was observed. The change of intensity of the received energy was caused by the absorption and refraction by the coil, and the results clearly indicated its resonance point.
The coils tested were equilateral triangle, square and circle, each made of a single closed turn of B.S. No. 10 wire.
Afterwards the coils were cut at a point and a gap of 1cm. was formed. These open turns showed resonsance of the fundamental, the 2nd and the 3rd harmonic oscillations.
Though the accuracy of the measunement is still far from ideal, the results seem to be sufllclent to show that the method is well suited for giving very remarkable effects.View full abstractDownload PDF (449K) -
H. YAGI1925 Volume 45 Issue 446 Pages 783-787
Published: 1925
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSMr. Y. Nishimura has publishcd a new method of determining the natural wave length of single turn coils of various shapes. By observing the ab orption of electric waves due to the coils, the resonant frequency of the latter can be determined.
In his measurements, there are three points requiring improvements:
1. The absorbing system anl the receiving system are too closely situated. They should be placed farther away fr m each other.
2. The wave length of the radiated wave should be more accurately determiaed.
3. The coils forming the absorbing system must not be placed on the table, but should be frcely suspended in the air.
The whiter has ascertained that the wave length as determined by a parallel wire system well agrees with that determined by observing the resonance of a single rod absorber.
When the above mentioned 3 points are specially taken care of, the measurement at ultra-radio frequency is found to furnish reliatle results. A generator that can radiate waves at constant frequency must be prefered.View full abstractDownload PDF (304K) -
MASAKAZU TAKAHASHI1925 Volume 45 Issue 446 Pages 788-804
Published: 1925
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThis paper is the further research about "Charging of the Transmission Line and SelfExcitation of Alternators, " for which subject the author described on the Journal of the Institute of Electrical Engineers of Japan, July, 1924. In the former paper the balanced three phase and single phase phenomena are chiefly discussed and the author introduced an accurate graphical method for obtaining the voltage and current due to self-excitation of alternators from experimental data. In general for unbalanced three phase load, the alternator voltage and current can be obtained by the superposition of balanced three phase vector and single phase vectors.
The author applied this principle of superposition to the unbalanced three phase condensive load and obtained the method for the velt-ampere charging characteristics (Fig. 10) and the saturation curve excited by unbalanced armature leading current by using his formerly introduced method (Fig. 11.)
The self-excitation of alternators for unbalanced condensive load may be clearly explained by the intersection of these two curyes. In actual such a condition occurs when one line of isolated three phase trans nission system is grounded at the charging condition.
We experienced an abnormal veltage rise due to self-excitation of an alternator at Ryushima Power Station, Keihin Electric Power Company at such a condition during the test under the Ministry of Communications. The author applied above characteristics to this case and has given numerical values for voltage and current. (Fig. 20)
The Petersen earth coil is also recommendable for the avoidance of such an abnormal condition of self excitation, not merely for the use of the suppression of arcing ground.
This paper includes the following topics:-
(I) Introduction.
(II) Unbalanced condensive lead and characteristics of alternators.
(1) Unbadanced load and principle of super osition.
(2) Volt-ampere characteristics for unbalanced condensive load.
(3) Saturation curve excited by unbalanced armature leading cu rent.
(III) One line ground of three phase transmission system and self-excitation of alternators.
(1) One line ground of isolated three phase system.
(2) One line ground in the case of Petersen earth c il is used.
(IV) Numerical example.
(V) Conclusion.
Appendix.View full abstractDownload PDF (1105K) -
M. TAKAHASHI1925 Volume 45 Issue 446 Pages 805-818
Published: 1925
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSDownload PDF (1044K) -
M. IWATAKE1925 Volume 45 Issue 446 Pages 819-830
Published: 1925
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSIntending to measure the time lag of spark in solid dielectric, the author has uti'ized the same method as was used by the author to measure the time lag of spark in oil.
The solid dielectrics tested are ebonite, bees-wax, presspahn, paraffin, paper, mica and glass.
It can be in fered from the author's observations that:-
1. The time lag of spark in solid dielectric is greater than that in air.
2. The time lag of spark in solid diel ctric depends upon its material.
3. The solid dielectrics as mica and glas seem to have different characters from other solid dielectrics.
4. The time lag of spark in thin solid dielectric is in order of 10-8. sec. under the utilized source.
5. The empirical formula for the time lag of spark is:-
elther t=d2 or t=d√l
This paper consists of the following articles
ζ1 Introduction.
ζ2. Theory of time lag meaouoement in solid dielectric.
ζ3. Time lag measurements in solid d elecirocs.
ζ4. Comparative of servations of the time lag of sparks in solid dieloctrics.
ζ5. The empirical formula for the time lag of spark.
ζ6. Conclusion.View full abstractDownload PDF (473K) -
T. ENOMOTO1925 Volume 45 Issue 446 Pages 831-839
Published: 1925
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSDouble-circuit towers for extra-high tension transmission lines, which are generally employed at present, have the conductor arrangement such that three wires in one circuit are placed nearly in a vertical plane. The author states the possibility of frequent troubles of line-to-line flash-over, if such ordinary type towers be used in a mountain district of deep snowfall with long tower-span, caused by the jumping up and resilience of one conductor by the sudden fall of sleet, or by the unbalanced loading between conductors in parallel. As a conclusion, the author explains that it is important not to arrange three conductors in one plane; on the contrary that the horizontal distance between those planes containing each conductor shall be kept not less than 2 feet for a 77, 000 volt line, and 4 feet for a 164, 000 volt line.View full abstractDownload PDF (473K) -
K. OKABE1925 Volume 45 Issue 446 Pages 840-843
Published: 1925
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThis paper shows a new type of thermionic vacuum tube, which has a falling character, by the u e of electron reflection, secondary emission and magnetic field.
There are many difference botween this tube and "Dynatron" in the construction and the characteristics.
This tube has a water-wheel type grid.View full abstractDownload PDF (230K) -
[in Japanese]1925 Volume 45 Issue 446 Pages 844-845
Published: 1925
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSDownload PDF (115K) -
1925 Volume 45 Issue 446 Pages 846
Published: 1925
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSDownload PDF (48K)
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