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Volume 47, Issue 472
Displaying 1-11 of 11 articles from this issue
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Sotarô AOKI1927 Volume 47 Issue 472 Pages 1153-1168
Published: 1927
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSDescription is made, in the first few chapters, of the theory and constructions of the mercury arc rectifier, together with its accessesories, sach as, oil vacuum pump, mercury vapour pump, McL od manometerand resistance manometer, with sqecial refer nce to a 300-kw set made by Shibaura Engineering Works. The operating characteristies of the rectifier, with its transformer connected in various manners, is next explained, and especially the action of the interphase reactor. Finally the principal causes of troubles of the rectifier are mentioned, with their proposed remedies, these being are back, flashing, abnormal high voltage, telephone line interference, & C.View full abstractDownload PDF (1707K) -
Shiro SANO1927 Volume 47 Issue 472 Pages 1169-1178
Published: 1927
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSContrary to what might be called an ordinary expectation, the electric bell does not operate satisfactorily at a long distance if its terminal voltage is kept at a value which gives entire satisfaction near the source of e. m. f. This is due to the fact that when the interrupter of the bell makes contact the current is drawn through a long distance having a large resistance which causes a heavy drop in the line while when the interrupter opens the drop in line becomes nil, the voltmeter measuring the mean value at the terminals which comprises a large proportion of full voltage. The effect of the resistance and inductance in the line upon the operation of the bell is discussed in full for either A. C. or D. C. circuit. Simple formulas are given for the predetermination of operation of the bell at a long distance. A number of oscillograms are given to illustrate and clarify the theory.View full abstractDownload PDF (1678K) -
Y. Toriyama1927 Volume 47 Issue 472 Pages 1179-1184
Published: 1927
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe author describes a new method of measurement of the spark lag in this paper. He measured the spark lag by means of a Braun tube.
The principle of his method is shown in Fig. 2. As we see in the figure, he connected the deflecting plates of the Braun tube to a spark gap to be measured in series, and applied a impulse voltage to the gap and the cathode of the Braun tube at the same time. If there is no time lag in the gap, the impulse voltage is applied to the cathode and the deflecting plates of the Braun tube at the same time. In this case, as the electrons thrown out from the cathode are deflected by the electro-static field of the deflecting plates, so we can not see any spot on the fluorescent plate. In other words, if there is no spot there is no time lag in the gap.
When spark lag exists in the gap, the Cathode is excited at first and after a certain time corresponding to the time lag the deflecting plates are charged, so that we can see a spot on the fluorescent plate of the Braun tube.
By using aerial line whose length is adjustable, we can measure the duration of the time lag.
The author measured the time lag of a needle gap and sphere gaps of 1.8 cm diameter and 5cm diameter, and found that the needle gap gives the larger time lag and the sphere gap of 5cm diameter gives the smallest.
He found also that the ultraviolet ray from a quartz lamp minimises the time lag very remarkably.View full abstractDownload PDF (389K) -
Isamu YAMAMOTO1927 Volume 47 Issue 472 Pages 1185-1193
Published: 1927
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe general expression which gives the electrostatic capacity between two similar co-axial rings was derived, and the actual capacities of twelve different pairs of co-axial rings were measured by the method of substitution of known capacity.
It was concluded that wh n the distance between rings is not small the capacity may be calculated approximately by our formula and when the distance is small compared with the ring diameter the capacity is practically the same as in the case where the rings were straightened in to a pair of parallel wires keeping the distance unchanged, as shown in Curves (4)(5)(6).
The results of our study may be applied for many branches of high frequency engineering, especially for the stray electrostatic coupling existing in various parts of high figh frequency circuit and for the high frequency characteristics of the extra high tension transformer for heavy current use.
This paper will be described as follows;
(I) General expression.
(II) Capacity of the isolated ring.
(III) Calculation of capacity between two similar co-axial rings.
(IV) Experiment.
(V) Comparison between calculated values and measured values.View full abstractDownload PDF (451K) -
Kichizo SHIMIDZU1927 Volume 47 Issue 472 Pages 1194-1200
Published: 1927
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSIn three core cables used to transmit three-phase a. c., insertion of a conducting layer around each conductor reduces tangential stress in the interior of the cable. At the proper position of the conducting layer tangential stress may be limited to a reasonable low value, in which case the cable is more economical than the metal sheathed cable as H-type cable.View full abstractDownload PDF (295K) -
The Effects of Wave Reflector and Director on Sending AntennaS. UDA1927 Volume 47 Issue 472 Pages 1201-1219
Published: 1927
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe effects of wave reflector and director on sending antenna circuit are theoretically studied with special reference to the following points:
1. Effect on antenna current.
2. Effect on antenna power.
3. Wave reflector and director characteristics at constant antenna current and power.
4. Directive polar diagrams at constant antenna current and power.
Some experimental results are also shown and compared with the calculated one.View full abstractDownload PDF (947K) -
Kazukiyo Ogawa1927 Volume 47 Issue 472 Pages 1220-1235
Published: 1927
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe paper describes the author's method of measuring the residual inductance of resistance coils. The author beleives that his method is convenient and more accurate than the methods hitherto published by Grover and Curtis, Wagner and Wertheimer, etc. As the standard of resistance of which residual inductance is calculable; the author used the parallel wires of about 20 meters which may be short-circuited at any intermediate point. The alternating current bridge which is used by the author is similar to that used by Wagner and Wertheimer, but is provided with the perfect earthing device by which the accuracy of the bridge is considerably increased.View full abstractDownload PDF (1039K) -
[in Japanese]1927 Volume 47 Issue 472 Pages 1245-1249
Published: 1927
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSDownload PDF (907K) -
[in Japanese]1927 Volume 47 Issue 472 Pages 1250-1253
Published: 1927
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSDownload PDF (241K) -
1927 Volume 47 Issue 472 Pages 1253
Published: 1927
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSDownload PDF (56K) -
1927 Volume 47 Issue 472 Pages 1254
Published: 1927
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSDownload PDF (41K)
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