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Volume 41, Issue 396
Displaying 1-6 of 6 articles from this issue
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N. Kishi1921Volume 41Issue 396 Pages 455-496
Published: 1921
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe article deals, first, with the historical development of the art of burning pulverized coal in the furnace and the present day tendency in its use. The advantages derived by the use of pulverized. coal and the results of actual test are carefully discussed. Later on the author describes the construction of the more important parts of the pulverized coal plantand compares the relative merit of the various types of plants now in service. The last part of the paper is taken up by the economics of pulverized coal plant and factors to be considered in the selection of the type of plant.View full abstractDownload PDF (3766K) -
H. Yagi1921Volume 41Issue 396 Pages 497-510
Published: 1921
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThis is the report of tests of some home-made triode vacuum tubes, carried out in the Tohoku Imperial University about eighteen months ago.
The static characteristics are first given, from which the operational constants such as “Mutual Conductance”, “Amplification Constant, ” etc. are derived.
After reviewing the behavior of the different types of tubes, some essential points are brought out about their design.
How the mutual conductance varies with the filament heating is then experimentally studied. The “Lumped Characteristics” of two entirely different kinds of triodes are plotted, as suggested by Prof. Eccles.
The photograph of the triodes under test is reproduced.View full abstractDownload PDF (1331K) -
T. Okamoto1921Volume 41Issue 396 Pages 511-521
Published: 1921
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSDownload PDF (888K) -
H. Ho.1921Volume 41Issue 396 Pages 522-530
Published: 1921
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSWith the assumptions that the earth has a uniform specific resistance, and that the stream-lines of current of commercial frequencies in it may be taken approximately as those determined with resistance only taken into account, it is shown that the EMF induced by a varying current in a straight transmission line with earth return, in a conductor one cm long parallel to the line at a point p distant y0 cm from the line, may be expressed by
(e. m. u.)
x and z being the distances from the two ends of the line to the foot of the perpendicular from p to the line. x or z is to be taken negative when p is outside the line, in either direction. Integrating this, the total EMF induced in a parallel line is obtained. As a result of application of the formula, the self-inductance of a single-conductor straight transmission line with earth return is shown to be
(e. m. u)
where D is the length of the line, r is the radius of the conductor. Lastly, the potential difference on earth surface is expressed in terms of the electrostatic capacities of the electrodes.View full abstractDownload PDF (478K) -
1921Volume 41Issue 396 Pages 531-536
Published: 1921
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSDownload PDF (204K) -
1921Volume 41Issue 396 Pages e3
Published: 1921
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSDownload PDF (21K)
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