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Volume 48, Issue 481
Displaying 1-7 of 7 articles from this issue
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1928 Volume 48 Issue 481 Pages 166
Published: 1928
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSDownload PDF (51K) -
Tadashi ISHII1928 Volume 48 Issue 481 Pages 771-795
Published: 1928
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe remarkable progress of brake appliance and power signalling in the-railroad transportation in America to promote the safety of the train operation has recently been made beyond our supposition.
The Interstate Commerce Commission issued the orders to the prominent railroads to install the devices for automatic brake-application to stop or to reduce the speed of the train in order to guard against the failure of human elements.
All the railroads have completed their installation for the last year and the most of them have found it to be successful.
In this paper the author gives the brief description of these devices in the following items:
1. History.
2. The requirements and specifications given by the I. C. C.
3. Brief description of their types.
4. The relation to the train operation.
5. The advantages and some opinions of future development.View full abstractDownload PDF (4417K) -
S. BEKKU, O. NARASAKI, Y. MIYAMOTO1928 Volume 48 Issue 481 Pages 796-815
Published: 1928
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe Cathode-ray oscillograph has become an, indisiensable tool for various research works.
Among several similar types, Dufour's type has been used by several authors other than its originator and its excellent characteristic has been highly appreciated.
In working this oscillograph effectively, a considerable skill is required. This paper is the record of authors' experience of one year since the start of the work.
The blackening of the cathode was soon observed and we arranged the cathode to be detached from the tube; this principle has been also used independently by Dufour and Gabor.
In damp atmosphere there is appreciable surface leakage from cathode to anode, thus resulting in the unsteady focusing.
To overcome this difficulty, a special chamber is developed, and thus enabling the use of the oscillograph during the whole year. Without this device during 4-5 months the atmosphere is too damp (relative humidity ranging from 80% to above 90%) to get the oscillogram. The introduction of this chamber also lessened the blackening of the cathode.
The sweeping originally proposed by Dufour is to break the current in the sweeping coil by means of the mercury contact operated by the synchronous switch. To avoid the undesirable effect of mercury contact, a sweeping system using 50 cycle current was developed. Synchronous switch, high tension transformer and sweeping coils are fed from a ccmmon source of commercial power frequency. The current in the sweeping coil is always kept in quadrature with the voltage applied to the cathode, and the sweeping velocity is checked by measuring the current in coils. Another sweeping coil of higher velocity will be prepared before long. A synchronous switch of excellent flexibility is developed.
The deflecting coil and plate were found to be the unexpected source of error. The uniformity of the magnetic or electric field due to the field due to the deflecting coil or plate, especially of the former, was poorer than previously imagined. It is concluded that the deflecting coils should be placed nearer to the cathode than the deflecting plates.
The accuracy of the deflecting plates was computed from the theoretical basis, the report of the complete research will be published elsewhere by one of the authors.View full abstractDownload PDF (3723K) -
K. KUROKAWA, K. HAYAKAWA1928 Volume 48 Issue 481 Pages 816-827
Published: 1928
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe static characteristic surface of the plate current of triode tubes as a function of the plate and grid voltages are assumed to be represented with parts of four planes mutually intersecting. Then, the current and voltage amplitudes of the oscillating circuit are calculated from the condition of equality of the mean power supplied to the oscillating circuit by the source and tube, and that consumed in the oscillating circuit, neglecting the grid circuit loss. The calculated values are shown to confirm with experiments. In the same way, the circuit constants L, C and M which give the maximum output in the oscillating circuits for a specified frequency are calculated, when the source voltage and the circuit resistance are given.
Moreover, it is pointed out that one of the extremity points of plate current which gives the maximum output, appears to locate in the neighborhood of a particular point on the characteristic surface under different working conditions. If such is true, and the particular point is stated, the process of constant calculation is extremely simplifiedView full abstractDownload PDF (648K) -
Hidenaga MATSUOKA1928 Volume 48 Issue 481 Pages 828-839
Published: 1928
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe Yanagawara Power Station of the Nippon Electric Power Co. is designed for do ible-cycle system to supply power of both 50 and 60 cycles. Each turbine is provided with two kinds of runner, one for 50 cycles and the other for 60 cycles. The efficiency test is performed for each runner at both cycles. Measurement of water in the test is accomplished mainly by means of salt velocity method but at the same time Pitote tubes are also installed for the purpose of checking the results. In this paper, the author describes in full detail the methods of water measurement adopted and also explains their results.View full abstractDownload PDF (1377K) -
Hikosaburo ATAKA1928 Volume 48 Issue 481 Pages 840-855
Published: 1928
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSA rue for multiplication of two determinants can be applied to the series connection of two quadripoles. This paper is intended chiefly to show the applications of this rule. For current and voltage of the recurrent circuit, two expressions of different forms are given. It is shown that these two expressions are caused by the different substitutions of quantities and hence can be transfered each other. It is often relied on continued fraction in dealing with the ladder-shaped circuit. Here the mathematical properties for continued fraction are given from the electrical considerations, and the relation between continued fraction and hyperboric function is deduced. It was however already pointed out by Professor A. E. Kennelly.View full abstractDownload PDF (584K) -
K. KANAYA1928 Volume 48 Issue 481 Pages 856-867
Published: 1928
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSA convenient chart has been introduced∗ to compute theoretically the voltages induced electromagnetically in a communication line caused by an accidental grounding of a neighbouring power lines. It is derived from a mathematical treatment with the consideration of an Equivalent Earth Plane, and simply shows the relation between the voltage (K) induced per unit length per ampere of inducing current, as affected by a factor (m) representing the mean separation of both circuits. The chart is conventionally called K-M Chart as associated with the authors' names.
And the Depth of Equivalent Earth Plane is determined as follows by ohserved values of Daido Elec. Co. 154000-Volt Transmission Line.
The Main Island of Japan is divided into two parts, "Kwansai" and "Kwanto" by Fuji Volcanic Zone. The former is almost constructed by Meso oic or rather Pre-Mesozoic formations, and the latter almost by Cainozoic ones, and the observed values of induced voltage of various transmisson lines in Japan are compared with computed values at the stratigraphieal stand point.
Thus, we have some assurance for pre-dote mination of indueed voltage by using the K-M chart.View full abstractDownload PDF (945K)
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