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Volume 47, Issue 465
Displaying 1-10 of 10 articles from this issue
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M. TAKADA, K. TSUKIURA1927 Volume 47 Issue 465 Pages 329-344
Published: 1927
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSReport on the test result of the mercury vapour rectifier at the Tameike Substation of the be reau of the Tokyo Mun cipality. Reason why they has been adopted and course of formation is mentioned. From the test data simple calculations are made about the wave formes, power factor etc.View full abstractDownload PDF (3401K) -
M. ÔYAMA, Z. HIKASA1927 Volume 47 Issue 465 Pages 345-351
Published: 1927
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSReflection of heat ray by several metal surfaces is investigated, using, as a heat-ray sourcs, the total radiation of nichrome heat-element of common use, and a thermopile as a detector.
Brass, copper and aluminium are the practical materials for reflector of electric heater. The reflecting power of these materials is in the range of 75-90% for polished surfaces and about 60% for tarnished surfaces Chromium platod copper plate is also tested. Its reflecting power is the same order of that of the above materials. But, owing to its stronger resistance against rust, chromium plating will be widely applied to reflector in near future.
Reflection from rough surfaces-polished surfaces by sand-paper and frosted glass-is investigated, and Wood's theory about reflection of unpolished surfaces is examined and ascertained by our test results, that reflection from rough surface increases as angle of incidence increases.
Reflecting power is well qualified for the measure of polishing, for it quantitatively indicates the degree of finishing of polished surfaces.View full abstractDownload PDF (362K) -
Toshikazu MASHIMO1927 Volume 47 Issue 465 Pages 352-356
Published: 1927
Released on J-STAGE: November 20, 2008
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S. TADA1927 Volume 47 Issue 465 Pages 357-371
Published: 1927
Released on J-STAGE: November 20, 2008
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I. Directional Observations at TôkyôJûichi OBATA1927 Volume 47 Issue 465 Pages 372-379
Published: 1927
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe present paper contains a preliminary account on the directional observations of atmospherics at Tôkyô. The observations were commenced in July 1926, and is now being continued. The apparatus employed is a simple radiogoniometer. The loop antenna is five feet square and consists of 60 turns of thin stranded wire wound with 1/4 inch spacing, and is tuned to a wavelength of 10, 000 metres. With suitable amplifications records of atmospherics are obtained by means of a high frequency oscillograph; directing the loop to various azimuths, the number of atmospherics per eight seconds is obtained at each directions.
Although it would be very much premature to draw a definite co clusion from the observations extending only a short period of time on t e nature of such a geophysical phenomenon as the radio-atmospheric disturbance which seems to suffer the influences of various causes, yet the results so far obtained seem to indicate, that the majority of the atmospherics observed at Tôkyô come from a definite region, which varies according to the season.
The apparent direction of arrival of most atmospherics at Tôkyô during summer and autumn, when they are most prevalent, are given in the following table :View full abstractDownload PDF (372K) -
H. NUKIYAMA, K. NAGAI1927 Volume 47 Issue 465 Pages 380-395
Published: 1927
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSIf Z1 is the impedance of the source, Z2 the impedance of the load, Lp the complex self-inductance of the primary, Ls the complex self-inductance of the secondary of the transformer, M the complex mutual inductance between the primary and the secondary, Rp and Rs the'resistance of the primary and the secondary respectively the transformer constants may be expressed by Lp and other four constants p, κ, Ap, As as follows.
Ls=p2Lp
M=pκLp
Rp=ApLp
Rs=p2AsLp
where p is the ratio of transformation, κ the coupling coefficient, Ap and Asthe complex damping constant of the primary and the secondary respectively. Assuming the slope of Lp, Ls and M to be equal, the ratio of transformation to give maximum output is
p=√|Z2(Z1/jωLp+1-jAp/ω)|/|Z1(1-jAs/ω)+jωLp{(1-jAp/ω)(1-jAs/ω)-κ2}|……(14)
From this basis, the design theory of the maximum output transformer is given.View full abstractDownload PDF (605K) -
S. UDA1927 Volume 47 Issue 465 Pages 396-403
Published: 1927
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSA new method of direction control of the short wave beam is described, and the experimental results are given in the paper.
The arrangement of the system for the case with eight directionality is shown in the following figure.
A vertical sending antenna denoted by O is at the centre, and of 16 other conductors erected around it, R's are reflectors and D's are directors. They are arranged on concentric circles whose radii are 1/4λ and 1/2λ(λ being the wave length) respectively.
Maximum energy is radiated in the direction of the arrow. When the length of D's is varied, the radiation in the arrow direction changes, and so long as the length is larger than 1/2λ, the wave is almost screened and comparatively little energy is transmitted.
On the other hand, when their length is made smaller than 1/2λ, there is a region in which the received energy becomes much augmented due to the existence of the rods.
If means are provided to control the natural wave-lengths of rods, so that the wave may be radiated in any other desired direction, then the beam with variable directionality can be produced. Thus the wave may be sent into several different directions in any desired order or especially in successively rotating manner. The control of rods may be done electrically or mecanically, by push button device or by automatic means, and the beam can thus be roted neither by changing the position of conductors nor by revolving a large structure.
Another case for 16 different directions has also been experimented, and the polar curve is given.
More wave directors may conveniently be arranged along radial lines to improve the sharpness of beam in those directions. The interval between these directors must of course be larger than 1/4λ and smaller than 1/2λ.
This sort of short wave radio beacon is quite simple and is belived to find applications in directing ships approaching the shore or guiding the aviators flying in the darkness.View full abstractDownload PDF (387K) -
Toshio SUGIE1927 Volume 47 Issue 465 Pages 404-423
Published: 1927
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe paper gives the results of a comprehensive study of the effect of bush angle and combined turn-ratio on the general characteristics in case of three phase series commutator motor, and further a new predetermination of the characteristics derived from a comparatively simple analisation of vector-diagram and saturation curve. Finally the performance characteristics calculated by means of this method are fully compared with actual test results obtained on a motor designed by the anther.View full abstractDownload PDF (994K) -
On the Relation between the Secondary Electron Emission from Nickel and Tungsten and its TemperatureH. NUKIYAMA, H. HORIKAWA1927 Volume 47 Issue 465 Pages 424-433
Published: 1927
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe present research was worked out with three electrods value as shown in Fig. 1 and Fig. 2, which was exhausted to the pressnre of about 10-5m.m. Hg., and its plate was heated with a separate battery. We used as its anode a nickel foil and a tungsten wire respectively in two different cases. This nickel foil was obtained by electroplating.
The temperature of the specimens was determined by the optical pyrometer for the nickel foil, and by Lungmuir's method(1) for the tungsten wire. The relation between the secondary electron emission and the Anode temperature was obtained at Vg=509.9 volts, and Vp=261.0 volts for nickel foil, and for tungsten wire Vg=500.1 volts constant corresponding to Vp=79.8, 90, 98, 110, 120.2, 130, 142.8, 148.8, 163.4, volts respectively.
This relation is shown in Fig. 6, Fig. 10, respectively. This figures show that the secondary electron emission for nickel increase gradually with temperature from room temperature to near 400°C and above this temperature decrease comparatively sharpe with its temperature, but at about 800°C this secondary electron emission again increase a little and immediately decrease. But with tungsten wire as the anode, the secondary electron emission was substantially constant up to the temperature at which the primary electron emission began to appear. The first abrupt change of the secondary electron emission with temperature for nickel foil at about 400°C correspond to A2 transformation of nickel. But the second abrupt change correspond to A2 transformation of iron. As we know only A2 transformation for nickel, the first change may be due to the nature of a nickel but the second change due to the impurity of iron included in the nickel foil or some other unknown courses. We took also the (Ip-Vp) characteristic of tungsten wire at the room temerature, 850°K and 1350°K, but the critical potentials was not so clearly observed at 850°K and 1350°K as at room temperaturs. This disapperance of the critical potentials may be due to a greater energy of molecules at higher temperature.View full abstractDownload PDF (655K) -
M. DOTE1927 Volume 47 Issue 465 Pages 434-439
Published: 1927
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe use of Tinsley-Gall Co-ordinate Potentiometer is prevailing for accurate a. c. measurment. The author deviced a new method of producing quadrature current for the above potentiometer as described in the text. This method is specially convenient for frequencies less than 150 cycles per second and the adjustment of phase and magnitude of the quadrature current for the variation of working frequency is effected by setting two rheostats independently. Other methods recommended by Messrs Tinsley & Co. or used by other auther are also described.View full abstractDownload PDF (397K)
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