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Volume 46, Issue 456
Displaying 1-8 of 8 articles from this issue
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T. NAKAYAMA, T. ONO, C. ANAZAWA1926 Volume 46 Issue 456 Pages 695-711
Published: 1926
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSWe made the long distance communications with different short wave lengths for one year to find out the relation between the wave lengths and possible communication hours, as well as the relation between the wave lengths and the communication distances.
In this report is written the general description on the long distance communication on short waves, and the test results for one year, and then the conclusion is given concerning the relation mentioned above.
The conclusion arrived at by our experiment is as follows:-
(1) The short wave of about 24 meters is critical.
(2) Short waves having the wave length of 23 meters or more are best utilized for night long distance communication.
(3) Short waves having the wave length of 22 or less are good for daylight long distance communication.
(4) It is ascertained that the phenomena of the skipped distance exists in the short wave transmission, especially for the short wave below 20 meters.View full abstractDownload PDF (2295K) -
Shintaro UDA1926 Volume 46 Issue 456 Pages 712-724
Published: 1926
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSExperimental studies on the reflecting system for short radio waves were made in the Tohoku Imperial University. Some results of which have been published in the previous numbers of this journal.
The present paper describes further experiments in directional radio transmission on a wave length of 4.4 metres. According to the author's experience, a parabolic reflector in not necessary. A reflector consisting of vertical metallic rods arranged along a polygonal base line drawn on the ground is equally effective. Each of these rods is tuned to a half wave length (2.2m) and spaced 1.1m apart.
The effects of varying the number of the reflector rods and of varying the aperture of the reflector were experimentally studied. Some experiments were also made of the effects of detuning the reflector rods. Good directional characteristic could be obtained when 19 reflector rods were used and the aperture of the reflector was nearly equal to 2.7 wave length. The radiated power was almost confined to an angle of 30°.
For the convenience of future references, the reflecting system above described will hereafter be called a "Polygonal reflector". When the polygonal reflector is employed at a receiving station, it may be called a "Polygonal collector".
The field due to a parabolic reflector was also determined under the same conditions as for the polygonal reflector. Nineteen reflector rods were erected along a parabolic curve with intervals equal to 1.1m and the aperture of the reflector was made again equal to 2.7 wave length. The radiation polar curves for both the parabolic and the polygonal reflectors show that these reflectors give the directional characteristics of nearly equal sharpness.
The paper also gives various types of directive antennae, such as "L type" "inverted L type" "U type" and "rectangular type" etc; for all of which the field-measurements were carried out.
Measurements of received currents were made with a receiving apparatus comprising a crystal detector and a microammeter. It has been very carefully ascertained that this crystal system gives the most consis ent results throughout the long time of experiments.View full abstractDownload PDF (1888K) -
T. UEMOTO1926 Volume 46 Issue 456 Pages 725-733
Published: 1926
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSIn this paper the writer introduces a new treater of the precipitation depended upon the so-called dependent discharge, and elucidates its theory. This treater invented by t e writer has two distinguished merits, that is,
1. It lowers electrode voltage.
2. It needs no rectifying apparatus.
As the electric precipitation is, on the whole, one of applications of the electrostatic induction, the writer explanates principally this phenomenon from the standpoint of the ionisation by collision theory. By dint of this explanation we can more easily understand such a few induction phenomena as the surface charge, residual charge and break down of insulators moreover for the sake of good insulation it can be justified that we must be careful not only upon the insulating material itself but also upon the circumstances of surrounding gases and liquids.
As to the precipitation, fumic particles are attracted by the resultant of the attracting and repulsing forces between their surface charges and the electrode potential. Therefore it may be concluded that when the direction of this resultant force, electric wind and gas blowing is coincident, we can operate it most effectively.View full abstractDownload PDF (599K) -
H. NUKIYAMA, K. NAGAI1926 Volume 46 Issue 456 Pages 734-741
Published: 1926
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSIn practice, it is usual for the induetance elements for audio frequencies to employ iron-cored inductances which have an air gap in order to avoid bulky dimensions and to make the ratioes of effective resistances to their reactances as small as possible. In the present paper, we have obtained the length of an air gap theoretically by the help of complex, permeability under a few assumptions, and some relations which are necessary for the design of the ironcored inductance are derived taking the leakage into account. The result of an experimental test is described to assertain the accuracy of the theory.View full abstractDownload PDF (284K) -
SAKAE MAKIO1926 Volume 46 Issue 456 Pages 742-749
Published: 1926
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSResults obtained in my experiments are sumarized as;
(1) Single potential diffecenee of Normal mercurous sulphate electrode at 18°C is 0.6758 volt on hydrogen scale.
(2) Thechange of e.m.f. of the normal mercurous sulphate electrode with temperature is 0.00026 volt per degree and negative.
(3) E.m.f. of N-mercurous sulphate electrode at t°C is represented by the equation.
Ehg (t)=0.6758-0.00026 (t-18)
(4) Application of this standard electrode to the secondary battery testing is shown in Figs 4 (arrangement of testing), 5 and 6 (characteristic curves of charge and discharge).View full abstractDownload PDF (1366K) -
S. OSHIMA1926 Volume 46 Issue 456 Pages 750-759
Published: 1926
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESS -
[in Japanese]1926 Volume 46 Issue 456 Pages 760-773
Published: 1926
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSDownload PDF (620K) -
1926 Volume 46 Issue 456 Pages 780
Published: 1926
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSDownload PDF (54K)
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