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Volume 4 (1957 - 1958･･･
- Issue 4 Pages 97-
- Issue 3 Pages 63-
- Issue 2 Pages 35-
- Issue 1 Pages 1-
Volume 4, Issue 1
Displaying 1-4 of 4 articles from this issue
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CHIKARA SUGAWA1957 Volume 4 Issue 1 Pages 1-5
Published: November 15, 1957
Released on J-STAGE: March 01, 2011
JOURNAL FREE ACCESSIn the preceding note of this volume, "On the inequality of the three axes of the earth deduced from the variation of latitude, " we tried to deduce (a-b), that is, the inequality between the two axes of the equator ellipse from the axial ratio of the Chandler ellipse. The extremely large inequality amounting to about 4800 m was deduced for the period 1934-1940. If this anomalous inequality existed really, it should have been detected from the world-wide gravity survey. In the preceding note we assumed the factor (C-_??_) (1-κ) in s (=B-A/2(C-_??_)(1-κ)) as invariable through the whole periods 1900-1952. As the Chandler period contains the factor (C-_??_) (1-κ) in a denominator, we examined the diagram between s and the Chandler period and found that it showed three 19 year period (moon's node period) series. The diagram between the semi-major axis of the Chandler ellipse and the axial ratio of the Chandler ellipse or s indicates a linear relation, and finally that between the Chandler period and the semi-major axis of the Chandler ellipse or the amplitude of the Chandler term shows also three 19 year period series. Thus the lunar effect on the relation between the Chandler period and amplitude was discovered as byproduct on the course of this investigation. Assuming (B-A) as invariable and being of the same order as derived from the gravity observations, we reproduced the Chandler periods from s or the axial ratio of the Chandler ellipse and found that the reproduced Chandler periods were quite different from the actual ones. Then we abandoned at once the above assumption and tried to deduce (a-b) from s by the variable values of the factor (C-_??_) (1-κ) derived from the actual variation of the Chandler period. The results, however, were almost same to the preceding values obtained by assuming the factor (C-_??_) (1-κ) as constant. Therefore we may conclude that the inequalities between the two principal moments of inertia on the earth's equatorial plane or those between the two axes of the earth's equator ellipse changed actually according to the periods.View full abstractDownload PDF (620K) -
Electronic Apparatus of E.T.D.Ietune TUBOKAWA, Takao SETO1957 Volume 4 Issue 1 Pages 6-14
Published: November 15, 1957
Released on J-STAGE: September 07, 2010
JOURNAL FREE ACCESSA fine knife edge can divide a small light spot into two parts with negligible loss of light. If the difference between the intensities of the lights reflected on both sides of the knife edge can be detected, the position of the spot relative to the knife edge or the time of passage of the spot over the edge can be determined.View full abstractDownload PDF (5414K) -
III Observation of the Meridian Passage of a StarIetsune TSUBOKAWA, Takeshi DAMBARA1957 Volume 4 Issue 1 Pages 15-23
Published: November 15, 1957
Released on J-STAGE: September 07, 2010
JOURNAL FREE ACCESSDownload PDF (3948K) -
TSUBOKAWA IETSUNE, MNORU TAZIMA, TAKAO SETO1957 Volume 4 Issue 1 Pages 24-32
Published: November 15, 1957
Released on J-STAGE: March 01, 2011
JOURNAL FREE ACCESSA nuclear precession magnetometer has been constructed for the precise measurement of the earth's total magnetic field. The interaction of the intrinsic magnetic moment of the proton in a sample of water with an external magnetic field F causes a precession of the spin axis of the proton about the magnetic field. The precessional frequency f is related to the magnitude of the total field F as follows:
2πf = γF (1)
where γ is a constant, known as the gyromagnetic ratio. The precession of the proton induces an e, m. f. in a coil wound around the sample. By measuring the frequency of this e. m. f., we can know the value of F from (1). The induced signal is amplified and mixed with a standard frequency of 1930 cps, and recorded as the beat frequency on the pen oscillograph tape. The number of beats within an accurately measured time interval of 2-3 seconds is readily measured with an uncertainty of less than ± 0.02.
The accuracy is thus better than ± 0.01 cps in frequency measurement, that is, ± 0.1- -0.2γ in the measurement of total magnetic field The brock diagram of the apparatus is shown in Fig. 1.
In June, 1957, the comparison measurements of the proton precession magnetometer with the GSI 1st and 2nd order magnetometers were made at Kanozan observatory and the result showed that the value of horizontal intensity obtained by the proton precession magnetometer is smaller than that reffered to the Japanese standard byl8 γ (27γ in total force).View full abstractDownload PDF (3025K)
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