Journal of the Geodetic Society of Japan
Online ISSN : 2185-517X
Print ISSN : 0038-0830
ISSN-L : 0038-0830
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Volume 2, Issue 1
Displaying 1-10 of 10 articles from this issue
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  • On the Correction against Inclination of the Base Line
    Yoshimichi HARADA, Masanobu HIROBE
    1955 Volume 2 Issue 1 Pages 1-4
    Published: July 30, 1955
    Released on J-STAGE: September 07, 2010
    DOIhttps://doi.org/10.11366/sokuchi1954.2.1
    JOURNAL FREE ACCESS
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    In measuring the base line, the correction for the length derived from the deformation of the catenary must be applied when the inclination of the base line is as large as seen in the gallery of mine. The writer introduced a formula of correction, assuming that the tension of the either end of the catenary wire is equal to the tension by which the length of the wire is compared with the horizontal base line of known length . Numerical estimation up to the order of 10-5 is also worked out .
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  • Some Calculations of the Closing Errors of the Level-Circuits deduced from the Actually Observed Gravities.
    Yoichiro FUJII
    1955 Volume 2 Issue 1 Pages 5-7
    Published: July 30, 1955
    Released on J-STAGE: March 01, 2011
    DOIhttps://doi.org/10.11366/sokuchi1954.2.5
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    The recent developments of the gravity measurements by using WORDEN gravi meter make the theoretical evaluations of closing errors of the level-circuits much easier. The writer has tried to execute some numerical calculations. By the formula (9) the calculation is executed with the two level-circuits traversing the southern part of Hokkaido and the one traversing the Kwanto district. Lastly brief discussions are given about the results obtained.
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  • Azimuthal Twin of the Japanese First-Order Triangulation Net
    T OKUDA, Y KITANO, T DAMBARA
    1955 Volume 2 Issue 1 Pages 8-14
    Published: July 30, 1955
    Released on J-STAGE: September 07, 2010
    DOIhttps://doi.org/10.11366/sokuchi1954.2.8
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    Observations of the vertical deflections and astronomical azimuthes at Laplace points in Japan were commenced in 1947 by the Geographical Survey Institute. On the basis of these observations, the azimuthal twist of the Japanese first-order triangulation net was studied. First, the astronomical longitude, latitude and azimuth at the geodetic datum point were compared with the values adopted as the standard datum of the Japanese geodetic coordinates. The differences in a sense of a-g were found as:dL0=-0.75, dB0=-0."50and dA0=-0."50.Reducing these values for the geodetic positions of 35 triangular points where the astronomical azimuths were observed, the corrected residuals of the Laplace equation were calculated. The mean of these residuals becomes about +0."7, and it is verified that, as a whole, large or systematic azimuthal twist does not exist in our first-order triangulation net in spite of the omission of the Laplace adjustment.
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  • Some Experiments on the Oscillation of a GSI Pendulum Apparatus
    Eiji INOUE, Hiromiti SUZUKI
    1955 Volume 2 Issue 1 Pages 15-17
    Published: July 30, 1955
    Released on J-STAGE: September 07, 2010
    DOIhttps://doi.org/10.11366/sokuchi1954.2.15
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    MEINESZ's three pendulum method was adopted by a GSI pendulum apparatus, in order to eliminate influences on the period of the pendulum due to pulsation of the ground and to flexual motion of the pendulum case caused by the oscillation of the pendulums. To exmine how effective the method is on the apparatus, some experiments were carried out and it was found that the influences were eliminated effectively. If the MEINESZ's method is not adopted, the flexure of the case results the increasing of the period corresponds to 5 milligals on this apparatus.
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  • Calibration of a NORTH AMERICAN Gravimeter
    Eiji INOUE, Hiromiti SUZUKI, Takashi TERAO, Hideko HAYASHI
    1955 Volume 2 Issue 1 Pages 18-20
    Published: July 30, 1955
    Released on J-STAGE: September 07, 2010
    DOIhttps://doi.org/10.11366/sokuchi1954.2.18
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    In regard to a gravity survey over a wide area, uncertainties of scale values of gravi meters results more serious effects than accumulations of errors due to the drift and of accidental ones do. A NORTH AMERICAN Gravimeter was calibrated by comparing the results obtained with those by a GSI pendulum apparatus. Accuracy of the scale value thus obtained is about one thousandth. It is suggested that the scale value might vary secularly. In order to determine the gravity value at every station included in a gravity survey network with the accuracy of 0.1 milligal, it is necessary to establish some pendulum stations in the network, and to adjust the net making the scale value to be unknown.
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  • Anomalies in ∂g/∂z
    C. TSUBOI
    1955 Volume 2 Issue 1 Pages 21-26
    Published: July 30, 1955
    Released on J-STAGE: July 05, 2011
    DOIhttps://doi.org/10.11366/sokuchi1954.2.21
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    ∂g/∂z is usually taken to be 3086×10-9, but this value varies from place to place in accordance with the variation in δg varies as
    the corresponding variation in ∂g/∂z is given by
    and often becomes too large to be neglected. Fig . 2 shows the distribution of δ(∂g/∂z) in U.S.A. as calculated from Δg0″ by means of the above formula.
    In order to know the precise value of δ(∂g/∂z) at a particular point, the following formula is suggested:
    where Δg(r) is the mean value of vg taken along a circle i=i drawn around the point in question and R is the distance up to which Δg(0)-Δg(r)may be regarded as varying as ar2
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  • A Method of Calculating the Second Derivatives of the Potential from Gravity Anomalies
    Minoru TAZIMA
    1955 Volume 2 Issue 1 Pages 27-30
    Published: July 30, 1955
    Released on J-STAGE: September 07, 2010
    DOIhttps://doi.org/10.11366/sokuchi1954.2.27
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    C. Tsuboi derived with the aid of BESSEL FOURIER Series the formulae of the first derivatives of the gravity potential for calculating the deflections of the vertical. The method was generalized and the formulae for the second derivatives were derived, by the aid of which the relation of the geomagnetic anomalies to the gravity anomalies, and the local undulation of the geoid were discussed briefly.
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  • Mean Density of Mt. Fuji as Determined from the Intensity of Gravity at its Summit (I)
    Naoiti KUMAGAI, Etsuo ABE
    1955 Volume 2 Issue 1 Pages 31-37
    Published: July 30, 1955
    Released on J-STAGE: July 05, 2011
    DOIhttps://doi.org/10.11366/sokuchi1954.2.31
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    By revising the data used by MENDENHALL and by following his method in which the shape of the Mt. Fuji is assumed to be a circular cone, the authors obtain in this paper that the mean density of the mountain as considered from the gravity at the summit is 1.80 or 1.83, according as the gravity station is taken at a point S1 or at another S2, as against 2.08 obtained by MENDENHALL. In order to carry on a further inquiry, the authors first make an approach of employing the actual form of the mountain as exactly as possible and obtain Am=105.37ρ or 105.02ρ mgal as the vertical attraction of the mountain at S1 or S2 respectively, where ρ is the mean density under consideration. In finding the value of Am from the gravity value at the summit, the effect of the subsurface anomalous masses due to geological structure and isostasy has to be taken into consideration and this will be reported in the next occasion.
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  • [title in Japanese]
    [in Japanese]
    1955 Volume 2 Issue 1 Pages 38-39
    Published: July 30, 1955
    Released on J-STAGE: September 07, 2010
    DOIhttps://doi.org/10.11366/sokuchi1954.2.38
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1955 Volume 2 Issue 1 Pages 39-45
    Published: July 30, 1955
    Released on J-STAGE: September 07, 2010
    DOIhttps://doi.org/10.11366/sokuchi1954.2.39
    JOURNAL FREE ACCESS
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