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- Volume 7, Issue 4, 1959
Geophysical Prospecting - Volume 7, Issue 4, 1959
Volume 7, Issue 4, 1959
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A EUROPEAN FIELD OF THE NORMAL GEOMAGNETIC VERTICAL INTENSITY AND ITS SECULAR VARIATION
By R. BOCKSummaryA uniform field of the normal geomagnetic vertical intensity and its normal dependence on the first and second powers of latitude and longitude are derived for Europe and represented by sketches. The epochs of 1938.5, 1941.5, 1944.5, 1947.5, 1950.5, 1953.5, and 1956.5 have been chosen.
It is suggested that anomalies of the vertical intensity should be given according to this field in order to obtain, in course of time, a coherent image of the magnetic effects of the European continent.
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OPTICAL ANALOGUE OF GRAVITY AND MAGNETIC FIELDS
By AMALENDU ROYAbstractGravity anomalies due to given mass distributions have been determined by model optical experiments, which utilise the fact that both the light intensity and the gravitational field due to point sources obey the Inverse Square law. The technique is somewhat different from that used by Gerrard et al (1957), and the results seem to be more accurate (maximum discrepancy 2 percent). The applicability of the anology for the determination of magnetostatic fields is also pointed out.
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SOME OBSERVATIONS OF GAMMA RADIATION EMITTED BY A MINERAL SPRING IN JAMAICA
More LessAbstractThe decay rate of gamma radiation emitted by a Jamaican mineral spring was measured using portable rate meters. The results of these experiments, supported by auxiliary tests, suggested that the main radioelement causing the radioactivity was radon 222. Fluctuations in the intensity of the radiation were studied in situ. An inverse relation between the intensity and the discharge rate of water was established and the effect of rainfall and of earthquakes was investigated. Some suggestions are made concerning the possible source of radon.
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BOOK REVIEW
Book Reviewed in this article:
The Earth and its Gravity Field, W. A. Heiskanen and F. A. Vening Meinesz.
KRAUS, HUNT and RAMSDELL, Mineralogy.
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Volume 8 (1960)
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Volume 7 (1959)
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Volume 6 (1958)
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Volume 5 (1957)
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Volume 4 (1956)
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Volume 3 (1955)
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Volume 2 (1954)
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Volume 1 (1953)