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  • Articles  (8,961)
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  • 1945-1949  (8,961)
  • Geosciences  (8,961)
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  • Articles  (8,961)
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  • 1
    Electronic Resource
    Electronic Resource
    AN INVESTIGATION INTO THE CAUSES OF THE ANNUAL VARIATION OF MEAN SEA-LEVEL IN THE NORTH SEA (1947)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 5 (1947), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: A study of the Tidal records for North Sea ports reveals, for each port, an annual variation. The maximum occurs in the late autumn (usually in November) and the minimum in the spring (usually in May). The main factors causing this variation are (i) seasonal changes in the strength of the prevalent winds, (ii) seasonal changes in the density of the water. The magnitudes of these effects are obtained. The results show that there is an annual variation in the “calm” level of the North Sea, varying from 8 cm. in the Northern half to some 15 cm. in the Southern half.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1947.tb00350.x
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  • 2
    Electronic Resource
    Electronic Resource
    FEATURES OF THE TRAVEL-TIME CURVES OF SEISMIC RAYS (1945)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 5 (1945), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: A method is given of deriving the main features of the seismological travel-time tables from various assumed forms of the ray velocity variation. Attention is drawn to the utility of the functions dΔ/dp/dΔ and Σ in this connection. Attention is also drawn to the utility of the approximate formula v = arb which is both simple in application and gives very accurate results in parts of the Earth's interior, notably the region between the crustal layers and the level reached by rays for which Δ= 20°.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1945.tb06828.x
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  • 3
    Electronic Resource
    Electronic Resource
    ON THE NATURE OF THE EARTH'S CORE (1949)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 5 (1949), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: In a previous paper (M. N., 108, 406, 1948) the author has suggested that the density jump at the boundary of the Earth's core is duc to a phase transition under pressure, and not to the appearance of a new material such as iron. A metallic type of structure was proposed for the material in the core. In the present paper the transition to the metallic phase is explained in greater detail. Seismological data are used to prove that the core cannot be composed of either iron or an alloy of nickel and iron. It is shown how the theory removes certain difficulties arising from the hypothesis of an iron core, and how it can account for features not hitherto explained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1949.tb02956.x
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  • 4
    Electronic Resource
    Electronic Resource
    ON THE ABSOLUTE MEASUREMENT OF GRAVITY (1949)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 5 (1949), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: A simplified method is given for finding the corrections for bending and stretching of a pendulum used for making an absolute determination of gravity. It appears that the correction given by Clark is incorrect and that the value of g for Teddington consequently needs an increase of about 1.7 mgal. Examination of several minor corrections mentioned by Heyl and Cook for the Washington determination shows that they mount up and that the value given by these authors also needs an increase of about 1.5 mgal. When taken in conjunction with the relative determination by Bullard and Browne, the revised values give a discrepancy of 4.7 ± 1.6 mgal., which is large enough to need attention. An independent determination is desirable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1949.tb02955.x
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  • 5
    Electronic Resource
    Electronic Resource
    ON THE CONSTITUTION OF VENUS (1949)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 5 (1949), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: The constitution of Venus is discussed in the light of the density-pressure hypothesis stated by W. H. Ramsey. It is shown that on this theory, an increase in the precision of observations of the diameter of Venue can lead to a useful test on the question of the chemical homogeneity of the Earth's mantle. ‘The bearing of the writer's compressibility-pressure hypothesis on the density distribution in Venus is discussed. Values of the density and pressure in Venus are also given on the older hypothesis that the Earth's mantle and core are composed of chemically distinct materials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1949.tb02957.x
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  • 6
    Electronic Resource
    Electronic Resource
    THE ELECTRICAL AND MAGNETIC EFFECTS OF TIDAL STREAMS (1949)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 5 (1949), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: The tidal movement of sea water relative to the Earth's magnetic field induces electromotive forces of a few millivolts per kilometre. Recent measurements off Plymouth show that the potential gradient is at right angles to the streams in that part of the English Channel. Observations on cross-channel telephone cables indicate that a considerable flow of electric current takes place, which can be accounted for b assuming the mean conductivity of the sea-bed to be of the order of 6 × 10-5 (ohms-cm.)-1. Tidally generated earth-currents spread into the land on either side of the Channel and have been measured near Lulworth. It may be possible to use them for the measurement of tidal stream velocities.In the second part of the paper the potential gradients generated by water flow in shallow channels of rectangular or elliptical section are examined. The horizontal gradient in the water is almost independent of vertical variations in water velocity but is affected critically by the depth of the channel and the conductivity of the channel-bed. The induced electric currents can be expected to extend to depths comparable with the width of the channel.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1949.tb02945.x
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  • 7
    Electronic Resource
    Electronic Resource
    THE MAGNETIC PROPERTIES OF THE THOLEIITE DYKES OF NORTH ENGLAND (1949)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 5 (1949), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: The magnetic profiles taken over various members of the tholeiite dykes of the North of England show that they possess abnormal magnetic polarization. Direct measurement of the residual magnetism gives a series of magnetic vectors which could arise from a magnetizing field in opposition to the present field. Minor deviations in direction can be explained by flow of the molten material below the Curie point of the magnetic content.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1949.tb02946.x
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  • 8
    Electronic Resource
    Electronic Resource
    THE MAGNETIC FIELD PRODUCED BY EARTH CURRENTS FLOWING IN AN ESTUARY OR SEA CHANNEL (1948)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 5 (1948), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Records made in the Clyde estuary of fluctuations of the Earth's magnetic field, and of simultaneous fluctuations in the horizontal potential gradients in the water, give a clear indication that the fluctuation in vertical intensity are largely due to a varying flow of electric current in the sea.Variations in the Earth current in the English Channel appear to produce appreciable fluctuations in vertical intensity at the magnetic observatory at abinger.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1948.tb02941.x
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  • 9
    Electronic Resource
    Electronic Resource
    GEOMAGNETIC “CROCHET” OCCURRENCE AT ABINGER, 1936-46, AND ALLIED SOLAR AND RADIO DATA (1948)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 5 (1948), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: The rather infrequent occurrence at Abinger of geomagnetic “crochets” (ultra-violet solar radiation effect) has been studied over 11 years, in conjunction with data of solar flares and radio fade-outs. The trace movements in H, D and V of 23 examples are reproduced, in addition to tabulated data for these and for 32 other cases of less certain identification. The general synchronization of flare, fade-out and crochet (when present) is noteworthy. Comparison is made of the amplitude λH and direction λD of the crochets with the normal diurnal inequality of H and D. A striking feature is the change in direction from East to West in D at about 10h.7 apparent solar time, in conformity with the diurnal inequality in D. The correlation with the diurnal inequality in H is less obvious, but λH is of the correct sign (negative) over the range of daylight hours in which crochets occurred. There are indications of other diurnal and seasonal factors (other than a simple dependence upon the Sun's zenith distance) in the occurrence of crochets at Abinger. Some crochets in 1946 have synchronized with reported bursts of “solar noise”.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1948.tb02936.x
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  • 10
    Electronic Resource
    Electronic Resource
    THE ORIGIN OF THE NIGHT SKY LIGHT (1948)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 5 (1948), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Theories of the origin of the night sky light are discussed. It is pointed out that evidence from the absolute intensity, the altitude, the space and time variations, the correlations with magnetic activity, and the particular lines and bands appearing in the spectrum, indicates that the emission is not solely connected with the potential energy associated with the region of dissociated oxygen or with the ionized layers but partly arises from incident charged particles (such as produce aurorae). The suggestion is made that it is the action of the Störmer current that allows these particles to approach sufficiently close to the Earth at low latitudes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1948.tb02937.x
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