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Published through the yankee Geophysical Union as a part of the History of Geophysics Series

It has been famous upon a number of events that the History of Geophysics volumes may possibly do good to introduce to new generations of readers a few of the early occasions of our association, the yank Geophysical Union, and of what could be thought of to be its first magazine, Terrestrial Magnetism (which later turned the well known Journal of Geophysical Research). Following the feedback of my friends, this quantity starts off the perform of together with a few "early" articles, either approximately heritage of geophysics and in regards to the background of AGU. For this quantity i've got chosen fabrics taken from the founding of Terrestrial Magnetism in 1896 as much as the beginnings of worldwide conflict I. for instance, Sir Edmond Halley's isogonic "Atlantic Chart" of 1701 units Halley's cartographic paintings except all past extant charts and it really is one of many "most vital maps within the heritage of cartography. The Atlantic Chart was once misplaced for over a century till it used to be rediscovered through L. A. Bauer and reproduced within the first factor of Terrestrial Magnetism. Halley's isogones he himself referred to as "curve lines". They have been commonly known as "Halleyan" traces till Christopher Hansteen coined the time period "isogone" approximately 1820. different early articles i've got selected for replica right here comprise biographical fabrics on Sir William Gilbert, and on Andrew Carnegie, the world's greatest deepest benefactor of geomagnetism and geophysics, and articles on terrestrial magnetism and earthquakes. a lot of those fabrics difficulty magnetism and have been written or edited via L. A. Bauer. this can be due partially to the character of the early years of Bauer's magazine and to Bauer's own pursuits. it truly is was hoping that destiny volumes of background of Geophysics will comprise reproductions of traditionally major articles representing extra disciplines in geophysics.

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PROFESSOR W. n of observations pertaining to the electric condition of the earth and of the atmosphere, even though this at present may be possible only to a limited extent. "As the principal electric problems \ve might name the determination of the strength of the Earth's electric field, the electric conductivity of the atmosphere (the so-called dissipation of electricity), and, the investigation of earth currents and the aurora. "Since these matters have been investigated only \vithin comparatively recent times, the methods of observation and of reduction and the theoretical utilization of the results are as yet very imperfect; nevertheless there is reason to hope that even with the present means, relationships between the electric phenomena of the atmosphere and the Earth's magnetic phenomen,a can be disclosed.

The -flow of ground water has many analogies to the flow of heat by conduction. We have exact analogies in ground water theory for thermal gradient, thermal conductivity, and specific heat. I think a close approach to the solution of some of our problems are probably already worked out in the theory of heat conduction. 00 Copyright 1985 by the American Geophysical Union Fig. 1. Reproduction of one of four pages of mathematical derivations sent to C. V. Theis by Clarence Lubin in 1935. 41 History of Geophysics: Volume 4 Eos, Vol.

13 21 or? Principal portion; Begins........ 9 13 23 ? " "Max............ 9 13 25 0ff ? off " " Ends . " f" hms 13 19 24 13 2 5 12 13 3 f 3 6 13 surface . ( along chord . medium path. 17 35 Ilms 13 19 2 o 13 2 5 1330 133 2 0 ff l 1335 J Latitude . 2I019/N. 57°03 1 N. 38°47"N. 38°441 N. 18°09/N. 5 20 30 'N. 5 I0 3 2'N. 47°5 2'N. 45°49' N'13 so541 N·139° 18'N. Longitude from Greenwich .. 153 04 W. 135 20 W. 95 10 W. 76 50 W. 65 26 \V. I 54 W. 9 57 E. 18 52 E. IS 59 E. 77 03 \V. 76 37 \V. Great Cir.

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