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according Aktivität amplitude appear approximately atmospheric August average Bauer beginning Carnegie chart Cheltenham Chree Coast and Geodetic Committee Contains continued correction corresponding currents curves dass declination Department of Terrestrial determinations direction Director disturbance diurnal Earth east effects eine electric Erde Figure force Geodetic Survey give given Greenwich horizontal intensity hourly increase Institution International Jahre July June latitude London longitude magnetic observations Magnetic Observatory magnetic storm magnetische March Mass maximum mean meridian Meteorological Methode minutes Nature normal observations obtained Office period positive possible present range readings record region scale showed solar eclipse stations Table Terr Terrestrial Magnetism tion Union United values variation vertical Washington wave Werte wind Zeit
Page 39 - SPECIAL magnetic and allied observations will be made at certain stations inside and outside the shadow belt of the total solar eclipse of May 29, 1919...
Page 36 - Sobral, which, briefly stated, are:5 a. The potential gradient showed a well-formed minimum beginning with totality and extending until about 20 minutes after totality; the values observed during this period were about 20% lower than the mean derived from two equal periods immediately preceding and following it.
Page 14 - This particular variation is termed here the "solar-eclipse magnetic variation." (6) The range of the solar-eclipse magnetic variation, according to the particular magnetic element, is about 0.1 to 0.2 that caused by the solar-diurnal variation on undisturbed days. The effects are of a more or less complicated character, according to location of observation-station in the zone of visibility. The effects caused during the local eclipse-interval are superposed upon those caused by the continued disturbance...
Page 129 - President of the Section of Terrestrial Magnetism and Electricity of the International Geodetic and Geophysical Union, and also of the corresponding Commission of the International Meteorological Committee.
Page 105 - That the Section of Terrestrial Magnetism and Electricity would welcome cooperation with the International Union of Scientific Radio-Telegraphy in the investigation of the electric phenomena of the higher atmosphere. IV. That a committee be appointed on the systematic exchange of magnetic curves. V. That special committees be appointed from time to time for the investigation and report on specific problems...
Page 104 - According to the method of organization and the interpretation put upon the office of secretary, it is expected that the affairs of the unions and sections, between the triennial meetings of the General Assembly, will be largely conducted by the respective secretaries, as is the case also with regard to the general secretaryship of the International Research Council, to which Professor Arthur Schuster was reelected.
Page 180 - Organization, and Conditions of Membership of the various Societies, and forming the groundwork of the Series, may still be had, price 7/6.
Page 104 - To assist in carrying out the objects of the International Geodetic and Geophysical Union, which are: To promote the study of problems concerned with the figure and physics of the Earth; to initiate and coordinate researches which depend upon international cooperation, and to provide for their scientific discussion and publication; and to facilitate special researches, such as the comparison of instruments used in different countries.
Page 31 - Such inequalities are evidently not met with in the attractions of the Sun and Moon on the waters of the...
Page 104 - The Executive Committees of the Sections were for the present limited to the president, vice-president, and secretary, excepting in the case of (e) (Physical Oceanography), where Sir Charles Close (British Ordnance Survey) and Mr. GW Littlehales (US Hydrographic Office) were made additional members of the executive committee of that section. The officers of the Union are: President, M. Charles Lallemand (director, Leveling Service, France); general secretary, Colonel HG Lyons (Army Meteorological...