ABSTRACTS 



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 this issue. 



GEOPHYSICS. — Researches of the department of terrestrial magnetism 

 (vol. II): Land magnetic observations, 1911-1913, and reports on 

 special researches. L. A. Bauer and J. A. Fleming; Carnegie 

 Institution of Washington Pub. No. 175 (Vol. II). 278 pages. 

 13 plates, and 9 text-figures. 1915. 

 The first portion of this publication contains the results of all mag- 

 netic observations made on land by the Department of Terrestrial 

 Magnetism from January, 1911 to the end of 1913. 



New magnetic instruments of light and portable types are described ; 

 these include two universal-magnetometer designs, viz., a combined 

 magnetometer and dip circle, and a combined magnetometer and earth 

 inductor. The stations at which magnetic observations were made be- 

 tween 1911-1913 ma}^ be summarized as follows: Africa, 207; Asia, 83 

 Australasia, 264; Europe, 38; North America, 48; South America, 247 

 Islands of the Atlantic Ocean, 16; Islands of the Indian Ocean, 14 

 Islands of the Pacific Ocean, 16; Antarctic Regions, 30; the total num- 

 ber of stations is thus 978. The table of results gives names of 

 stations, geographic positions, values of the three magnetic elements, 

 dates and local mean times of observations, references to instruments 

 used, and the initials of observers. From about 18 per cent of the re- 

 sults, data for the determination of the secular variation have been 

 obtained. Extended extracts from the observers' field reports are 

 given; following these are descriptions of the magnetic stations occupied 

 during the period of 1911-1913. 



The first special report describes in detail the newly-erected research 

 buildings of the Department at Washington. The second report is 

 devoted to L. A. Bauer's inspection trip of 1911, in the course of which 

 he visited various magnetic institutions, and to the observations secured 



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