DEPARTMENT OF TERRESTRIAL MAGNETISM. 295 



Results of comparisons of instruments for measuring the Earth's magnetic elements. Louis 

 A. Bauer and J. A. Fleming. Fhys. Rev., vol. 19, No. 4, pp. 427-428 (April 

 1922). 



This paper, presented by the first author before the December 1921 meeting 

 of the American Association for the Advancement of Science at Toronto, 

 gives a resume of intercomparisons of magnetic instruments at field stations 

 and observatories obtained by the Department of Terrestrial Magnetism 

 during 1905 to 1921. The resulting data, besides yielding information for the 

 correlation and reduction of magnetic observations made by existing organi- 

 zations, have yielded likewise results having important bearings upon the 

 principles and methods of magnetic measurements. In conclusion were given 

 the results of the comparisons at Washington, D. C, in 1921 between the 

 previously adopted standard magnetometer of the Department and the 

 recently constructed sine galvanometer, designed by Dr. Barnett, showing 

 satisfactory agreement in the values of the horizontal intensity obtained by 

 the two independent methods. 



Proposed magnetic and allied observations during the total solar eclipse of September 21, 

 1922. Louis A. Bauer and J. A. Fleming, Terr. Mag., vol. 27, 83-85 (March- 

 June 1922). 



Attention is called to the unusually good distribution of magnetic observa- 

 tories within the limits of the eclipse and on both sides of the belt of totality, 

 there being six observatories north and five observatories south of the belt of 

 totality, while there is one observatory located at points just before the 

 beginning and just after the ending of the eclipse. The general scheme of 

 work proposed is outlined, and includes magnetic, atmospheric electric, and 

 meteorological observations. The general circumstances of the eclipse are 

 given, as also the approximate local circumstances at seven points within the 

 belt of totality. (See also p. 279.) 



Report on the work of the Department of Research in Terrestrial Magnetism of the Carnegie 

 Institution of Washington to January 1, 1922. Louis A. Bauer and J. A. 

 Fleming. (Prepared for the Rome meeting of the International Section of 

 Terrestrial Magnetism and Electricity, May 1922.) 



This report summarized briefly the results obtained since 1904 by the De- 

 partment under four general headings: (1) "Magnetic survey," including 

 land, ocean, observatory, and special operations, (2) "Magnetic standards," 

 (3) "Instruments," including land, ocean, observatory, and special instru- 

 ments designed and constructed, and (4) "Publications." 



Note on magnetic standards and comparisons of the Department of Terrestrial Magnetism 

 of the Carnegie Institution of Washington. Louis A. Bauer and J. A. Fleming. 

 (Prepared for the Rome meeting of the International Section of Terrestrial 

 Magnetism and Electricity, May 1922.) 



This paper summarizes the work of the Department leading to the definition 

 of the provisional "C. I. W. magnetic standards" adopted for its data through 



1913 and of the provisional "international magnetic standards" adopted in 



1914 by the Department. A brief account is given of the numerous compari- 

 sons during 1905 to 1921 at observatories and at Washington between in- 

 struments of many types, the results of which justify, for all practical require- 

 ments, the provisional standards adopted. The vital question concerning 

 constancy of the standard instruments — C. I. W. magnetometer No. 3 and 

 inductor No. 48 — to which all comparisons are referred, is discussed and 

 evidence submitted showing their unusually consistent performance through- 

 out the period considered. 



