22 



Land Magnetic Obsebvations, 1914-20 



Table 5. Land Magnetic Observers, 1914-1920, 



1 Observers of the "Maud Expedition" (Amundsen Arctic Expedition). 



* Messrs. G. F. Dodwell, Kerr Grant, and R. S. Burdon of the Adelaide Observatory, South Australia. 



Of the Massachusetts Institute of Technology, Cambridge, Mass. < Chinese assistant observer. 



Of the University of Texas, Austin, Texas. 



Messis. R. Sutton and E. Waite Elder of the East End High School, Denver, Colorado. 

 7 Professor A. D. Ross of the University of Western Australia, Perth, Western Australia. 



The original computations of observations are all made by the observers them- 

 selves in the field. The observers have also frequently taken part in making the 

 final office-computations of one another's observations, but the chief burden of 

 the final computations has been borne by the following members of the office 

 personnel: J. P. Ault, C. R. Duvall, H. M. W. Edmonds, C. C. Ennis, H. W. 

 Fisk, J. A. Fleming, W. J. Peters, M. B. Smith, and Emma L. Tibbetts. Mention 

 should also be made of the efficient services rendered by the instrument-makers 

 of the Department in the construction and repair of field instruments and 



accessories. 



DISTRIBUTION OF STATIONS. 



Some idea of the extent of the land work represented in the Table of Results 

 may be obtained from the synopsis given in Table 6, showing the geographical 

 distribution of the stations occupied during the seven years 1914 to 1920. Data 

 have been secured on every continent, as also on numerous islands in the Atlantic, 

 Tndian, and Pacific Oceans, and, in cooperation with the "Maud Expedition" 

 (Captain Amundsen's Arctic Expedition). The work has been done chiefly in 

 Australasia, South America, and Africa. The stations occupied during the seven 

 years, as shown in Table 6. total 1,747 (1,661 primary and 86 secondary), an 

 average of about 250 per year. Of the primary stations, there are about 82 at 

 which the full program (declination, inclination, and intensity), for some reason, 



