OBSERVERS' FIELD REPORTS. 



The following reports, or extracts, will give some idea of the conditions under 

 which the various magnetic surveys and magnetic exploratory expeditions, con- 

 ducted during the period 1914-1920, have been accomplished. The world-wide 

 scope of the operations, as shown by the Summary (Table 6, p. 24), is further 

 indicated by these reports. The latter not infrequently contain information only 

 of special concern to the Department of Terrestrial Magnetism, and so they are 

 not always given in full as submitted by the observers. As the observers write 

 the reports themselves, their own particular achievements are necessarily mini- 

 mized. It is hoped that sufficient has been retained under each observer's report 

 to enable the reader to judge of the care, skill, courage, and thoroughness with 

 which the work was executed. The reports will be found to contain matter of 

 geographic interest and useful information for future explorers; they are arranged 

 alphabetically by observers' names. 



Each of the reports contains a table listing the names of the stations occu- 

 pied, together with dates of occupation and adopted latitudes and longitudes. 

 Detailed particulars describing the stations will be found in the section of this 

 Volume entitled "Descriptions of Stations" (pp. 223 to 348), where the arrange- 

 ment is alphabetical according to country. The magnetic data are given in the 

 Table of Results (pp. 30 to 97), where the arrangement of the stations under any 

 particular country is according to latitude. The localities at which observations 

 had been previously made by observers of the Department are printed in italics 

 in the tables accompanying the following reports. Typical views taken during 

 the progress of the various expeditions are given in Plates 1 and 3 to 7. 



D. W. Berky, on Magnetic Work Along the Araguaya and Tocantins Rivers in Brazil, 



March to September 1915. 



In accordance with instructions of March 2 and 3, 1915, I left Washington, D. C, 

 March 5, and sailed from New York March 6 on the Lamport and Holt Line steamship 

 Byron. The following instrumental outfit was carried: universal magnetometer No. 19 

 with dip needles Nos. 2 and 6 of this instrument and Nos. 1 and 2 of No. 21, 2 pocket 

 chronometers, 3 watches, observing tent and accessories. 



Upon arrival at Rio de Janeiro March 23, 1 called on Dr. Henrique Morize, in charge 

 of the Brazilian National Observatory, to consult with him regarding the proposed work. 

 Dr. Morize took a deep interest in the expedition, gathered valuable information 

 concerning the routes, and arranged for intercomparison of universal magnetometer 

 No. 19 with the Brazilian standards at the Magnetic and Meteorologic Observatory at 

 Vassouras. These comparisons were made between March 26 and April 1, and on the 

 3d of April one of the stations established in 1910 by the Carnegie was reoccupied. 

 Preparations having been completed at Rio de Janeiro, travel was resumed on April 8 via 

 Sao Paulo toward the northernmost rail terminus of southern Brazil. A station was 

 occupied at Araguary April 15, and on April 17 another was occupied at Catalao, the last 



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