166 Ocean Magnetic Observations, 1905-16 



was rendered by Commodore Karl Rohrer, of the United States Naval Station. The 

 Carnegie left San Juan, Porto Rico, for Para, Brazil, where she arrived September 24, 1910, 

 having encountered unusually favorable conditions for magnetic work. Upon completion 

 of the shore work at Pinheiro, the magnetic station near Para, the Carnegie left on October 

 15, 1910, and arrived at Rio de Janeiro, Brazil, December 2, 1910, the voyage having been 

 made under very favorable observing conditions. Intercomparisons of barometer stand- 

 ards were carried out at the Rio de Janeiro Observatory through the courtesy of Director 

 Morize, who also rendered the Carnegie's scientific staff valuable aid in other ways. 

 Upon the completion of the usual harbor intercomparisons of land and ship instruments and 

 swing observations on December 23 and 24, the Carnegie sailed on December 29 for Monte- 

 video and Buenos Aires. (For view of shore work at Rio de Janeiro, see PI. 19, Fig. 1.) 



No land observations were made at Montevideo, at which place the Carnegie arrived 

 on January 14, 1911. After a short delay by storm she proceeded to Buenos Aires, arriving 

 there January 17. The observing conditions between Rio de Janeiro and Buenos Aires 

 were very good, and numerous observations were obtained. The comparisons of ship and 

 land instruments, as well as the comparisons of the Argentine magnetic standards with 

 those of the Department, were carried out at the magnetic observatory of the Meteorological 

 Service of Argentina at Pilar, Cordoba. Barometer comparisons were also made at the 

 office of the Meteorological Service in Buenos Aires. Acknowledgment is made here of 

 the cordial cooperation and effective aid received from Director W. G. Davis and the 

 observer-in-charge at Pilar, L. G. Schultz. 



The Carnegie sailed from Buenos Aires on February 14; but on account of adverse 

 winds and tidal conditions, together with the loss of an anchor, subsequently recovered, 

 she did not get out of the Rio de la Plata into the open sea until the 21st. Owing to this 

 delay and to foggy weather in the vicinity of Tristan da Cunha, it was found impracticable 

 to stop at this island, as had been planned, so that practically a great-circle course was 

 followed between Buenos Aires and Cape Town. This portion of the cruise was very 

 successful and numerous magnetic observations were made, despite the foggy conditions 

 prevailing during a part of the time. Cape Town was reached March 20. Intercompari- 

 sons of the land and sea instruments, as well as comparisons with the magnetic outfits of 

 Professors J. C. Beattie and J. T. Morrison, were secured at Valkenberg, near Cape Town. 

 Barometer comparisons were made with the standards of the Royal Observatory, Cape of 

 Good Hope. At Cape Town Dr. H. M. W. Edmonds, surgeon and magnetician, and 

 Observer H. F. Johnston joined the vessel. Dr. C. C. Craft, who had been surgeon and 

 magnetic observer on board the Carnegie since the initiation of her work, was relieved of 

 sea duty at Cape Town to return to the Office, owing to the impaired condition of his eyes. 



Upon the completion of the observations at Cape Town, where Doctors Beattie, 

 Dodds, and Hough rendered much valuable aid, the Carnegie left for Colombo on April 26, 

 arriving there June 7, 1911. The course from Cape Town was made for St. Paul Island, 

 and thence directly for Colombo. This passage of the cruise was accomplished with 

 cloudy weather and heavy seas during the easterly course, and under fine conditions during 

 the northerly course. Observations were made nearly every day. At Colombo the 

 Dii'ector joined the vessel for the purpose of a general inspection trip, for consultation with 

 the commander as to the details of the work, and for discussion regarding such alterations 

 as might be deemed advisable for further improvement. Observer E. Kidson, who had 

 been on duty aboard the Carnegie since the initiation of her work in 1909, was reheved 

 at Colombo of sea duty, and directed to proceed at once to Australia, there to take up 

 magnetic-survey work on land. Numerous courtesies were extended to the Carnegie 

 staff by the oflBcials at Colombo. 



Having completed the intercomparisons of the land and sea instruments at Colombo, 

 and of the barometric standards at the Meteorological Observatory, the Carnegie set sail 



