DEPARTMENT OF TERRESTRIAL MAGNETISM. 321 



inclination and horizontal-intensity observations were made at 48 

 stations. On May 31 the vessel was swning for declination observa- 

 tions under fairly good conditions, the maximum rolling being 5° to 

 starboard and 8° to port, and the ranges in the results were no larger 

 than the indicated error of observation, 5' in the collimator results and 

 9' in the deflector. 



After official calls on the American consul and on the governor, 

 arrangements were made for the work to be undertaken at the Samoa 

 Observatory. The comparison of standards at the Observatory with 

 those of the Carnegie was begun on June 30, after consultation with 

 Mr. C. J. Westland, at present in charge of the Observatory, and with 

 the former director, Dr. Angenheister, who left Apia on July 2 to 

 return to his native country. Plans regarding continuance of the work 

 in atmospheric electricity and regarding the past work and methods 

 were discussed with Dr. Angenheister and Mr. Westland. Upon 

 cabled authority from the Office, and since some of the observatory 

 apparatus was in poor condition, certain appliances for atmospheric- 

 electric work were transferred from the ship to Dr. H. M. W. Edmonds 

 for use at the Apia Observatory while he is stationed there (see p. 312). 

 A magnetometer, typewriter, and other equipment were also left at 

 the Observatory for Dr. Edmonds's use, as may be found necessary. 



For facilitating the comparisons at the Apia Observatory, two new 

 outside stations were established, as the outside pier heretofore used 

 for intercomparison work was found to be constructed of magnetic 

 material. All ship instruments were also standardized. With the 

 cordial and effective cooperation of Mr. Westland and of Dr. Edmonds, 

 the large amount of observational work was satisfactorily completed 

 and the Carnegie sailed for the Canal Zone on July 25. 



It was necessary to depart from the track originally planned in 

 order to land Dr. Pemberton for medical treatment at Avarua, Raro- 

 tonga Island, and allow him to return home. The vessel left Raro- 

 tonga on August 15 and arrived at Balboa October 7. The Carnegie 

 tracks of earlier cruises were crossed 12 times and the Galilee track of 

 1908 was crossed once. These intersections will yield important 

 secular-variation data. A reversal of the usual currents was noted in 

 the Gulf of Panama, the set being toward the south instead of to the 

 north. Excellent results were obtained during the frequent observa- 

 tions of diurnal variation in atmospheric electricity. The average 

 daily run was 123 miles for the 72 days between Apia and Balboa. 



Secular-variation observations were made at Colon, and after 

 drydocking at Balboa the Carnegie proceeded through the Canal and 

 set sail on October 20 for Washington on the last passage of Cruise VI. 



A favorable southeast wind enabled her to make excellent headway 

 towards Windward Passage, through which she ran on October 25 

 and 26 in a calm. Gales, or strong winds, then prevailed to Novem- 



