170 Ocean Magnetic Observations, 1905-16 



At the various ports of call the Carnegie's scientific staff received most cordial assist- 

 ance from various diplomatic and consular officers besides fi'om those already mentioned. 



Besides the usual observations for geographic position and of the magnetic elements, 

 atmospheric-electric observations, as opportunity afforded, were made on the Carnegie by 

 Observers Kidson and Johnston. Atmospheric-pressure observations have been carried 

 out and various improvements in the method of observations were effected. Observations 

 for atmospheric-refraction effects at sea were also made. 



The total length of Cruise II was 92,829 nautical miles; the time at sea (not counting 

 stops at ports) was 798 days; hence, the average day's run was 116 miles. (See abstracts 

 of log, pp. 333-347, and summary, p. 347.) 



CRUISE III. JUNE TO OCTOBER 1914. 



Upon the return of the Carnegie from her long cu-cumnavigation cruise (Cruise II) 

 arrangements were promptly made for the necessary repairs, requu-ed chiefly on account of 

 dry rot. At the same time some alterations in the interior arrangements of the vessel were 

 made. The stone ballast, previously used, was replaced by lead ballast. The refrigerating 

 plant, oil engine, and producer-gas engine were also overhauled, and some improvements 

 were effected. The repairs and alterations were made at Hoboken, New Jersey, by Tietjen 

 and Lang, under the direct supervision of W. J. Peters, as representative of the Department 

 of Terrestrial Magnetism. 



Meanwhile, plans had been made for a cruise, under the charge of W. J. Peters, chief 

 of party, to Hudson Bay in a chartered vessel, the George B. Cluett, belonging to the Grenfell 

 Association. Accordingly, on June 1, 1914, the command of the Carnegie was transferred 

 to J. P. Ault, who has carried out the cruises of the vessel since that date. 



After the Du-ector had made his inspection of the vessel, and had given the final 

 instructions regarding the cruise and the program of work, the Carnegie left Brooklyn, on 

 June 8, 1914, du-ect for Hanmierfest, Norway, with the following personnel aboard: J. P. 

 Ault, magnetician and in command of vessel; H. M. W. Edmonds, magneticiau and sur- 

 geon; H. F. Johnston and I. A. Luke, observers; N. Meisenhelter, meteorological observer 

 and clerk; R. E. Storm, mechanical engineer; J. Sahlberg, J. Johnson, and T. Pedersen, 

 watch officers; C. Heckendorn, mechanic; 8 seamen, 2 cooks, and 2 cabin boys; 22 persons 

 in all. Martm Clausen, who had served faithfully and eflficiently, first as third and later as 

 second and first watch officer on the previous cruises, on May 17, durmg shore leave, unfor- 

 tunately met with an accident, and died on May 24. On May 27 John Sahlberg was 

 appointed first watch officer in his stead. 



From Brooklyn, the Carnegie followed a course practically due east along the parallel 

 of 41° north to about 53° west longitude, and thence practically in a direct Une to Hammer- 

 fest. A landfall was made in the vicinity of the Faroes on June 27. Hammerfest was 

 reached on July 3, after a cruise of 4,152 nautical miles. In addition to the usual stations 

 occupied at Hammerfest for the purpose of determining the instrumental constants, 

 observations were secured in the neighborhood, at five additional stations, for the purpose 

 of selecting a suitable place in the harbor to swing the vessel, and thus test anew the 

 absence of ship deviations at the mounts of the magnetic instruments. Swings of vessel 

 were secured on July 15, 16, and 18, with satisfactory results for both horizontal mtensity 

 and inchnation, as also for decUnation, due account being taken of the small horizontal 

 intensity (0.1 c. g. s.) at this high magnetic latitude. These tests showed once more, 

 as in the previous cruises, that there are no deviations of sufficient magnitude to be taken 

 into account. (See PI. 16, Figs. 2 and 3, and PI. 19, Fig. 3.) 



On July 25 the Carnegie left Hammerfest, bound this tune for Reykjavik, Iceland, the 

 commander's instructions being to proceed as far north as ice conditions permitted, without 



