DEPARTMENT OF TERRESTRIAL MAGNETISM. 319 



strumental difficulties, the radioactive content was measured on 3 days 

 only. The other four atmospheric-electric elements were observed on 

 21 days, and diurnal- variation observations were attempted on 6 days, 

 on 3 of which weather conditions prevented a complete series. 



At San Francisco the vessel was dry-docked, and such general repairs 

 as found necessary on examination were made. Because of the short 

 cruise planned before the return to Washington, when the vessel 

 probably will have to be opened up for careful examination and 

 possibly extensive repairs before going out again, it was decided to 

 copper-paint instead of resheathing the hull. The electric generator 

 was replaced by a 2-kilowatt generator, in order to make more ade- 

 quate provision for the experimental work. 



Advantage was taken of the delay occasioned by the repair work 

 to obtain complete standardizations of the ship's magnetic instruments 

 at a new station. Fort Scott; the old station on Goat Island was found 

 no longer suitable. Complete intercomparisons between substandard 

 magnetometer-inductor No. 26, which had been brought especially 

 for this work from Washington by Mr. Fleming, and the ship's 

 standard land-instruments were also made at Fort Scott. The results 

 showed that the corrections for the ship's equipment had remained 

 nearly constant. 



Dr. J. C. Merriam, President of the Institution, made a personal 

 inspection of the Carnegie on March 24. 



The chief of the Magnetic Survey Division (Mr. Fleming), represent- 

 ing the Director, made an inspection of the vessel during February 24 

 to March 7, while she was in San Francisco, and took up various urgent 

 matters with Captain Ault relating to instruments, equipment, and 

 future work. 



Upon the completion of the other shore work capacity determinations 

 were made for the conductivity apparatus, the radioactive content 

 apparatus, the ionic-content apparatus, and the penetrating-radiation 

 apparatus. 



The repair work and other business matters being completed, the 

 Carnegie left the dock at 4 p. m. on March 28 and sailed direct for 

 Honolulu. During the entire passage observing conditions were good 

 and permitted dechnation observations twice every day, except on 

 April 1, when cloudy weather prevented them. Winds were moderate 

 to fresh and favorable all the way. As the Hawaiian Islands were 

 approached, the wind became quite strong and a very heavy current 

 from the south was found in Kaiwi Channel, between Molokai and Oahu 

 islands. The vessel arrived off Honolulu Harbor early on April 12 

 and was alongside the dock at 8^ 40™. 



The distance traversed was 2,222 miles, giving an average of 151 

 miles per day for the 14.7 days of the trip. Magnetic observations were 

 obtained at 27 stations for declination and at 14 stations for inclination 



