236 CARNEGIE INSTITUTION OF WASHINGTON. 



of the section. The principal assistance in this work was received from Mr. 

 H. F. Johnston. 



The reductions and analyses of the ocean data necessary in the preparation 

 of the manuscript above referred to emphasize that, in order to reap the full 

 benefit of the work already accomplished at sea, plans should be considered 

 to resume soon the ocean surveys of the Carnegie, and thus take advantage 

 of the remaining useful life of a vessel specially adapted for magnetic and 

 electric surveys at sea. In this connection attention may be called to the 

 following resolution, passed at the General Meeting of the Second Pan- 

 Pacific Science Congress, which was held at Melbourne and Sydney, Aus- 

 tralia, August 13 to September 3, 1923 : 



"That this Congress desires to place on record its appreciation of the 

 investigations, valuable to geophysicists and navigators, that have been 

 carried out on board the nonmagnetic survey yacht Carnegie, and expresses 

 the hope that it will be possible to continue this work by the magnetic explora- 

 tion of fresh ocean areas and by the determination of the secular variation of 

 the magnetic elements." 



Early in the year Mr. W. J. Peters, in command of the Hudson Bay 

 expedition of 1914, completed the reductions of the ocean magnetic observa- 

 tions and the manuscript of the report on that expedition; this article will be 

 published as a special report in the volume containing the final ocean magnetic 

 results secured aboard the Carnegie during 1915 to 1921, 



Observational and miscellaneous work. — The completion of the manuscript 

 for the final results of the ocean observations during 1915 to 1921 permitted 

 undertaking but a limited amount of other work. The ocean-current data 

 obtained during the six cruises of the Carnegie were tabulated and forwarded 

 to the United States Hydrographic Office for use in preparing a new chart on 

 ocean currents. 



The chief of the section, assisted by Mr. Johnston, made special magnetic 

 and electric observations at Point Loma, California, during the total solar 

 eclipse of September 10 (see p. 252) . Upon the completion of the observational 

 program at Point Loma, Captain Ault attended the Los Angeles meeting of the 

 American Association for the Advancement of Science and presented two 

 papers before meetings of sections B and D on (1) Magnetic results obtained 

 on the Carnegie during Cruises IV, V, and VI, 1915-1921, and (2) Effects of a 

 total solar eclipse on the Earth's magnetic and electric fields (see abstract, 

 p. 247). 



In connection with the study of the development of instruments for use in 

 aircraft, the chief of the section attended the December 1922 meeting in New 

 York City of the Aeronautic Division of the American Society of Mechan- 

 ical Engineers and took part in the discussion of the papers on air naviga- 

 tion. He presented a paper on air navigation before the Philosophical 

 Society of Washington (see abstract, pp. 246-247). 



LAND MAGNETIC SURVEY.^ 



Program for field observations of magnetic changes. — Field work has been 

 devoted chiefly to determining the changes taking place, both secular and 

 diurnal. Except for a few stations in Haiti and the Dominican Republic, 



1 From the report of the chief of section, H. W. Fisk. 



