DEPARTMENT OF TERRESTRIAL MAGNETISM. 269 



secured between the instruments used and those of the magnetic obser- 

 vatory at Pilar, .\i'gentina. A further comparison was made at the 

 close of the work. 



MISCELLANEOUS WORK. 



In January 1917, Mr. H. R. Schmitt, while temporarily connected 

 with the Department, made a comparison of the inclination standard 

 of the Department with the observatory standard of the United States 

 Coast and Geodetic Survey at Cheltenham, Maryland. 



Magnetician H. W. Fisk, in September 1917, established a meridian 

 line on the aviation grounds at Langley Field, Hampton, Virginia, 

 and determined the magnetic elements at this station, as also at the 

 Coast and Geodetic Survey station at Hampton. 



In October 1917 Chief Observer W. J. Peters and Magnetician J. P. 

 Ault reoccupied the Coast and Geodetic Survey station at New Lon- 

 don, Connecticut, and established new stations about the outer harbor 

 at Ocean Beach, Fisher's Island, Great Gull Island, and Pine Island. 



ABSTRACTS OF PUBLICATIONS AND INVESTIGATIONS. 



Magnetic declinations observed on the Carnegie from Samoa to Guam and San Francisco, 



June-September, 1916. J. P. Ault. Terr. Mag., vol. 21, 175-176 (Dec. 1916). 



Washington. 

 Preliminary results of ocean magnetic observations on the Carnegie from San Francisco to 



Easter Island and Buenos Aires, Nov. 1916 — March 1917. J. P. Ault. Terr. 



Mag., vol. 22, 139-144 (Sept. 1917). Washington. 



These two papers by J. P. Ault, in command of the Carnegie, give the results 

 of the magnetic observations on the Carnegie and the chart corrections as 

 found for the period June 1916 to March 1917. Amplified results will be found 

 in the present annual report (see pages 256-264) . 



Some results of the ocean scientific work of the Department of Terrestrial Magnetism. 

 [Abstract.] L. A. Bauer. Pop. Astr., vol. 25, 308 (May 1917). Northfield, 

 Minnesota. 



This is an abstract of a paper presented before the combined meeting of 

 Section A, American Association for the Advancement of Science, and the 

 American Astronomical Society, held in New York, December 1916. For a 

 fuller account, see Terr. Mag., vol. 22, 129-134 (Sept. 1917). 



Remarks on the compass in aeronautics. L. A. Bauer. Proc. Amer. Phil. Soc, vol. 56, 

 255-257 (June 21, 1917). Philadelphia. 



These remarks were made as a contribution to the discussion aroused at the 

 Symposium on Aeronautics of the American Philosophical Society, at Phila- 

 delphia, on May 14, 1917. 



The recent great progress in aeronautical art and in the construction of 

 ships to navigate the air have called renewed attention to the importance of 

 perfecting the magnetic compass used in steering the craft. Just as in ocean 

 navigation, it has become necessary in aerial navigation, though not yet to 

 the same degree of refinement as in ocean work, to determine the effects on 

 the compass of the magnetic materials used in the construction and in the 

 equipment of the aircraft. The airship compass must, accordingly, be com- 

 pensated, and allowance for any outstanding errors must be made in steering 

 a course with it. 



