DEPARTMENT OF TERRESTRIAL MAGNETISM. 



283 



ABSTRACTS OF PUBLICATIONS AND INVESTIGATIONS. 



Preliminary results of ocean magnetic observations on the Carnegie from Apia to Balboa 

 and Washington, July to November, 1921. J. P. Ault, Terr. Mag., vol. 26, 

 121-128 (December 1921). 



This paper completes the series of papers giving the preliminary results of 

 the magnetic observations on the Carnegie during her recent world cruise 

 (No. VI), which began at Washington, on October 9, 1919, and ended at 

 Washington, November 10, 1921. Notes on the passages from Apia to Bal- 

 boa and from Balboa to Washington are given; in addition to the general 

 details of the passages, they include pertinent remarks regarding auxiliary 

 observations, determination of ocean currents, and a description of the "swing- 

 ing-ship" operations in Chesapeake Bay on November 7, 1921. The results 

 of these swings showed once more the absence of any appreciable magnetic 

 deviations at the positions where the various magnetic instruments are 

 mounted aboard the Carnegie. 



Preliminary average annual changes of the magnetic elements in the Pacific and Atlantic 

 oceans, 1906 to 1921. J. P. Ault. 



Table 2. — Preliminary average annual changes of the magnetic elements in the Pacific and 



Atlantic Oceans. 



" Units of the fourth decimal C. G. S. 



