316 CARNEGIE INSTITUTION OF WASHINGTON. 



On the basis of the information in the British printed report/ we have made 

 an independent reduction of the photographic measures resulting from 

 Crommehn's plates. 



The non-radial effects, as resulting from our calculations, are found to be 

 on the average about one-third of those derived from the British printed 

 results and as given in the seventh column of Table II of the article in 

 Science of June 11, 1920 (see page 583); in brief, our non-radial effects are on 

 the order of the error of observation, so that they may be regarded as non- 

 existent until other observational evidence is obtained. 



Comparing the revised radial-Ught deflections resulting from all reductions 

 with those computed on the basis of the Einstein theory of gravitation, it 

 is found that generally the observed deflection is greater than the theoretical 

 value. 



Star 11, the most distant star, according to the British reductions showed 

 a deflection agreeing better with the value calculated on the basis of the 

 Newtonian mechanics, but it now shows a deflection agreeing better with 

 the Einstein value. In brief, the results of all reductions would lend addi- 

 tional support to the conclusion reached by the British astronomers, namely, 

 that, as judged by their best photographic plates, the light deflections 

 observed during the solar eclipse of May 29, 1919, accorded better with the 

 calculated values on the basis of the Einstein theory than on the basis of 

 the Newtonian mechanics. 



The scientific work carried out in the Pacific Ocean by the Department of Terrestrial 

 Magnetism of the Carnegie Institution of Washington. L. A. Bauer. (Pre- 

 pared for the First Pan-Pacific Scientific Conference, held at Honolulu, 

 August 2-20, 1920.) 



Cruises — During the period August 1905 to May 1908, three cruises were 

 made on the chartered brigantine, the Galilee, aggregating about 64,000 

 nautical miles. The aggregate length of the cruises made on the specially 

 constructed non-magnetic vessel, the Carnegie, at various times between 1912 

 and 1918, is about 85,000 nautical miles. During the present cruise of the 

 Carnegie she will traverse in 1920-21 about 27,000 nautical miles in the Pacific 

 Ocean. Accordingly, the total length of the cruises of the Galilee and the 

 Carnegie, between 1905 and 1921, will be about 176,000 nautical miles, cover- 

 ing the Pacific Ocean between the parallels of 60° north and 60° south. 



Observational work. — The observational work comprises chiefly the subjects 

 of terrestrial magnetism, atmospheric electricity, and atmospheric-refraction 

 observations. In addition, however, such auxiliary observations are made 

 as available time permits, for example, meteorological observations, examina- 

 tion of the radioactive content of the atmosphere, experimental investigations 

 pertaining to possible gravimetric observations, special oceanic phenomena, etc. 



The magnetic observations at sea comprise the determination of the 

 magnetic declination, the dip of the magnetic needle, and the strength of the 

 Earth's magnetic field. Furthermore, from the intersections of cruises made 

 at various times, the changes in the magnetic elements are determined in 

 order that the necessary corrections may be applied to current magnetic 

 charts. Similar observations are made at all ports visited by the vessel. 



Results. — The methods of observation used have reached such a state of 

 perfection that it is possible to make magnetic observations at sea almost 



* "A Determination of the Deflection of Light by the Sun's Gravitational Field from Observa- 

 tions made at the Total Eclipse of May 29, 1919," by Sir F. W. Dyson, F. R. S., astronomer royal; 

 Profes.sor A. S. Eddington, F. R. S., and Mr. C. Davidson. Phil. Trans. R. S., London, Ser. A, 

 vol. 220, pp. 291-333. 



