REPORT OF THE PRESIDENT, 1918. 13 



Refitting during the winter of 1914-15, the Carnegie left the 

 base station just mentioned March 9, 1915, for a more extended 

 cruise (No. IV), which was expected to require about three years. 

 SaiHng down the west Atlantic and through the Panama Canal, 

 she left the Pacific port of Balboa April 12 and arrived at Hono- 

 lulu May 21. Stopping there for a few weeks for land work and 

 to swing ship, she arrived at Dutch Harbor, Alaska, July 20. 

 Leaving this port August 5, she made a long voyage of 89 days 

 and 8,865 miles in the western Pacific to Lyttleton, New Zealand, 

 without stopping at any intermediate point. After an interval 

 of 33 days for shore work and for refitting, she left Lyttleton 

 December 6 for a circuit of the south polar region, mainly be- 

 tween the parallels of 50° and 60° south latitude. This circuit 

 was completed April 1, 1916, in 118 days, the total distance 

 traversed being 17,084 miles. It is remarkable that a long voy- 

 age in this stormy region should have proved highly successful. 

 Although precipitation was recorded on five-sixths of the days, 

 magnetic decUnations (variations) were observed on every day 

 but one, while magnetic dip and intensity (or strength of the 

 earth's field) were observed on every day. Errors in magnetic 

 variation given by the best saihng charts previously published 

 were found to be as great for some places as 12° to 16°. 



After a stay at Lyttleton for instrumental comparisons at 

 Christchurch Magnetic Observatory and for overhauling and 

 refitting, the Carnegie left this port May 17, 1916, for Pago Pago, 

 Samoa, where she arrived June 7. Thence she sailed June 19 for 

 Port Apra, Guam, which was reached July 17, and thence to San 

 Francisco, where she arrived September 21, the courses having 

 been arranged to intersect, as frequently as practicable, the pre- 

 vious courses of the Galilee and the Carnegie. After a stay of 

 five weeks at San Francisco, the ship set sail November 1, 1916, 

 bound for Easter Island, which was reached December 24. 

 Thence, on January 2, 1917, she set out for Buenos Aires by way 

 of the eastern Pacific, making a large loop intersecting the earher 

 voyages in the central Pacific at many points. No stops were 

 made. Cape Horn was rounded February 17, and the harbor of 



