The Carnegie's Cruises, 1909-16 167 



on July 6, 1911, for Port Louis, Mauritius Island, with the Director aboard, arriving there 

 August 5, on schedule time. With the exception of a few days this portion of the cruise 

 was made under very favorable conditions. Valuable data, both with regard to the dis- 

 tribution of the magnetic elements and their secular changes, were secured, the course to 

 Mauritius being deflected to the southward in order to intersect the track of the Gauss. On 

 this portion, also, the 1911 track of the Carnegie northward to Colombo from St. Paul 

 Island was crossed, and thus valuable opportunity was afforded for testing the accuracy of 

 her work, as well as of the chart errors previously found. The results of these tests were 

 very satisfactory. Intercomparisons of land and sea instruments, as well as a valuable 

 intercomparison of the standards of the Department and those of the Royal Alfred Observa- 

 tory, were secured. Much interest was shown in the work of the Carnegie by the Governor 

 of Mauritius and other officials. Director Walter, of the Observatory, rendered valuable 

 aid in the instrumental comparisons. (See PI. 15, Figs. 1 and 2.) 



The land work being completed, the Carnegie left Port Louis, bound for Batavia via 

 Colombo, on August 16, 1911, the Director continuing with the vessel. A short stop was 

 made at Colombo, during September 10 to 15, and there the Dii-ector left the party to 

 visit magnetic organizations and observatories in India, the East Indies, and China. 

 Excellent conditions prevailed between Mauritius and Colombo, and numerous observa- 

 tions were made. After a 43-day cruise from Colombo, during which the desired observa- 

 tions were secured, Batavia was reached on October 27, 1911. The course from Mauritius 

 carried the vessel first to the westward of the Seychelles Islands into the western part of 

 the Arabian Sea, where the agonic line was located by two widely separated crossings, and 

 across the tracks of the principal steamship lines, thence back to Colombo, and from there 

 to Batavia. Intercomparisons of the sea and land instruments, as well as valuable inter- 

 comparisons of the standards of the Department and those of the Royal Meteorological and 

 Magnetic Observatory, were secured at Batavia, through the effective assistance of Director 

 van Bemmelen. (For view of work in atmospheric electricity, see PI. 15, Fig. 4.) 



From Batavia the Carnegie sailed on November 21, 1911, bound for Manila by a cir- 

 cuitous route, arranged so as to cover the eastern part of the Indian Ocean. The course 

 followed was south-southwest in the Indian Ocean to south latitude 30 ?8 and east longitude 

 89?4; thence it extended to 37?5 south, in east longitude 95?5. From this point a general 

 northeasterly course was followed into the China Sea and the North Pacific. The Carnegie 

 reached Manila, Philippine Islands, on February 2, 1912, having been out 73| days from 

 Batavia, and having covered a distance of 8,291 miles; the conditions for observations 

 were good. 



At the new Manila Magnetic Observatory, situated at Antipolo, intercomparisons of 

 magnetic instruments were made with the standards of the United States Coast and 

 Geodetic Survey and with those of the Antipolo Magnetic Observatory. These compari- 

 sons were much facihtated through the cordial cooperation of Director Algue of the Manila 

 Observatory and his chief assistant at the Antipolo Observatory, M. Saderra Mas6, and the 

 Director of Coast Surveys at Manila, P. A. Welker, at the time. Upon the completion 

 of the land work and of minor repairs in dry dock, the Carnegie left Manila on March 24, 

 1912, pursuing a northeasterly course off the Luchu Islands, and thence practically due 

 east to north latitude 30° and east longitude 166°. Thence the course was, in general, 

 southward to Suva, Fiji Islands, where the vessel, after having been considerably delayed 

 by head winds, arrived June 7, 75 days out from Manila. The total distance covered from 

 Manila to Suva was 8,158 miles. The track of the Galilee was crossed several times, and 

 thus valuable secular-variation data were obtained. Effective assistance was rendered the 

 Carnegie at Suva by various officials. 



Upon completion of the land work at Suva, including a reoccupation of the Galilee 

 station of 1906, the Carnegie left for Papeete, Tahiti, June 30, 1912. The departure 



