The Carnegie's Cruises, 1909-16 169 



aboard. Observer Schmitt joined the Carnegie at this port in place of Observer Johnston, 

 who had been assigned to take charge of important land magnetic work in Paraguay, 

 Uruguay, Argentina, and Brazil. 



After completion of the land work, the Carnegie sailed from Bahia on May 19 for 

 St. Helena, following a south and east course to about 33° south latitude and 8° west 

 longitude, and sailing thence north to St. Helena, where she anchored off Jamestown, 

 June 23. On this passage considerable cloudy and stormy weather was experienced. 

 Complete intercomparisons of all instruments were now made ashore, and one magnetic 

 station of the Gauss expedition was reoccupied. The Governor of St. Helena (Major H.W. 

 Cordeau), at both visits of the Carnegie, evinced his interest and extended various courtesies. 



Leaving St. Helena on July 21, a north- northwest course was followed to about 30° 

 north latitude and 40° west longitude, and then north and northeast courses to Falmouth, 

 where the vessel arrived September 12. On August 15 and 18, magnetic observations were 

 obtained on 8 equidistant headings of the ship, the previous conclusions regarding absence 

 of appreciable ship deviations being again confirmed. 



During this passage from St. Helena to Fahnouth, the Carnegie on August 10 crossed 

 her track of 1909. A comparison of the two values of the magnetic dechnation obtained 

 at the point of intersection, one in 1909 and the other in 1913, showed that the north end 

 of the compass needle had shifted westward at an average annual rate of 7 minutes; this 

 is in the right direction to account to some extent for chart errors. A reliable value of the 

 secular change, derived from sea observations for an interval of not quite four years, can 

 only be obtained by means of the refined methods and instruments in use on the Carnegie. 



At Falmouth, besides the usual shore comparisons of instruments, the stations estab- 

 lished by the Carnegie during her first call at this port in October 1909, at Trefusis Point 

 and St. Anthony, were reoccupied for the purpose of determining the secular change in the 

 magnetic elements since 1909. For the same purpose magnetic observations were made at 

 the two nearest stations, Truro and Porthallow, of the Magnetic Survey of Great Britain 

 by Professors Rucker and Thorpe; thus additional data for connecting the latter survey 

 with the work of the Carnegie were obtained. The vessel was also swung a second time in 

 Falmouth Bay, complete magnetic observations being made over the same area where 

 similar work was done in 1909; the 1909 results were confirmed. In connection with the 

 Carnegie's work at Fahnouth, acknowledgment should be made of the aid received from 

 Doctors Glazebrook and Shaw, and Messrs. W. L. Fox, J. B. Phihpps, and Spry. 



October 15, the Carnegie left Falmouth on the last passage of the long cruise begun 

 in June 1910. On account of head winds she put in at New London, Connecticut, on 

 December 14, and was towed to Greenport on December 15. After reoccupying the repeat 

 stations at Greenport and Shelter Island, the Carnegie left on December 18 and was berthed 

 at Beard's Yacht Basin, Brooklyn, on December 19. The Director inspected the vessel 

 here, and conferred with W. J. Peters, commander, regarding the repair work required 

 after the three-year continuous cruise of the Carnegie. 



The scientific personnel on this cruise, besides the Director, who was with the vessel 

 from June to September 1911, consisted of the following persons: W. J. Peters, in com- 

 mand of vessel; C. C. Craft, surgeon and observer to April 1911 and from February 1913; 

 H. M. W. Edmonds, surgeon and magnetician, from March 1911 to February 1913; E. Kid- 

 son, observer, to June 1911; H. D. Frary, observer, to September 1912; C. W. Hewlett, 

 observer, from September 1912; H. F. Johnston, observer, from March 1911 to May 

 1913; H. R. Schmitt, observer, from May 1913; C. R. Carroll, meteorological observer 

 and clerk, to September 1911; N. Meisenhelter, meteorological observer and clerk, from 

 February 1912. (For view of the Carnegie's personnel, see PI. 15, Fig. 3.) 



