202 REPORTS ON INVESTIGATIONS AND PROJECTS. 



Mr. C. D. Smith and Prof. W. C. Bauer, consulting engineers ; by Mr. James 

 Craig, jr., the builder of the engine, and by Mr. D. F. Smith, the engineer in 

 charge. 



The Carnegie first proceeded to Greenport, Long Island, and "swung ship" 

 in Gardiner's Bay on June 23 and 25 at the same place as last year. Having 

 completed the determinations of instrumental constants, course was set for 

 Vieques, Porto Rico, on June 29, via latitude 34° north and longitude 46° 

 west. She was visited and inspected at Greenport by President Woodward 

 in company with the Director. After an unusually favorable cruise, during 

 which observations of all the elements were possible on all but two days, 

 Vieques was reached on July 24. At this point opportunity was afforded, 

 through the courtesy of Superintendent O. H. Tittmann, of the United States 

 Coast and Geodetic Survey, to intercompare all of the instruments with the 

 standards of the Vieques Magnetic Observatory. After calling at San Juan, 

 Porto Rico, where valuable assistance was rendered the vessel by Commo- 

 dore Karl Rohrer, of the United States Naval Station, magnetic observations 

 were secured at the repeat station on Culebra Island ; the Carnegie left thence 

 for Para, Brazil, where she arrived September 24, 1910, having again in this 

 leg of the cruise encountered unusually favorable conditions for work. Upon 

 completion of the shore work at Pinheiro, the Carnegie left Para on October 

 15, 1910, and is en route to Rio de Janeiro at the end of the fiscal year. 



The present personnel of the Carnegie consists of the following: 



Scientific staff : L. A. Bauer, Director; W. J. Peters, in command of vessel; C. C. Craft, 

 surgeon and magnetic observer; E. Kidson, magnetic observer; H. D. Frary, mag- 

 netic observer ; C. R. Carroll, meteorological observer and clerk. 



Sailing staff and crew: F. S. McMurray, first watch officer; M. Clausen, second watch 

 officer; A. Jorgensen, third watch officer; M. G. R. Savary, engineer; eight seamen; 

 one mechanic ; two cooks ; two cabin boys. 



The personnel up to the completion of the first cruise in February was the 

 same as stated in the annual report of the Director for 1909. 



OEEICE WORK. 



Excellent progress has been made during the year with the work of com- 

 putation and this is practically complete for all work in hand to date. These 

 reductions involve very extensive discussions of the methods and constants 

 of instruments used. The first computations of the observations at some 350 

 stations since November 1908, in the African campaign of Dr. Beattie and 

 Professor Morrison, have been completed. The preparation of the data ob- 

 tained by the Department both at sea and on land for publication is well 

 advanced and very nearly completed for the operations to date. The question 

 of differences in various standards used by different governments and insti- 

 tutions has been studied at length and the reductions of the intercomparison 

 results so far obtained at 20 magnetic observatories in all parts of the world 

 have been completed. The constants and corrections to standard have been 

 determined or redetermined during the year for 10 magnetometers, 10 dip 



