DEPARTMENT OF TERRESTRIAL MAGNETISM. 317 



NORTH AMERICA. 



Chief Observer Peters, assisted by Observer Berky, carried out an 

 expedition to Hudson Bay, on board the gasohne schooner George B, 

 Cluett, chartered from the International Grenfell Association, of St. 

 John's, Newfoundland. The magnetic observations were made both 

 on land and on board. The vessel is not a non-magnetic one like 

 the Carnegie. The instrumental equipment included, besides the land 

 instruments, a liquid compass and deflector for declinations and inten- 

 sities, and a marine dip circle. Messrs. Peters and Berky arrived at 

 Battle Harbor, Labrador, on June 28. Although the Clueit was avail- 

 able for their work on July 8, it was not possible, on account of unusually 

 bad ice conditions, to leave Battle Harbor before July 31. For the 

 determination of ship deviations the vessel was "swung" prior to 

 departure. The Cluett arrived at Hopedale, Labrador, on August 8, 

 by the inland passage. Unusual ice conditions delayed entering Hud- 

 son Bay until September 2; the vessel was obhged to leave Hudson 

 Strait again on September 28, and returned safely to Battle Harbor, 

 Labrador, on October 3. In addition to observations at various land 

 stations en route from Battle Harbor to Hudson Bay, valuable results 

 were obtained aboard, the vessel being swung each time, in order to 

 eliminate the disturbing element of the vessel. The Department is 

 under obligations to the United States Coast and Geodetic Survey for 

 the loan to this expedition of Dover dip circle No. 4655. 



SOUTH AMERICA. 



Observer H. F. Johnston was at work in South America at the 

 beginning of the fiscal year and continued in the field during November 

 to January. He returned to Washington on February 3. His obser- 

 vations were made in Uruguay, Paraguay, and Brazil, the last station 

 being Corumba, Brazil. 



Observer A. D. Power was en route at the beginning of the fiscal 

 year from Brazil to British Guiana, on the headwaters of the Rio 

 Branco. He arrived at Georgetown, British Guiana, early in Decem- 

 ber, having observed at nine stations, and returned to Washington 

 on December 18. At several of Mr. Power's stations observations had 

 been made previously by the Department; thus valuable secular- 

 variation data were secured. 



Mr. Power left Washington again on March 9 for Caracas, Venezuela, 

 where he arrived March 20. After reoccupying our station there, he 

 proceeded overland to San Fernando, on the Apure River. Thence the 

 trip was continued up the Meta River, observations being made en 

 route, and Mr. Power arriving at Bogota, Colombia, June 2. During 

 this trip 20 stations were established in Venezuela and Colombia. 

 From Bogota he proceeded south to Neiva, Colombia, where he arrived 

 July 8. After reoccupying our station at this point, he resumed the 



