300 CARNEGIE INSTITUTION OF WASHINGTON. 



of Spitzbergen.^ The Carnegie arrived at Reykjavik on August 24 and, 

 after completing her shore and harbor work, she left on September 15 

 for Brooklyn, where she arrived on October 21. The total length 

 of this cruise was about 10,600 miles. The control observations 

 made at the intersection of the tracks of the present cruise with those 

 of the 1909 cruise have once more demonstrated the high accuracy 

 reached with the appliances and methods used aboard the Carnegie.^ 

 The Carnegie will next be fitted out for a cruise of about two years, 

 during 1915-1916, chiefly in extreme southern latitudes, 50° to 75°. 

 Plate No. 7 shows the tracks followed on the third, or 1914, cruise. 



In addition to the usual magnetic observations, special attention 

 has been paid also on this cruise to work in atmospheric electricity and 

 radioactivity. New methods and instrumental appliances have been 

 introduced, as based on the experience gained b}^ the observers during 

 the past cruises and the theoretical and experimental work of Dr. 

 W. F. G. Swann in the Department laboratory at Washington. Under 

 "Investigational Work in Washington" the results in atmospheric 

 electricity obtained on the previous cruises are briefly stated. 



For several years plans have been made for an expedition to Hudson 

 Bay to supplement the data obtained by the land expeditions sent out 

 by the Department. Owing to the heavy ice-conditions likely to be 

 encountered, it was not safe to undertake the expedition, as would 

 have been desirable, in the Carnegie, which was not built for work in 

 the Arctic regions. Accordingly a gasoline schooner, the George B. 

 Cluett, was chartered from the International Grenfell Association for 

 three months. The charter included the captain and other sailing 

 personnel, and all subsistence, including the subsistence of the observ- 

 ing party, consisting of Mr. W. J. Peters, in charge, and Observer 

 D. W. Berky. On account of the heavy ice along the Labrador coast 

 this year, it was not possible for the expedition to leave Battle Harbor, 

 Labrador, until July 31. Owing to the unusual ice-conditions, the 

 entry into Hudson Bay was delayed until September 2. However, 

 valuable observations were secured along the entire route, and the 

 expedition returned to Battle Harbor on October 3. 



'On August 21, the day of the solar eclipse, clear weather was encountered, the vessel being in 

 latitude 63° 24'..5 north and longitude 14° 32'.5 west. The times of contact were observed, some 

 photographs with small cameras were secured, and atmospheric-electric observations were made. 



^From the results of the present cruise it is seen that, on the average, the existing magnetic 

 charts show a west compass direction (west magnetic declination) too small, by about 1° to 3°, 

 according to the chart, thus again indicating that erroneous corrections on account of secular 

 changes in the compass direction have been used. 



