DEPARTMENT OF TERRESTRIAL MAGNETISM. 323 



Grummann, and R. R. Mills (until October 12), observers; F. A. Franks, 

 surgeon (from October 12); A. Erickson, first watch-officer; C. E. 

 Leyer, engineer; L. Larsen, second watch-officer; N. C. Jorgensen, 

 third watch-officer; 2 cooks; 1 mechanic; 8 seamen; 2 cabin-boys; in 

 all, 23 men. In addition, the Director was aboard from Balboa to 

 Washington, October 12 to November 10. 



The continued success of the ocean-survey work has been made 

 possible in no small measure by the privileges and many courtesies 

 extended the Carnegie and her staff by governmental and harbor 

 authorities, as well as by men of science, at every port of call. 



Concerning the preliminary results of ocean magnetic observations 

 on the Carnegie for Cruise VI from Lyttelton, New Zealand, to 

 Washington, November 1920 to November 1921, see abstracts and 

 tables on pages 342-345. 



LAND-SURVEY WORK. 



The demands upon personnel and funds, as referred to on page 310, 

 have restricted the amount of land-survey work. An excellent series 

 of observations at new and secular-variation stations has been obtained 

 in Africa, and a fairly detailed magnetic-survey of Madagascar has 

 been completed. Valuable magnetic data have also resulted from 

 the land observations at ports of call of the Carnegie and on some of the 

 islands of the Pacific Ocean by a special land party. In addition, some 

 magnetic results have been obtained by cooperation with two polar 

 expeditions. 



AFRICA. 



Mr. Frederick Brown, who began work in Africa in April 1919, had 

 completed his work in Cameroun by the end of that year and was 

 engaged throughout the greater part of 1920 in making a trans- 

 continental trip across Angola, Rhodesia, and Mozambique. On 

 August 4, 1920, he arrived at Feira on the eastern boundary of 

 Northern Rhodesia and crossed over into Portuguese East Africa. 

 Chinde was reached September 21, 1920. Mr. Brown proceeded 

 thence down the coast about 150 miles to Beira, where plans were made 

 for the work in Madagascar. 



From March 14, 1920, the date of arrival at Lobito on the west coast 

 of Angola, to October 1, the date of departure from Beira on the east 

 coast of Portuguese East Africa, 54 stations had been occupied at an 

 average rate of less than 4 days for each station, while a distance of 

 nearly 3,200 miles had been traversed, making the average distance 

 between the stations approximately 60 miles. About 1,800 miles had 

 been covered on foot with carriers and about 400 miles by canoe. The 

 average field-expense for each station was a little less than $20. 

 Eleven of the 54 stations had been occupied previously by other 

 observers of the Department; 4 of these were near the west coast, 5 

 were in central Africa, and 2 were near the east coast. 



