DEPARTMENT OF TERRESTRIAL MAGNETISM. 311 



Starting out from Apia as a base-station, Mr. Coleman proceeded, 

 under Dr. Edmonds's direction, to make magnetic observations on 

 various islands in the Pacific Ocean. Mr. Coleman was especially 

 charged with the reoccupation of certain stations at which Department 

 observers had made observations some years ago in order that he might 

 obtain the requisite data for determining the changes — known as 

 secular changes — which the Earth's magnetic state has undergone 

 since the dates of the earlier observations (see p. 326). 



At all ports of call of the Carnegie as planned. Captain Ault's party 

 has made valuable magnetic observations. 



The Department has cooperated with two polar expeditions — the 

 "Maud Expedition," under the leadership of Captain Roald Amundsen, 

 and the "Baffin Land Expedition," under the command of Dr. Donald 

 B. MacMillan. Important magnetic data have been obtained already 

 from both expeditions (see pp. 325-326 and 327). 



OBSERVATORY WORK. 



Some general statements concerning the present observatory work 

 have already been made in the "Introductory Remarks." The 

 work performed during the year may be summarized as follows : 



Watheroo Magnetic Observatory, Western Australia. — Captain E. 

 Kidson was observer-in-charge during the period November 1, 1920, 

 to January 31, 1921, when he resigned, to our great regret, in order 

 to accept the appointment of supervising meteorologist in the Cen- 

 tral Weather Bureau at Melbourne. He was succeeded by Mr. 

 W. C. Parkinson, who with the assistance of Assistant Observer J. 

 Shearer has successfully continued the activities of the observatory. 

 Dr. G. R. Wait left San Francisco in September for the Watheroo 

 Magnetic Observatory to install there the initial units of what is 

 ultimately to be a comprehensive equipment for atmospheric-electric 

 work. This equipment was constructed in the Department's instru- 

 ment shop. Dr. Wait will take full charge of the observatory work at 

 the end of 1921 to relieve Mr. Parkinson. Owing to circumstances 

 arising from the war it was necessary, unfortunately, for Mr. Parkinson 

 to remain continuously on duty at the isolated observatory site for a 

 period of about five years. High praise must be accorded him for his 

 unflagging devotion and zeal and for the conscientious and painstaking 

 manner in which he has performed his duties. (For an account of the 

 observatory's work during the year, see pp. 328-329). 



Huancayo Magnetic Observatory, Peru. — Dr. H. M. W. Edmonds 

 continued in charge of the construction of this observatory until 

 March 31, 1921, when he was relieved and assigned to the Pacific 

 Ocean work described below and on page 326. He was succeeded by 

 Mr. W. F. Wallis, who is an experienced magnetician and an architect. 

 It will be seen from pages 329-330 that Mr. Wallis has made excellent 



