DEPARTMENT OF TERRESTRIAL MAGNETISM. 293 



AUSTRALIA. 



Since the 1919 report there have been received from Government 

 Astronomer G. F. Dodwell, of the Adelaide Observatory, cahiers of 

 magnetic observations made at 7 stations by the Geodetic and ]Mag- 

 netic Survey of South Austraha in cooperation with the Department. 

 The observations were made by Mr. Dodwell and Professor Kerr 

 Grant at various dates, 1916-1918, with instruments suppHed in part 

 by the Department. 



Absolute observations, as well as continuous photographic registra- 

 tions, have been obtained throughout the year at the Watheroo 

 Magnetic Observatory. (See p. 295). 



During the visit of the Carnegie at Fremantle, observations were 

 made there, and intercomparisons with the observatory instruments 

 at Watheroo were obtained. On October 20, 1920, the Carnegie 

 reached Lyttelton, New Zealand, and carried out a series of inter- 

 comparisons with the magnetic instruments of the Christchurch Ob- 

 servatory. 



SOUTH AMERICA. 



The only magnetic observations made in South America during the 

 year were those by the Carnegie observers at Florida, Buenos Aires, 

 January and February 1920, and occasional observations by Dr. 

 Edmonds during the construction of the Huancayo Magnetic Obser- 

 vatory, Peru. 



INSPECTION WORK IN SOUTH AMERICA. 



During January to March Mr. Fleming, as the Du'ector's representa- 

 tive, made an inspection trip to South America, \'isiting the Carnegie 

 at Buenos Aires and the projected Huancayo Magnetic Observatory 

 in Peru. En route to Buenos Aires he called at the National Observa- 

 tory of Brazil, meeting there, in the absence of Dr. Morize, Director 

 Ferraz, in charge of the forecast work, and Mr. Lemos, in charge of the 

 magnetic work. 



Mr. Fleming arrived at Buenos Aires on January 29. He found the 

 Carnegie in first-class condition and that the work was progressing in 

 a very satisfactory manner. The new coils for the marine moving-coil 

 galvanometer were mounted in the galvanometer tubes and balanced 

 with some difficulty. (These were replaced later by a specially 

 constructed tube, made upon Mr. Fleming's return to the office and 

 supplied the Carnegie at Colombo.) A new high-resistance coil was 

 mounted in marine earth-inductor No. 3 for experimental tests with 

 the string galvanometer; it was found, however, that the string galva- 

 nometer was not sufficiently sensitive, the resistance of the only sput- 

 tered fiber available being much too great. A method to produce 

 sputtered fibers of sufficiently low resistance therefore had to be 

 developed, and a new stock was supplied the Carnegie at Colombo, 

 from which point experimental work is being continued. 



