DEPARTMENT OE TERRESTRIAL MAGNETISM. 233 



Mr. Berky joined Mr. Sligh in Morocco at the end of March for instruc- 

 tion and assignment to field work. He made magnetic observations at 6 

 stations in Morocco and during July and August observed in Sierra Leone 

 and French Guinea at 8 stations. He arrived at Algiers early in September 

 and left Biskra on October 29, in charge of an expedition across the Sahara 

 desert. Observer H. E. Sawyer accompanied and assisted Mr. Berky on 

 this expedition, joining the party at Algiers in September. Special magnetic 

 observations were made at the Algiers Observatory by Messrs. Sligh, Berky, 

 and Sawyer on October 10, 1912. 



Asia. — Observer C. K. Edmunds, during November 1911 to February 

 1912, made magnetic observations in China, Indo-China, and Siam. Four 

 stations were occupied in Yunnan Province, China. The original plan for 

 the extension of the magnetic survey further inland had to be abandoned 

 at Yunnanfu on account of the revolution, then at its height. The program 

 was accordingly changed and work was undertaken in Indo-China and in 

 Siam, 26 stations being secured in Indo-China and 9 in Siam. The observa- 

 tions at Lop Buri, Siam, are of particular interest, as this place is identical 

 with Louveau, where Guy Tachart, S. J., observed the magnetic declination 

 in 1682. Dr. Edmunds was accompanied, as in 1911, by Assistant Observer 

 Ngaan Yen Kwong. 



Australasia. — The magnetic work in Australasia during the present year 

 has been continued under charge of Observer E. Kidson. In November 

 and December 191 1 he made observations at Mildura, Woomelang, and Mel- 

 bourne in Victoria, at Hobart in Tasmania, and at Albury in New South 

 Wales. At Hobart the magnetic instruments (in part supplied by the De- 

 partment of Terrestrial Magnetism) of the Australasian Antarctic Expedi- 

 tion were compared and standardized by simultaneous observations with 

 Mr. Kidson's outfit. Messrs. E. N. Webb and A. L. Kennedy, magnetic 

 observers for the expedition, were further instructed in the use of instru- 

 ments and methods. While at Melbourne dip intercomparisons were made 

 with the observatory dip circle. In January secular variation data were 

 secured by observations at two stations at Nelson, New Zealand. During 

 February to April complete observation^ were secured at 25 stations in 

 Western Australia. While at Mount Magnet observations at 5 auxiliary 

 stations were made to investigate in a general way the local disturbance in 

 this locality; the disturbance decreased as the mount was descended and 

 very rapidly so on leaving the actual formation of the mount itself and 

 proceeding along the plain at its foot. Arriving at Adelaide, South Austra- 

 lia, about the middle of May, Mr. Kidson set out on a transcontinental trip 

 to Port Darwin. On May 24 his party arrived at Oodnadatta, the northern 

 terminus of the railroad ; from this point travel northward to Pine Creek, 

 the southern terminus of the railroad from Port Darwin, was by caravan 

 about 1,100 miles. On July 25 the party arrived at Barrow Creek, about 

 half the journey having been accomplished. The party experienced many 



