216 Land Magnetic Observations, 1914-20 



the Indian Ocean in October 1920, and immediately crossed over to Madagascar to 

 undertake a magnetic survey of that island. He arrived at Majunga and established a 

 station there about the middle of the month, then proceeded by steamer, by cart, and 

 by carriers to Tananarive, establishing stations en route. As it was well known that large 

 local disturbances exist at Tananarive and presumably at other points, special precau- 

 tions were taken to secure representative values at each station, and accordingly when- 

 ever possible complete observations were made at a supplementary station in order to 

 reduce the effect of assigning a highly disturbed value to the locality. At Tananarive 

 a series of comparison observations was carried out with the instruments of the Tanan- 

 arive Observatory during the month of November. Through the cordial cooperation 

 of the colonial authorities, who rendered substantial assistance in providing transporta- 

 tion and hospitality, Mr. Brown arranged and by the end of the year had begun to carry 

 out an extensive program of work which was to cover the whole island in a general way. 

 The stations occupied before the end of December 1920 are given in Table 38. 



C. K. Edmunds. During the summer of 1914 Dr. Edmunds erected 2 small huts 

 on the campus of Canton Christian College which were used as base-stations for the 

 survey of China carried out during the next few years. Observations of diurnal variation 

 in declination were made here at intervals during 1915 and while the survey was in 

 progress, and special observations were made during the eclipse of August 21-22, 1914. 

 Two short trips were made in 1914, one to Shekki and Macau south of Canton in July, and 

 one in August to Sheklung and Loh Fau Shan, where observations were made near the top 

 of the mountain at an altitude of about 4,000 feet. The latter journey was made by 

 rail to Sheklung, about halfway between Canton and Hongkong, and thence by boat 

 and by chair or on foot about 20 miles to the mountain, which is one of the highest peaks 

 in the southern part of the province. 



H. W. Fisk. In September 1917 Mr. Fisk was directed to proceed to Langley Field, 

 Virginia, for the purpose of determining the magnetic elements at a station on the 

 aviation grounds for use in carrying out experiments in progress at that time. After 

 supplying the desired information, the United States Coast and Geodetic Survey station 

 at Hampton, Virginia, was occupied. 



In order to properly control the observations made during swings of the Carnegie 

 at the close of Cruise V and after extensive repairs and alterations in Baltimore before 

 the beginning of Cruise VI, land stations were established along the shores of Chesapeake 

 Bay in the neighborhood of the position of swing. Mr. Fisk, assisted by Messrs. H. R. 

 Grummann and R. R. Mills, carried out the observations, using for the purpose mag- 

 netometer-inductor No. 25 and magnetometer No. 5, the absolute instruments used at 

 land stations of the Carnegie, and dip circle No. 202, thus providing 2 complete outfits. 

 The party, with headquarters at Solomons Island, made observations at 13 stations, 

 during June 27 to July 8, 1919. These stations are distributed over a distance of about 

 24 miles along the west shore and throughout 17 miles approximately of the eastern shore 

 and outlying islands. The stations are in 2 lines between 10 and 14 miles apart, and their 

 mean position is not far from the position of swing at north latitude 38 12' and west 

 longitude 76 16'. 



E. Kidson. After the conclusion of the Australian Survey, Mr. Kidson returned 

 to Washington and in the summer of 1915 went to England to offer his services to his 

 country. Prior to entry upon military duties, he secured comparisons between the 

 instruments of the Department and those of such English observatories as were in position 

 to cooperate. The instrument taken for the purpose was magnetometer-inductor No. 

 26, which had been thoroughly compared with the instruments used as standard at 



