Observers' Field Reports 107 



station at Lopburi is of special interest, as this place is identical with Louveau, where Guy 

 Tachart, S. J., observed the magnetic declination in 1682. The observations at Lopburi 

 were made at two stations, one in the eastern and the other in the southern section of the 

 ancient palace grounds. The results in Siam show a locally disturbed field, which is also 

 indicated by the few preliminary observations which the Roj'al Survey Department have 

 thus far secured. 



The total time devoted to this whole expedition was 5 months, not counting the 10 

 days spent in returning to Canton from the field. The total number of stations was 43, 

 giving thus an average of about 3 days per station. The total travel to and from the field 

 was 2,876 miles; while the total travel in the field was 4,059 miles, of which 257 were by 

 ocean steamer, 1,549 by river steamer, 150 by canoe, 75 by launch, and 150 on foot. In 

 China the total travel in the field was 565 miles, in French Indo-China, 2,440, and in Siam, 

 1,054. Much of the travel in French Indo-China was at the expense of the government, 

 while in Siam the entire transportation expenses were borne by the Siamese government. 

 The average travel in the field per station was about 80 miles in China, 90 in French Indo- 

 China, and 117 in Siam. The total expense of the whole expedition, not counting the 

 observer's salary, was $1,703, of which about $300 was for travel to and from the field and 

 about $250 for the work in China, $928 for that in French Indo-China, and $225 in Siam, 

 not taking into account the value of the transportation and other facilities provided by the 

 respective governments. The average per station for the whole expedition was a little 

 imder $40. Observations were made on 63 days and were prevented by bad weather on 

 10 days. 



Besides the assistance afTorded by the taotai of LLmchow, already referred to, 

 special acknowledgment is due to the residents superieurs of Tonkin, Annam, and Laos, 

 for the generous assistance which, under their direction, was afforded by the administrations 

 of their respective provinces, and to M. Chemin Dupontes, engineer-in-chief of the Yunnan 

 Railway, who provided free transportation and an escort on his line, and to Mr. Daniel 

 Brandela, agent of the Standard Oil Company at Tourane. In connection with the work in 

 Siam, special acknowledgment is due to the United States minister, Hon. Hamilton King, 

 and to Hon. Jens I. Westengard, General-Advisor to the Siamese government, on whose 

 advice His Highness, Phya Maha Ammat, vice-minister of the Interior, not only assmned 

 the expenses for transportation of the expedition within Siam but arranged for the enter- 

 tainment of the party at the various stations occupied and delegated one of his staff, Khoon 

 Arm Phan, as escort and interpreter. It was due to the facilities thus put at my disposal 

 that it was possible, within a fortnight, to observe at so many stations distributed through- 

 out the region accessible by rail. 



In connection with the work in China, acknowledgment is due to His British Majesty's 

 Consul-General O'Brien Butler and to Consul-General Wilden, of France, at Yunnanfu, 

 for their assistance and advice in overcoming the difficulties imposed on the expedition by 

 the state of revolution. 



H. F. Johnston, on Magnetic Work in Brazil, Argentina, Uruguay, and Paraguay, 



May 1913 to February 1914. 



On authority of instructions dated August 13 and October 24, 1912, and April 4, 1913, 

 I was relieved, on May 17, 1913, of duty aboard the Carnegie and placed in charge of 

 the land work here reported upon. The instrumental outfit consisted of magnetometer 

 No. 19, chronometers Nos. 1044 and 244, watches Nos. 103 and 107, observing-tent, 

 and accessories. 





