98 Land Magnetic Observations, 1911-13 



compared the Chasselon magnetometer and dip circle with the absolute instruments of the 

 Zikawei Observatory, namely, Kew magnetometer Elliott No. 47 and Kew dip circle 

 Cassella No. 14. After a side trip by rail to Soochow and return and further conference 

 with the acting coast inspector, Captain T. J. Eldridge, we started on August 13 on a 2- 

 weeks' cruise throughout the Chusan Archipelago on board the customs cruiser Liu Shing, 

 which was making a round of the lighthouses in that region. The courtesy of traveling on 

 the cruiser was extended by the coast inspector under instructions from Sir Robert Hart, 

 inspector-general of the Chinese Imperial Maritime Customs, in response to my request, 

 which was courteously forwarded to him by the Honorable W. W. Rockhill, then American 

 Minister at Peking. 



Captain Powell, of the Liu Shing, and his officers, rendered every possible assistance, 

 and under instioictions from Captain Eldridge, made special stops in addition to the regular 

 visits to the lighthouses. In consequence of the facilities thus afforded for observing in 

 the daytime and for rapid travel at night, 8 stations, 2 of which were visited twice, were 

 occupied within the fortnight at places which would have been otherwise inaccessible. 

 The Liu Shing brought me back to Shanghai on August 27, and on August 30 I left by 

 coasting-steamer for Ningpo, returning again to Shanghai on September 3 after an unsuc- 

 cessful attempt to reach the island of Chusan by launch from Ningpo, being thwarted in 

 this attempt by sickness due to the intense heat and also by a prolonged storm. From 

 Shanghai another side trip was made by means of a steam-launch and houseboat to Hang- 

 chow, from which place also, under the auspices of Mr. C. Pape, first assistant in the 

 customs at Hangchow, a side trip was made to the mountain resort of Mokanshan. 

 Returning to Shanghai on September 12, the next 2 days were devoted to further com- 

 parisons at the Zikawei Observatory. On September 15 we left Shanghai for Hongkong 

 on the Japanese mail steamer Sado Maru, which, on the early morning of the 18th, encoun- 

 tered a very heavy typhoon and was consequently greatly delayed. I reached Canton on 

 September 20. 



On 2 days in October and 3 in November opportunity was taken to make further 

 observations at Honglok, and in December 4 days were devoted to additional comparison 

 of instruments at the Hongkong Observatory, a round trip being made from Canton for 

 that purpose. During October, November, and December, about 16 days were also devoted 

 to computation of results at such intervals as could be secured from my college duties. 



The following stations were occupied : 



1. Hongkong (reoccupied at close of expedition). 



2. Canton (Honglok), Kwangtung (reoccupied at close of 



expedition). 



3. Swatow, Kwangtung. 



4. Chaochowfu, Kwangtung. 



5. Amoy, Fukien. 



6. Chuanchow, Fukien. 



7. An Tau, Fukien. 



8. Foochow, Fukien. 



9. Yangchow, Kiangsu. 



10. Chinkiang, Kiangsu. 



11. Chinkiang B, Kiangsu. 



12. Zikawei, Kiangsu (reoccupied after 24). 

 l.S. Soochow, Kiangsu. 



The total time devoted to the field work of this expedition, including the observations 

 at Honglok and the comparisons at Hongkong both at the beginning and the end of the trip, 

 but not counting the time spent at Canton in the reduction of the comparison observations 

 and making the final computations at the close of the expedition, was 100 days, or an average 

 of about 4 days per station. Observations were made on 50 days and bad weather pre- 

 vented observations on only 9 days in the entire period. The total time actually spent in 

 travel was 33 days and the total distance traversed was 4,501 miles, comprising 3,355 by 

 ocean and river steamers, 555 on the customs cruiser Liu Shing, 206 by launch, 146 by 



14. Gutzlaff, Chusan Archipelago, Chekiang (reoccupied be- 



tween 18 and 19). 



15. Bonham, Chusan Archipelago, Chekiang. 



16. Putu, Chusan Archipelago, Chekiang (reoccupied be- 



tween 18 and 19). 



17. Peiyushan, Heishan Islands, Chekiang. 



18. Kunsuwan, Kue Shan, Chusan Archipelago, Chekiang. 



19. North Saddle, Chusan Archipelago, Chekiang. 



20. Shaweishan, Chusan Archipelago, Kiangsu. 



21. Liuchiao, Tsungming Island, Kiangsu. 



22. Ningpo, Chekiang. 



23. Hangchow, Chekiang. 



24. Mokanshan, Chekiang. 



