190 



Land Magnetic Observations, 1914-20 



the Sudan Government for the hire of a sailing boat, and business details occupied the 

 time to January 12, 1918. The journey of 1,100 miles to Rejaf, the head of navigation 

 on the White Nile, and return was accomplished in an open boat, with a crew of 4 Arabs 

 and one cook. This boat was equipped with a straw matting sunshade 6 feet long. On 

 the return down stream, 7 continuous days and nights were spent in coming through the 

 "bog" without landing. This was occasioned by one day's travel down the Bahr el 

 Zaraf to the place where it was closed by floating "sudd," and 2 days' travel back to the 

 Bahr el Gebel. Sixteen stations were occupied, 3 of which were stations of the Egyptian 

 Survey Department, and one a reoccupation of Dr. Beattie's station at Gondokoro. 

 Upon returning to Khartum on April 18, arrangements were immediately made to 

 accompany Signor Pastori in an Italian government automobile truck to Asmara, Eritrea. 

 Seventeen days were required for the journey, during which 4 stations were established. 

 We arrived at Asmara, where the C. I. W. station was reoccupied, on May 11, and that 

 at Massaua was reoccupied on May 19. Three days on a very small coasting steamer 

 brought me to Port Sudan, where another C. I. W. station was reoccupied. The railroad 

 journey by way of Atbara and Wadi Haifa on the Nile to Cairo, on which 9 stations were 

 occupied, began May 26 and ended July 10. Most of them were reoccupations of Egyp- 

 tian Survey stations. Intercomparison observations were carried out at the Helwan 

 Observatory in July. Thirty-two stations were occupied in 249 days, which averages 

 about 8 days for each station. The total number of miles traveled was 4,908, of which 

 2,241 were by steamer and railroad, and 467 by automobile. The average distance 

 traveled per station was 149 miles; the average field expense of the work along the 

 Nile, in Eritrea, and Red Sea Province was about $35 for a station. 



VI. Return to America via the Orient. Cable instructions to return to Washington 

 via the Pacific route were received in Cairo. Passport and various official permits having 

 been secured, and the Suez magnetic station having been reoccupied, the homeward 

 voyage began August 29. Stations were reoccupied at Tor, Jidda, and Aden without 

 any loss of time, but 2 days' change in the date of a ship from Aden to Jibuti caused me 

 to miss connection with the French mail for China. During the wait at Jibuti, a rail- 

 road trip to Addis Abeba was made and observations secured near the station of 1914. 

 On October 18, I departed from Jibuti, and after securing reoccupations of stations 

 at Colombo, Singapore, and Yokohama, I arrived in San Francisco December 26, 1918. 

 The homeward trip from Cairo covered 17,600 miles, and took 154 days. 



Table 30 gives names of the stations occupied, with dates and geographic positions; 

 for magnetic data, see Table of Results. 



Table 30. 



No. 



5 



6 



7 



8 



9 



10 



11 



12 



13 



Name 



New Zealand 



New Brighton Beach 



Cass 



Christchurch 



Australia 



Red Hill, A, B 



British South and Southwest Africa 



Durban 



Ginginhlovu 



Bethlehem 



Bloemfontein 



Cape Town, A 



Swakopmund 



Windhoek 



Gibcon 



Keetmaiixhtiop 



Date 



Dec. 

 u 



Jan. 

 Mar. 



Apr. 



1915 

 10 



12-13 

 19-24 



1916 

 12, Feb. 1 



22-23 

 25-26 

 30 



2 



9-10 

 20-22 

 25-26 

 2S 

 30 



Latitude 



43 31. 6S 



43 01. 5S 



43 31. 8S 



33 44. 5S 



29 

 29 

 28 

 29 

 33 



25 

 26 



52. 7S 

 01. 7S 

 13. 9S 

 07. 2S 

 56. IS 

 41. OS 

 33. SS 

 07. 2S 

 34. 7S 



Long. East 



172 45 



171 48 



172 37 



151 04 



31 04 



31 35 



28 17 



26 12 



18 29 



14 32 



17 05 



17 42 



18 04 



