CONTENTS. 



Land Magnetic Observations, 1914-20. page 



Introduction 3 



Descriptions of instruments 6 



Magnetometers 6 



Dip Circles and Earth Inductors 6 



Instruments for the Amundsen Arctic Expedition 8 



Reductions to Standard Instruments 9 



Magnetic standards adopted 9 



Magnetometer corrections 9 



Inclination corrections 11 



Land magnetic observations, 1914-1920 19 



Explanatory remarks 19 



Observers 21 



Distribution of stations 22 



Concerning geographic positions 23 



Revisions of field computations 26 



Astronomical work 26 



Magnetic work 28 



Results of land magnetic observations, 1914-1920 . 30 



Africa 30 



Abyssinia 30 



Anglo-Egyptian Sudan 30 



Angola 31 



Belgian Congo 32 



British South and Central Africa 34 



Cameroun 35 



Cyrenaica 36 



Egypt 36 



Eritrea 37 



French Equatorial Africa 37 



French Somaliland 40 



French West Africa 40 



Gold Coast Colony 40 



Liberia 40 



Nigeria 40 



Portuguese East Africa (Mozambique) 41 



Southwest Africa 42 



Spanish Guinea 42 



Tripolitania 42 



Uganda 42 



Asia 43 



Arabia 43 



China 43 



India 53 



Japan 53 



Siberia 53 



Straits Settlements 53 



Australasia 53 



Australia 53 



New Zealand 64 



Europe 66 



Great Britain 66 



Norway 68 



Russia 68 



North America 69 



Canada 69 



Central America 69 



Newfoundland (Including Labrador Coast) ... 70 



United States 70 



South America 78 



Argentina 78 



Bolivia 82 



Brazil 83 



Chile 85 



Colombia 86 



Ecuador 87 



Guiana 87 



Land Magnetic Observations, 1914-20 Continued. 

 Results of land magnetic observations, 1914-20 Cont'd. 

 South America Cont'd. page 



Peru 87 



Uruguay 90 



Venezuela 90 



Islands, Atlantic Ocean 90 



Canary Islands 90 



Fernando Po 90 



Iceland 90 



Madeiras 91 



St. Helena 91 



South Georgia 91 



West Indies 91 



Islands, Indian Ocean 92 



Ceylon 92 



Madagascar 92 



Islands, Pacific Ocean 93 



Bismarck Archipelago 93 



Easter Island 93 



Ellice Islands 93 



Fiji Islands 93 



Gilbert Islands 94 



Hawaiian Islands 94 



Lord Howe Island 95 



Marianas (Ladrone Islands) 95 



New Caledonia (Including Loyalty Islands) . . 95 

 New Guinea (Including Louisiado and D'En- 



trecasteaux Islands) 96 



New Hebrides 96 



Norfolk Island 96 



Samoan Islands 97 



Society Islands 97 



Solomon Islands 97 



Tokelau Islands 97 



Tonga Islands 97 



Observers' field reports 98 



D. W. Berky, on magnetic work along the Ara- 

 guaya and Tocantins rivers in Brazil, March 



to Sept. 1915 98 



F. Brown, on magnetic work in Northern Terri- 

 tory, Australia, March to Oct. 1914 100 



F. Brown, on magnetic work in the provinces of 

 Hunan, Kweichow, and Kwangsi, China, 



March to July 1915 105 



F. Brown, on magnetic work in Mongolia and 

 the northeastern provinces of China, Aug. 



1915 to July 1916 107 



F. Brown, on magnetic work in Manchuria, July 



to Oct. 1916 112 



F. Brown, on magnetic work in the southwestern 

 provinces of China and Upper Burma, Novem- 

 ber 1916 to June 1917 115 



F. Brown, on magnetic work in southeastern 



China, Aug. to Dec. 1917 122 



F. Brown, on magnetic work in Cameroun and 

 French Equatorial Africa, Mav 1919 to Jan. 



1920 130 



F. Brown, on trans-African magnetic expedition, 

 Angola to Mozambique, Jan. to Oct. 1920. . . 144 



G. F. Dodwell, on magnetic work in South Aus- 

 tralia, 1914 to 1918 152 



C. K. Edmunds, on magnetic work in China, 



Jan. 1915 to July 1917 154 



A. L. Kennedy, on magnetic work in South Aus- 

 tralia, April to July 1914 160 



