CONTENTS. 



Land Magnetic Observations, 1911-13. page 



Introduction 3 



Descriptions of instruments 5 



Magnetometers 5 



Combined magnetometer and dip circle 7 



Combined magnetometer and earth inductor 9 



Dip instruments 12 



Earth inductors 13 



Reductions to standard instruments 15 



Magnetic standards adopted 16 



Magnetometer corrections 16 



Dip corrections 17 



Land magnetic observations, 1911-1913 21 



Explanatory remarks 21 



Observers 23 



Distribution of stations 24 



Results of land magnetic observations, 1911-1913 26 



Africa 26 



Algeria 26 



Algerian Sahara 27 



Anglo-Egjiptian Sudan 28 



British South and Central Africa 28 



Egjpt 29 



Eritrea 29 



French West Africa 30 



Gambia 31 



Liberia 31 



Morocco 32 



Nigeria 32 



Portuguese Guinea 32 



Rio de Oro 32 



Sierra Leone 32 



Tripolitania 32 



Tunisia 33 



Asia 33 



China 33 



India 34 



Indo-China 34 



Siam 35 



Turkish Empire 35 



Australasia 36 



Australia 36 



New Zealand 42 



Europe 43 



Bulgaria -IS 



Crete 43 



Great Britain 43 



Greece 44 



Italy 44 



Malta 45 



Serbia 45 



Spain 45 



Turkish Empire 45 



North America 46 



Canada 46 



Central America 47 



United States 47 



South America 48 



Argentina 48 



Bolivia 48 



Brazil 49 



Chile 51 



Colombia 52 



Ecuador 52 



Guiana 52 



Paraguay 52 



Peru 52 



Land Magnetic Observations, 1911-13 Continued. 

 Results of land masnetio observations, 1911-13 Cont. 



South America Concluded. page 



Uruguay 54 



Venezuela 55 



Islands, Atlantic Ocean 56 



Canary Islands 56 



Falkland Islands 56 



St. Helena 56 



West Indies 57 



Islands, Indian Ocean 58 



Ceylon 58 



Java 59 



Mauritius 69 



Islands, Pacific Ocean 60 



Fiji Islands 60 



Macquarie Island 60 



Philippine Islands 60 



Samoan Islands 61 



Society Islands 61 



Antarctic Regions 62 



Victoria Quadrant 62 



Observers' field reports 65 



J. P. Ault, on magnetic work in Peru, Bolivia, and 



Chile, March to August 1912 65 



D. W. Berky, on magnetic work in Morocco, 

 Gambia, Sierra Leone, and French Guinea, 

 March to August 1912 67 



D. W. Berky, on trans-Saharan magnetic expedi- 

 tion from Algiers, Algeria, to Timbuktu, French 

 West Africa, October 1912 to July 1913 68 



D. W. Berky, on magnetic work in French West 

 Africa, Military Territory of Niger, Dahomey, 



and Nigeria, July to December 1913 80 



F. Brown, on magnetic work in Northwestern 



Australia, September to October 1913 81 



F. Brown, on magnetic work in Northern Queens- 

 land, Australia, October to December 1913 83 



H. M. W. Edmonds, on a magnetic exploratory 

 trip in Patricia, Canada, and to Hudson Bay, 

 May to October 1913 84 



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

 China, and Siam, 1900 to 1913 95 



H. F. Johnston, on magnetic work in Brazil, Argen- 

 tina, Uruguay, and Paraguay, May 1913 to 

 February 1914 107 



E. ICidson, on the general magnetic survey of Aus- 

 tralia, 1911 to 1913 109 



E. Kidson, on the magnetic work during the trans- 

 continental trip in AustraUa, May to September 

 1912 Ill 



A. D. Power, on magnetic work in Peru, Ecuador, 

 Panama, Venezuela, Colombia, West Indies, 

 Brazil, and British Guiana, June 1912 to De- 

 cember 1913 114 



H. R. Schmitt, on magnetic work in Peru, May to 



August 1912 116 



H. R. Schmitt, on magnetic work in Peru and 



Bolivia, September 1912 to January 1913 117 



H. R. Schmitt, on magnetic work in Chile, January 



to March 1913 . 118 



W. H. Sligh, on magnetic work in Asia Minor, India, 



Egj'pt, and Sudan, January 1910 to June 1911 119 



W. H. Sligh, on magnetic work in the Balkan States, 



Turkey, and Italy, June to November 1911 122 



W. H. Sligh, on magnetic work in Northwestern 

 Africa, Tunis to Sierra Leone, November 1911 to 

 December 1912 122 



iii 



