INTERNATIONAL ASPECTS OF OCEANOGRAPHY 



PLATE 29 



■y '?• 'W IM* iW 170' laf 170' IM' 150' 140r 13o' 120" 110* m' SO' 80* Jo" 



ly^ 



120 150" HO 150 



lOT* ITif 180* ITO' no' ISO' mf 



Tracks of Chief Vessels on Which Magnetic Observations Were Made in the Pacific Ocean. 1839-1916 



Galilee. 1905-1908 



arnegie. I9II-I9I6 ■*" 



Guett. 1914 (Atlantic) 



Erebus and Tenor. 1839-1843 Novara, 1857-1860 ChaUenger. 1872-1876 ^.^r,^, 



Gazelle. 1874-1876 »—♦ — ♦ Discovery. 1902-1904 Coast and GeodeUc Survey. I90J-I9I5'^- 



