INTERNATIONAL ASPECTS OF OCEANOGRAPHY 



PLATE 28 



100* M 



Tracks of Oiief Vewels on Which Magnetic Observations Were Made in the Atlantic Ocean, 1839-1916 



G«M«. 1908 (Pacific) - 



Carnegie. !%<» 1915" 



-»- Cluclt. 1914 



Erebus and Terror, 1839-1843 Challenger, 1872 1876 Pagoda. 1845 — • — " • * — •" 



Novara. 1857-1860 Discovery, 19(12-1904 Gaielle. 187+-I876 • 77'^" 



Causs 1902-1O03 Coast and Geodetic Survey. 1903-1915 •• 



