ARCTIC TIDES 



21 



Fig. 2 — Fjeldstad's cotidal map of the Arctic seas, 1923, incorporating the preliminary tidal obser- 

 vations of the Maud expedition, 1918-1921, and conforming to Hansen's hypothesis of a deep polar 

 basin. Scale, i : 82,000,000. (Reduced from work cited in footnote 11.) 



ets" Sti"*g 



Fig. 3 — H. U. Sverdrup's cotidal map of the North Siberian shelf sea, 1926, incorporating the final 

 tidal observations of the Maud expedition. Scale, r : 30,000,000. (From work cited in footnote 12.) 

 The map is inverted to allow more readily of comparison with Fig. 2. 



