58° 57° 56° 55° 54° 53° 52° 51° 50° ^'^g'^ ^° ^^ , ^\ ^^° '^° ^3" 



58° 57° 56° 55° 54° 53° 52» 51° ' 50° 49° 48° 47° 46° 



Fir.iiRE 11.— Third ice observation cruise, Mendota. 25 June to 9 July 1947, showing surface isotherm.s. 



45° 44° 43° 



827714 O - 49 (Face p. 32) No. 5 



