59° 58° 57° 56° 55° 54° 53° ■^° 52° 51° 50° 49° 48° a*%7° 46° 45° 44° 43° 



57° 56° 55° 54° &d" 52° 51° 50° 49° 48° 47° 46° 45° 44° 43° 



Figure 7. — First ice observation cruise, Mendota, 14 May to 24 May 1947, showing surface isotherms and track of vessel. 827714 o- 49 (Face p. 32)1 



