53° 52° 51° 50° 49° 48° 47* 



59° 58' 57° 56° 55° 54° 53° 52° 51° 50' 



48° 47° 46° 45° 



Figure 18.— Tenth cruise, July 26 to August 10, 1939, showing surface isotherms, track of vessel, and ice conditions. (Numerals indicate day of month ice was sighted or reported.) 



:;2089!)— 10 (Face p. 34) No. 10 



