59° _ ,_5g° Sr 56° 55° ^ 54° ^ 53 ° 52° 51 ° 50° 49 ° 48° 47° 46° 45° 44° 43' 



FIGURE 3.-ICE CONDITIONS AND SURFACE ISOTHERMS FOR THE PERIOD 16-30 

 APRIL, 1952. FIGURES INDICATE DAY OF MONTH ICE WAS SIGHTED OR REPORTED. 



260173 O - 54 (Face p. 12) No. 3 



