=f49° 



59° 58° 57° 56° 55° 54° 53° 52° 51° 50° 49° 48° 47° 46° 45°" "' 44° 



FIGURE 4.--ICE CONDITIONS AND SURFACE ISOTHERMS FOR THE PERIOD 1-15 MAY. 

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



260173 O - 54 (Face p. 12) No. 4 



