Rq° 58° 57° 56° 55° 54° 53' 52° 51° 50° 49° 48° 47° 46° 45° 44° 43' 



55° 54° 53° 52° 51° 50° 49° 48° 47° 



Figure 18.— Surface water temperatures for June 8-21, 1933. Isotherms are drawn for each 6° F. 



46° 45° 44° 43° 



0338 — 34. (Face p. 34.) No. 7 



