NO. 10 WATER TRANSPARENCY — WILLIAMS, JOHNSON, DYER I J 



46 



44' 



• + ** 



& 



*v 



* 





43" 



42° 



10 ° l7i mi 1 1 ti i rr -ii r 1 1 t 1 1 1 1 1 1 1 1 1 n 1 1 1 1 1 1 1 1 1 1 n 1 1 1 rri rri n n 1 1 1 r 1 1 f 1 1 i n 1 1 1 1 1 1 N 40 o 



69° 68° 67° 66° 65° 64° 



Fig. 4. 



