HYDROGRAPHIC TABLES. 



27a 



This table is continued on p. 28A. 

 Example : Given : r =. 13-73 C.j D = 2700; average temperature above this level, 14. 2 C. 



The main table gives for t = 13.73 C ; D ='2700 0.00075 



The additional table gives for average temperature = 14.2 ; D = 2700 0.00002 



Found : i 7 D 0.00077 



