ILL! 



18 



16 



14 



12 



<2 10 



< 



Q 

















£ ' + 50£ 



= 8lT j 





4 



N / I ■ 



V 1 



if/ 







/ : 

 / 8 











Ar 



Ayr 

























ey 9>_^^ 











<-5 



y^ 



























10 12 



ICE THICKNESS (cm.) 



FIG. 18. EMPIRICAL FORMULAE OF ZUBOV S 

 TYPE COMPARED WITH OBSERVED ICE GROWTH 

 AT ARCHANGEL, U.S.S.R. 



