H. CONCLUSION 



From the foregoing discussion it is evident that for the degree of 

 accuracy necessary Tinder ordinary conditions, the use of equation (23) with 

 a value of taken from Table I is adequate for forecasting ice thickness 

 when there is a snow cover on the ice surface and when the ice has con- 

 siderable initial thickness. With no snow cover and neglecting the initial 

 ice thickness, the graphical method of Figure 13 furnishes an adequate 

 solution. Only for a greater degree of accuracy is it necessary to make 

 an individual computation of © taking account the particular coefficients 

 of radiation, convection, evaporation, condensation, humidity, and reflection. 



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