198 1. P. Kocu. 
For the radius at the range of vision in the Greenland Sea by 
using k = 0.584 from the formula: 
Ho . 
VAE 
one gets 
г = 5.54Vh!) 
where г is expressed in kilometres, h in metres. 
1) ALBRECHT gives for k == 0.2 | 
г — 3.99 Vin. 
