[BARNES] THE PHYSICAL CONSTANTS OF ICE 25 



The more slowly artificial ice is frozen, and the less salt it contains, 

 the more transparent and rigid it is, and the more difficult to split with 

 a knife. 



In this respect the iinder-surface of a solid sheet of river-ice several 

 feet thick should be particularly firm and free from foam-walls ; for the 

 freezing goes on with great slowness, and all the dissolved salt should be 

 expelled and carried away by the undercurrents bathing the surface. 



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