Show Ice Made In Open Air Dr Wells a London physician In 1818 in his puhllshed essay on dew was tho first to draw attention to the curious artificial production of ice In India Shallow pits are dug which art partially filled with perfectly dry straw on the straw board flat pans containing water are exposed to tho clear sky The water being a wonderful won-derful radiant sends off its heat abundantly abun-dantly into space The heat thus lost cannot be replaced re-placed from the earth for this source Is excluded by tho straW Before sunrise sun-rise a cake of Ice Is formed In each vessel To produce this Ice In quantities quan-tities clear nights are advantageous and particularly those on which practically prac-tically no dew falls Should the straw get wet It becomes be-comes more matted and compact and consequently a better conductor of heat for the vapor acts as a screen over the pans checks tho cold and retards freezing Pearsons Weekly |