Show It it well known that icebergs cool the water around them to a very considerable con-siderable distance. An American gentleman gen-tleman has made this fact the foundation founda-tion of an invention to protect vessels against collUion with icebergs. He proposes to place on the bottom of steamers or other vessels an apparatus so arranged as to sound an alarm on the instant a ship's keel enters a stratum stra-tum of cool water. On board steamers it is customary to take the temperature of the water every time the log is cast |