The worst enemy of a ship at sea is not storm or submarine but salt water. It corrodes a ship's hull, propellers and condensers, greatly shortens a ship's life. Salt water has been brutal to the overworked ships of World War II; corrosion of their condensers (in which cold sea water is pumped through tubes to condense spent steam from the engines) has been so accelerated that many have to lay up every nine months for retubing. But a device to draw the sting from salt water has been developed by a Seattle marine engineer named Arley Cheadle.
Last week, with the...
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