Word: bathythermograph
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...question of temperatures, they explained. Tropical sun had heated the water to a depth of 50 ft. The sound waves were bent by this temperature gradient, hiding a sub as effectively as if it were behind a hill. Equipped with a gadget of Woods Hole's devising, a bathythermograph, many a U.S. sub saved itself during World War II by finding a temperature "hill" in the ocean and slip ping behind...
...Gulf Stream, the boat has charted and recharted its shifting course in an efforts to get at the forces that underlie all currents. The traditional problem of charting the Gulf Stream from a moving boat at sea is slowly being solved by some new, and fanciful instruments. One, the bathythermograph, measures the temperature continuously as it is towed behind the ship. The sharp temperature variation between the Gulf Stream and the surrounding water supplies the club to the Stream, while LORAN (Long Range Radar Navigation) solves the difficult problem of giving the ship's exact location...
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