Bathythermograph

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The bathythermograph, or BT, is a small torpedo-shaped device that holds a temperature sensor and an element to detect changes in water pressure. Lowered into the sea from an under way ship, the BT records pressure and temperature changes as it is dropped through the water. Because the pressure in decibars is approximately equal to the depth in meters, depth can be correlated with temperature.

It was first developed by Athelstan Spilhaus.

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