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The bathythermograph, or BT, is a small torpedo-shaped device that holds a temperature sensor and a transducer to detect changes in hydrostatic pressure. Lowered into the water from an under way ship, the BT records pressure and temperature changes as it is dropped through the water. Because the pressure is a function of depth (see Pascal's law), it can be correlated with temperature. The bathythermograph was first developed by Athelstan Spilhaus.