Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The bathythermograph, or BT, is a small torpedo-shaped device that holds a temperature sensor and a transducer to detect changes in water temperature versus depth. 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), temperature measurements can be correlated with the depth at which they are recorded.[citation needed] The bathythermograph was first developed by Athelstan Spilhaus.

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