Bathythermograph: Difference between revisions
From Glossary of Meteorology
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|Meaning=(Abbreviated BT.) A device for obtaining, from a ship under way, a record of [[temperature]] against depth (strictly speaking, [[pressure]]) in the upper 300 m of the ocean. | |||
|Explanation=For a [[thermal]] element it has a xylene-filled copper coil, which actuates a stylus through a [[Bourdon tube]]. The pressure element is a copper [[aneroid capsule]] that moves a smoked glass slide at right angles to the motion of the stylus. A double [[analog]] record is thus obtained as the BT is lowered and recovered. This device has generally been replaced by the [[expendable bathythermograph]] (XBT). | |||
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Latest revision as of 12:21, 26 March 2024
(Abbreviated BT.) A device for obtaining, from a ship under way, a record of temperature against depth (strictly speaking, pressure) in the upper 300 m of the ocean.
For a thermal element it has a xylene-filled copper coil, which actuates a stylus through a Bourdon tube. The pressure element is a copper aneroid capsule that moves a smoked glass slide at right angles to the motion of the stylus. A double analog record is thus obtained as the BT is lowered and recovered. This device has generally been replaced by the expendable bathythermograph (XBT).
