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The bathythermograph, or BT, also known as the Mechanical Bathythermograph, or MBT; [1] is a device that holds a temperature sensor and a transducer to detect changes in water temperature versus depth down to a depth of approximately 285 meters (935 feet).
The earliest idea for a bathometer is due to Leon Battista Alberti (1404–1472) who sunk a hollow sphere attached to some ballast with a hook. When the ball reached the bottom it detached from the ballast and resurfaced.
She headed the Bathythermograph Unit beginning in February 1957, analyzing ocean temperature changes at various depths, over time and space, using computers to manage the large data sets involved. [ 9 ] [ 10 ] [ 11 ] Her work had applications in tracking submarines, tuna migration, and hurricanes, among other fields. [ 8 ]
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expendable bathythermograph (XBT) sampling lines to study changes in heat content of the upper ocean In-Situ Sea Level Measurements upgrading and installing new sea-level gauges to calibrate altimetry measurements Drifting Buoys and Floats
Repeat XBT (Expendable bathythermograph) line network (41 lines) Temperature JCOMM Ship Observations Team (SOT) Global tropical moored buoy network (~120 moorings) Temperature, salinity, current, other feasible autonomously observable ECVs JCOMM DBCP Tropical Moored Buoy Implementation Panel (TIP) Reference mooring network (29 moorings)
The use of bathymetry and the development of bathymetric charts dates back around the 19th century BC to ancient Egypt.Depictions on tomb walls such as the bas-relief carvings of Deir al-Bahri commissioned by Queen Hatshepsut in the 16th century BC show ancient mariners using long slender poles as sounding poles to determine the depth of the Nile River and into the Nile River Delta.
A thermo-hygrograph. A thermo-hygrograph or hygrothermograph is a chart recorder that measures and records both temperature and humidity (or dew point).Similar devices that record only one parameter are a thermograph for temperature and hygrograph for humidity.