. Bathythermograph observations. Bathythermograph; Ocean temperature. HOW A BT WORKS The bathythermograph is designed to obtain a record of the temperature of sea water at moderate depths. It can be operated while the ship is underway at speeds up to 18 knots. The temperature element, corresponding to the mer- cury column in a glass thermometer, consists of a long length of fine copper tubing filled with xylene. The tubing is wound around inside the tail fins of the BT and is in direct contact with the sea water. BELLOWS. PEN SMOKED SLIDE PEN LIFTER BAR As the xylene expands or contra
. Bathythermograph observations. Bathythermograph; Ocean temperature. HOW A BT WORKS The bathythermograph is designed to obtain a record of the temperature of sea water at moderate depths. It can be operated while the ship is underway at speeds up to 18 knots. The temperature element, corresponding to the mer- cury column in a glass thermometer, consists of a long length of fine copper tubing filled with xylene. The tubing is wound around inside the tail fins of the BT and is in direct contact with the sea water. BELLOWS. PEN SMOKED SLIDE PEN LIFTER BAR As the xylene expands or contracts with the changing water temperature, the pressure inside the tubing increases or decreases. This pressure change is trans- mitted to a bourdon gauge, a hollow brass coil spring which carries a stylus at its free end. The stylus records the movements of the bourdon, as it expands or con- tracts with changes of temperature, on a smoked-glass slide. The slide is held rigidly on the end of a coil spring enclosed in a copper bellows or sylphon. Water pressure, which increases in proportion to water depth, compresses the sylphon as the BT sinks. This pulls the slide toward the nose of the BT at right. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Hydrographic Office. Washington, D. C. : Published by the U. S. Navy Hydrographic Office under the authority of the Secretary of the Navy
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Keywords: ., bookauthorunitedstateshydrographicoffice, bookc, bookcentury1900
