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Dan Jacobsen, the computer tech, deploys an
XBT (eXpendable BathyThermograph). This instrument consists of two
copper wires (1000m long) attached to a torpedo shaped weight. The
weight drops into the water from the gun Dan is holding with the
copper wires streaming behind. The weight contains a temperature
sensor and electronics that measure the temperature. The temperature
is then sent through the copper wires back to the ship and recorded.
These data are used to make a temperature versus depth profile and
serve to calibrate the sound velocity tables of the multibeam sonar.
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