Operation Ivy Bells, page 35
T-bar – A piece of metal that has a T-shape in cross-section. Used as a strength member.
TOG – Test Operations Group; a code name for the team that operated from the Halibut and Seawolf.
Topside – The outside deck of a submarine. Can also refer to the watch station at the top of the sail when a sub is underway.
Towed array sonar – A shipboard sonar system where hydrophones are attached to a towed cable about 50 yards apart. The size of the array enables the determination of the distance to contacts.
Turk’s head – An ornamental knot resembling a turban in shape, made in the end of a rope to form a stopper.
Variable depth sonar – A shipboard sonar system on a telescoping shaft that can lower the sonar sensors to variable depths to get under shallow layers.
WRT – Water Round Torpedo Tank; a water tank used to flood a torpedo tube to allow a torpedo to swim out of the torpedo tube instead of being shot out with a burst of pressurized air.
XO – Executive Officer (See Executive Officer).
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Robert G. Williscroft, Operation Ivy Bells
