Bathythermograph
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A bathythermograph, or BT, also known as a mechanical bathythermograph, or MBT, is a device that holds a temperature sensor and a transducer to detect changes in water temperature versus depth down to
A bathythermograph
An XBT being launched via a handheld launcher
Anti-submarine warfare
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Anti-submarine warfare is a branch of underwater warfare that uses surface warships, aircraft, submarines, or other platforms, to find, track, and deter, damage, or destroy enemy submarines. Such oper
Bathythermograph
…the Totten Glacier in East Antarctica showed that water at depth above freezing temperature was melting the under-side of the glacier. Submarine and Anti-submarine warfare: to determine the layer depth (thermocline) used by submarines to avoid active sonar search. Depth sounding – Measuring the depths of a body of water…
Royal Navy officers on the bridge of a destroyer on convoy escort duties keep a sharp look out for enemy submarines during the Battle of the Atlantic, October 1941
An example of an anti-submarine net, once protecting Halifax Harbour, Canada.
11-inch Howitzer Mk. I on British armed merchant cruiser HMS Patia in 1918, it had a range of just about 600 yards (550 m)
A depth charge thrower being loaded aboard corvette HMS Dianthus, 14 August 1942