History | |
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Name | USS Deperm |
Builder | Albina Engine and Machine Works, Portland |
Laid down | 1943 |
Launched | 1944 |
Commissioned | 1945 |
Reclassified | YDG-10 |
Stricken | 21 February 1975 |
Fate | Sunk as a target, 22 September 1982 |
General characteristics | |
Type | Patrol Craft, Escort |
Displacement | 850 long tons (864 t) |
Length | 184 ft 6 in (56.24 m) |
Beam | 33 ft 1 in (10.08 m) |
Draft | 9 ft 5 in (2.87 m) |
Propulsion |
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Speed | 15.7 knots (29.1 km/h; 18.1 mph) |
Complement | 99 |
Armament |
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USS Deperm (ADG-10) was a degaussing vessel of the United States Navy, named after the term deperm , a procedure for erasing the permanent magnetism from ships and submarines to camouflage them against magnetic detection vessels and enemy marine mines. Originally planned as a patrol craft escort (PCE-883), she was laid down in 1943, launched in 1944, and commissioned in 1945. She was subsequently redesignated a degaussing vessel, YDG-10, and named Deperm.
Struck from the Naval Register 21 February 1975, Deperm was sunk as a target 22 September 1982 at 32°58′0″N119°41′0″W / 32.96667°N 119.68333°W . According to the available depth data in 2020, at this location the bottom is between 1250m and 1500m along the edge of a basin. [1]
Degaussing is the process of decreasing or eliminating a remnant magnetic field. It is named after the gauss, a unit of magnetism, which in turn was named after Carl Friedrich Gauss. Due to magnetic hysteresis, it is generally not possible to reduce a magnetic field completely to zero, so degaussing typically induces a very small "known" field referred to as bias. Degaussing was originally applied to reduce ships' magnetic signatures during World War II. Degaussing is also used to reduce magnetic fields in cathode ray tube monitors and to destroy data held on magnetic storage.
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