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  2. List of metal detecting finds - Wikipedia

    en.wikipedia.org/wiki/List_of_metal_detecting_finds

    Crosby Garrett Helmet: 2nd or 3rd century United Kingdom: 2010 Undisclosed Cunetio Hoard: Late antiquity United Kingdom: 1978 British Museum/Wiltshire Museum: Dairsie Hoard: 3rd century United Kingdom: 2014 National Museum of Scotland: Derrynaflan Chalice: 8th or 9th century Ireland: 1980 National Museum of Ireland: Escrick ring: 5th to 6th ...

  3. Metal detector - Wikipedia

    en.wikipedia.org/wiki/Metal_detector

    U.S. Army soldiers use a military standard metal detector. A metal detector is an instrument that detects the nearby presence of metal. Metal detectors are useful for finding metal objects on the surface, underground, and under water. A metal detector consists of a control box, an adjustable shaft [dubious – discuss], and a variable-shaped ...

  4. Crosby Garrett Helmet - Wikipedia

    en.wikipedia.org/wiki/Crosby_Garrett_Helmet

    The Crosby Garrett helmet is an almost complete example of a two-piece Roman cavalry helmet. The visor portrays the face of a youthful, clean-shaven male with curly hair. The headpiece is in the shape of a Phrygian cap , on the crest of which is a winged griffin that stands with one raised foot resting on an amphora .

  5. Gerhard Fischer (inventor) - Wikipedia

    en.wikipedia.org/wiki/Gerhard_Fischer_(inventor)

    Although the actual inventor of the hand-held metal detector is disputed, the hand-held metal detector was made in 1925 and was first patented by Dr. Gerhard Fisher in 1931. A metal detector had been invented some forty years earlier (1881) by Alexander Graham Bell for the sole purpose of locating a lead bullet in President James A. Garfield.

  6. Garrett AiResearch - Wikipedia

    en.wikipedia.org/wiki/Garrett_AiResearch

    The company's first major product was an oil cooler for military aircraft. Garrett designed and produced oil coolers for the Douglas DB-7. [9] Boeing's B-17 bombers, credited with substantially tipping the air war in America's and Great Britain's favor over Europe and the Pacific, were outfitted with Garrett intercoolers, as was the B-25. [12]

  7. Underwater search and recovery - Wikipedia

    en.wikipedia.org/wiki/Underwater_search_and_recovery

    Magnetometers can be used as metal detectors: they can detect only magnetic metals, but can detect such metals at a much greater distance than conventional metal detectors which rely on conductivity; they are capable of detecting large ferrous objects over considerable distances. Side-scan sonar and multi-beam sonar.

  8. Garrett Motion - Wikipedia

    en.wikipedia.org/wiki/Garrett_Motion

    Garrett Motion Inc., formerly Honeywell Transportation Systems and Honeywell Turbo Technologies, is an American company primarily involved in engineering, development and manufacturing of turbochargers and related forced induction systems for ground vehicles from small passenger cars to large trucks and industrial equipment and construction ...

  9. Magnetic anomaly detector - Wikipedia

    en.wikipedia.org/wiki/Magnetic_anomaly_detector

    A magnetic anomaly detector (MAD) is an instrument used to detect minute variations in the Earth's magnetic field. [1] The term typically refers to magnetometers used by military forces to detect submarines (a mass of ferromagnetic material creates a detectable disturbance in the magnetic field ).