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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 ...
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 ...
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. The visor was originally ...
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]
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.
A different sort of "induction loop" is applied to metal detectors, where a large coil, which forms part of a resonant circuit, is effectively "detuned" by the coil's proximity to a conductive object. The detected object may be metallic (metal and cable detection) or conductive/capacitive (stud/cavity detection). Other configurations of this ...
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