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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 ...
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 pickup coil. When the coil nears metal, the control box ...
In the United Kingdom metal detecting is generally permitted provided certain criteria are met and efforts are made to record finds through the Portable Antiquities Scheme. The scheme has critics however, including some archaeologists and some metal detectorists themselves. Metal detecting in England is permitted and it is a legal hobby.
The Mine detector (Polish) Mark I (Polish: wykrywacz min) was a metal detector for landmines developed during World War II. Initial work on the design had started in Poland but after the invasion of Poland by the Germans in 1939, and then the Fall of France in mid-1940, it was not until the winter of 1941–1942 that work was completed by ...
The crystal detector was the most successful of many detector devices invented during this era. The crystal detector evolved from an earlier device, [40] the first primitive radio wave detector, called a coherer, developed in 1890 by Édouard Branly and used in the first radio receivers in 1894–96 by Marconi and Oliver Lodge.
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 ).
Like other solid state X-ray detectors, silicon drift detectors measure the energy of an incoming photon by the amount of ionization it produces in the detector material. This varying ionization produces varying charge, which the detector electronics measure for each incoming photon. [ 1 ]
The use of colorimetric test kits for explosive detection is one of the most simple methods for officers, and widely used method for the detection of explosives. . Colorimetric detection of explosives involves applying a chemical reagent to an unknown material or sample and observing a colo
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