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1000 BC to 900 BC United Kingdom: 2020 N/A Ringlemere Cup: Bronze Age United Kingdom: 2001 British Museum: Rogiet Hoard: 253 to 296 United Kingdom: 1998 National Museums and Galleries of Wales: Saddle Ridge Hoard: 1847 to 1894 United States: 2013 Undisclosed Saka Hoard: 11th or 12th century Estonia: 2015 N/A Seaton Down Hoard: 260 to 348 United ...
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 ...
Many such devices contain non-functional circuitry or naively constructed approximations of radio transmitters. A few do have functional circuitry, putting out a weak signal with a function generator or a simple timer circuit, but are still largely useless in comparison with a coil-based metal detector; others have been found to contain intentionally obfuscated or completely superfluous ...
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]
A growler is an electrical device primarily used for testing a motor for shorted coils. A growler consists of a coil of wire wrapped around an iron core and connected to a source of alternating current. When placed on the armature or stator core of a motor the growler acts as the primary of a transformer and the armature coils act as the ...
The sensor coil of a metal detector. These are coils used to translate time-varying magnetic fields to electric signals, and vice versa. A few types: Sensor or pickup coils - these are used to detect external time-varying magnetic fields; Inductive sensor - a coil which senses when a magnet or iron object passes near it
A Rogowski coil is a toroid of wire used to measure an alternating current I(t) through a cable encircled by the toroid. The picture shows a Rogowski coil encircling a current-carrying cable. The output of the coil, v(t), is connected to a lossy integrator circuit to obtain a voltage V out (t) that is proportional to I(t).
The basic RFT probe consists of an exciter coil (also known as a transmit or send coil) which sends a signal to the detector (or receive coil). The exciter coil is pumped with an AC current and emits a magnetic field. The field travels outwards from the exciter coil, through the pipe wall, and along the pipe.