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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.
This is a list of historically significant items found by metal detecting method, only excluding magnet fishing finds, since magnet fishing is usually considered a distinctively different and separate hobby from traditional metal detecting.
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 ...
The album sold 143 copies in its first six months, [11] but received favorable reviews from the heavy metal press. Its unusual musical ideas—a synthesis of death, thrash, and industrial metal influences—prompted Andy Stout from Metal Hammer to call it "one of the most disturbing albums you'll hear for a very long time". [12]
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 ...
It was found in the Stringer district near Randsburg by prospector Ty Paulsen in 1977 using a metal detector. The nugget, which weighs 156 troy ounces (4.9 kg), is part of the Margie and Robert E. Petersen Collection of gold nuggets that was donated to the Natural History Museum of Los Angeles County. As of 2022, the bullion value of 4.9 kg of ...