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The Finnish company Outokumpu adapted mining metal detectors in the 1970s, still housed in a large cylindrical pipe, to make a commercial walk-through security detector. [36] The development of these systems continued in a spin-off company and systems branded as Metor Metal Detectors evolved in the form of the rectangular gantry now standard in ...
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.
Then green sand castings are used to make a metal lathe. The lathe is the first machine built since it can be used to help build itself. The lathe and foundry are then used to make more complicated machine tools. The books in the series are, in the suggested sequence of construction: The Charcoal Foundry; The Metal Lathe; The Metal Shaper
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 ...
A crystal detector includes a crystal, usually a thin wire or metal probe that contacts the crystal, and the stand or enclosure that holds those components in place. The most common crystal used is a small piece of galena; pyrite was also often used, as it was a more easily adjusted and stable mineral, and quite sufficient for urban signal ...
“The King” posted a picture on X showing him walking through a metal detector with his arms raised. The phot was captioned, “No one is exempt from the Secret Service Search!”
The video shows two Akron police officers monitoring the process of students going through metal detectors at Firestone Wednesday morning. The student, who has been identified as a 16-year-old, is ...
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.