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en.wikipedia.org/wiki/Metal_detector

A metal detector is an electronic instrument which detects the presence of metal nearby. Metal .... Another development was the invention of detectors which could cancel out the effect of mineralization in the ground. This gave greater depth, but ...

www.metaldetector.com/learn/metal-detector-history/history-of-the-metal-detector

Other factors that have greatly influenced the development of metal detectors as we know them today include transistors - invented in 1947 by John Bardeen, ...

www.thoughtco.com/history-of-the-metal-detector-1992303

Sep 5, 2016 ... In 1881, Alexander Graham Bell invented the first metal detector. As President James Garfield lay dying of an assassin's bullet, Bell hurriedly ...

theinventors.org/library/inventors/blmetal_detector.htm

In 1881, Alexander Graham Bell invented the first metal detector. As President James Garfield lay dying of an assassin's bullet, Alexander Graham Bell hurriedly  ...

paleofuture.gizmodo.com/walk-through-metal-detectors-were-invented-to-catch-thi-520336775

Jun 20, 2013 ... But back in the 1920s the first walk-through metal detectors weren't invented for finding weapons (or nail clippers), they were invented for ...

www.kellycodetectors.com/catalog/library/history-of-metal-detectors

During his convalescence, Garfield was visited by Alexander Graham Bell who invented the metal detector specifically to help locate the bullet. Unfortunately for  ...

www.toptenreviews.com/electronics/articles/the-history-of-metal-detectors

The story of the metal detector begins with the California Gold Rush. ... so Alexander Graham Bell, the inventor of the telephone, designed a device that could ...

.ask.com/youtube?q=When+Was+Metal+Detector+Invented&v=CEWgZ273YJs
Nov 30, 2010 ... History of Invention of Metal Detector Metal detector is an electronic device which allows to detect metal objects in neutral or low-conductive ...

www.garrett.com/mediasite/history_en.aspx

Metal detectors designed and manufactured by Garrett: hand-held, ground- search and walk-through metal detectors for hobby, security and countermine ...

www.scitechantiques.com/belldiscovery

Metal Detector Props From The Discovery Channel ... The first metal detector Dr. Bell's used on President Garfield was made using a large primary coil with a ...