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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 ...

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

The story of the metal detector begins with the California Gold Rush. ... A Polish lieutenant created a more advanced version of the metal detector during World ...

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  ...

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 ... Today we walk through metal detectors to get into courthouses, airports, and even concert venues. But back in the 1920s the first walk-through ...

patch.com/minnesota/roseville/how-metal-detectors-invented-and-what-they-are-used-for

Jul 20, 2014 ... As a common application of metal detectors in modern society, walk through metal detector was invented to find out would-be thieves in the ...

www.ask.com/youtube?q=Who+Invented+The+Metal+Detector&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 ...