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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 ...

en.wikipedia.org/wiki/Gerhard_Fischer_(inventor)

Gerhard Fisher contributed to the development and popularity of the hand held metal detector. Contents. [hide]. 1 Biography. 1.1 Inventions; 1.2 Fisher Research  ...

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.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.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  ...

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.scitechantiques.com/belldiscovery

The first metal detector Dr. Bell's used on President Garfield was made using a ... In frustration they returned to a coil and circuit that Dr. Bell had created while ...

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 ...

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

Jul 20, 2014 ... As we all know, metal detectors serve a wide range of utilitarian functions all around the world. However, at the very beginning, there were ...