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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

Back in the mid 1800s, after the invention of electricity, many scientists, ... of metal detectors as we know them today include transistors - invented in 1947 by ...

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.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  ...

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 ...

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. ... so Alexander Graham Bell, the inventor of the telephone, designed a device that could ...

www.softschools.com/inventions/history/metal_detector_history/376

The first metal detector was made by Gustave Trouv√©, a French electrical engineer, in 1874. He made it to find and remove bullets or other metal objects from ...

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 ...