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  Hand-held Metal Detectors are designed to safeguard security-sensitive areas like schools, courtrooms, corrections facilities, sports events, businesses, nightclubs, bars and other public areas and events. They are used along with walk-through metal detectors. In 1881, Alexander Graham Bell constructed one of the world’s first metal detectors in an attempt to find an assassin’s bullet …

  The first metal detector was created in 1881 by Alexander Graham Bell to detect the bullet lodged in the body of President James Garfield when he was assassinated. The first portable version was patented in 1931 by Fischer. Since then, this instrument has become very common. Here are some insights on the workings of …