Metal detectors use electromagnetic induction to detect metal. In 1881, Alexander Graham Bell constructed a crude metal detector in an attempt to find an assassin's bullet in President James Garfield. Gerhard Fischar patented a portable version in 1931. In 1881, Alexander Graham Bell constructed a crude metal detector in an attempt to find an assassin's bullet in President James Garfield. Gerhard Fischar patented a portable version in 1931. Upright "archway" detectors are used at entrances to secured buildings, such as courthouses or airports, to detect metallic weapons which may be brought in. Small portable "wand" detectors are used by security staff to frisk persons for the same. Larger portable metal detectors are used by treasure hunters to locate metallic items, such as jewelry or coins, buried shallowly underground. There are three types of metal detectors: beat frequency oscillator, induction balance, and pulse induction
Metal Detectors and Metal Detecting > Metal detectors > Metal Detector products - Kellyco Metal Detectors - 5 Star Dealer - Since 1955

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URL: http://www.kellycodetectors.com/indexmain.htm
Date Submitted: 01/07/06
Description: Metal Detectors & Metal Detector Supplies. Free shipping on your Metal Detector. Providing quality, easy to use metal detectors for beginners to experts since 1955. Real Experts to help you. 5 star dealer.
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