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 > Garrett.com - Home of Metal Detectors

options Details of "Garrett.com - Home of Metal Detectors"
URL: http://www.garrett.com/
Date Submitted: 01/07/06
Description: In the mid-1960s Charles and Eleanor Garrett introduced the world to The Hunter, the first Zero Drift, Dual Searchcoil detector ever made. And with it they espoused a new philosophy that challenged the way the world would forever view the metal detection industry. "We will build the best possible metal detector and offer the best customer service," they said.
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