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Metal Detecting

fisher gold bug pro detector 

 

Metal detectors have been used since the end of the 19th century to search for ore-bearing rock. Early instruments were crude, dependent on battery power, and didn't work very well. Alexander Graham Bell (inventor of the telphone) used such a device in an attempt to locate a bullet lodged in the chest of American President James Garfield, in 1881. Gerhard Fisher modernized metal detectors in the 1920s when he developed a system of radio direciton-finding for navigation. He found it worked searching for ore paring rocks, andd in 1925 was gfranted the first patent for a metal detector. Subesequent refinements made the device very useful in wartime. Further refinements in the 1950s led to a machine developed by Charles Garrett.

 

Modern top models are fully computerized, using integrated circuit technology to allow the user to set sensitivity, discrimination, track speed, threshold volume, notch filters, etc., and hold these parameters in memory for future use. Compared to just a decade ago, detectors are lighter, deeper-seeking, use less battery power, and discriminate better. Larger portable metal detectors are used by archaeologists and treasure hunters to locate metallic items, such as jewelry, coins, bullets, and other various artifacts buried shallowly underground.

 

The simplest form of a metal detector consists of an oscillator producing an alternating current that passes through a coil producing an alternating magnetic field. If a piece of electrically conductive metal is close to the coil, eddy currents will be induced in the metal, and this produces an alternating electric field of its own. If another coil is used to measure the electric field (acting as a magnetometer), the change in the magnetic field due to the metallic object can be detected.

. . . Wikipedia/Metal Detectors

 


How do metal detectors work? See "How To" videos from Fisher Labs.


For complete list of headphones and metal detectors, please page through our complete Mr. Detector Catalogue. (Index is on page 3)

Details with color illustrations for various supplies can be found on the pages below.

 

Headphones

Metal Detectors

Metal Detectors - by manufacturer

Falcon
Fisher
Garrett
Minelab
Tesoro
White's

 

 

Mr.Detector, pdf online catalogue. If we don't have it in stock at our store, we can order it for you.

Prices subject to change without notice.