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A pulsing current is applied to the coil, which then induces a magnetic field shown in blue. When the magnetic field of the coil moves across metal, such as the coin in this illustration, the field induces electric currents (called eddy currents) in the coin. The eddy currents induce their own magnetic field, shown in red, which generates an opposite current in the coil, which induces a signal indicating the presence of metal.

If you are planning to buy a metal detector to join the treasure-hunting fun, here are some tips to guide you so that youll get the best deal possible. Metal detectors can be pricey, so youve got to invest your money well. 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 in President James Garfield. Fischer patented a portable version in 1931.

Go Metal Detecting and Find a Treasure Trove Right in Your Own Backyard

You just bought your very own metal detector and you are itching to use it to find some interesting treasures. The only problem is, you don't have the funds to go to a particular metal detecting hot spot, as there aren't any within your immediate vicinity. To go metal detecting, you are going to have to wait for the next long weekend, plan the trip, and gather enough funds to spend on it. The truth is, however, that the answer to your metal detecting woes is already in front of you - or rather, behind you, because you can actually go metal detecting right in your very own backyard. This works particularly well for those who are only starting out with metal detecting and have yet to get a good grasp on the activity. The backyard of your very own home is a great place to practice and learn metal detecting. Plus, it's the best feeling in the world when you find a treasure right on your own property!

The backyard is best for beginners in metal detecting because usually a backyard is not as overloaded with signals as a lot of other metal detecting places are. It does, however, have enough items and materials hidden in its depths to allow you to learn the signals that your metal detector gives out for particular pieces or types of metals.

When buying a metal detector consider the price. If the metal detector offers the best features of a then expect it to be expensive. If having fewer features is all right with you, go for a less expensive one. Metal detectors can run from as low as $50 to higher than $800. Any place there is construction and the ground is being cleared, that is a great place to start treasure hunting. Successfull treasure hunting starts with having the right metal detector. But which type of metal detector should you get? Complete info on metal detectors and treasure hunting at http://detect-metal.info.

Inside the house a likely place for a loose board hiding hole would be in the kitchen, or the master bedroom. A loose stone in the fireplace is another possibility. Don't overlook old Barns, sheds, and garages that children could play in and where someone working could have something drop out of their pockets.

The good news is that prices have never been lower for such easy to use full featured automatic detectors. A good way to view the purchase is to decide how much money you are comfortable spending. Youve got to buy a metal detector that could withstand normal wear and tear longer than its competitors. The longer the metal detector can serve you, the better your return on investment will be. Remember, the higher the coil is above the surface the more depth you will lose. If they've got a old coin that is 6 in. below the surface, and your detector can detect 8 in., and the coil is 3 in. above the ground, you will miss that target. If the coil had been directly upon the ground you would be able to detect that target. Find the best gold metal detector today and start treasure hunting!

Metal detecting in your own backyard is also much cheaper, because it's practically free! Your backyard also allows you to go metal detecting as often as you want, whatever time or day it is. Furthermore, metal detecting in your own backyard gives you privacy. Often other metal detecting places will be swamped with tourists or other metal detecting hobbyists. If you are not yet confident with your metal detecting techniques and are only beginning to get the hang of it, the backyard is the best place to start, because no one will see you mess up!

Here are some other tips when you go metal detecting in your own backyard:

1. Go metal detecting after it has rained, when the ground is soaked. The wet soil will enable your metal detector to absorb signals from deeper parts of the ground.

2. With metal detecting, patience is very important. For every treasure or valuable item you find, you would've stumbled upon a dozen other items that are totally useless. It's all about being patient and looking really hard.

So start metal detecting now! Who knows what kind of treasures you'll find in your own backyard?

When hand-held detectors are switched on, a red signal pattern in transmitted from the coil to the ground. When the signal comes in contact with a metal, it interrupts the signal and the detector alerts the user with an audio signal and flashing lights. So next time you loose that ring at the beach or you dime at the park remember there are ways to find you beloved object. Have Fun.

Remember, the higher the coil is above the surface the more depth you will lose. If they've got a old coin that is 6 in. below the surface, and your detector can detect 8 in., and the coil is 3 in. above the ground, you will miss that target. If the coil had been directly upon the ground you would be able to detect that target. Prices of used metal detectors vary from $275 to $700 for all-purpose metal detectors. Underwater metal detectors can cost around $500.