Inside the Metal Detector offers hard-to-find information on the technology behind metal detectors. Author interviews, book reviews, editors' picks, and more. Inside the Metal Detector: The First In-depth Book on Metal Detector Technology Since on medical-site.info *FREE* shipping on qualifying offers. Inside The Metal Detector - Kindle edition by George Overton. Browse Best Books of the Month, featuring our favorite new books in more than a dozen.
|Language:||English, Spanish, Dutch|
|Distribution:||Free* [*Register to download]|
Inside the Metal Detector book. Read reviews from world's largest community for readers. Included are hands-on experiments and complete metal detector projects in every category. A list of resources includes web sites, books, magazine articles, and. Inside the Metal Detector by Carl Moreland, , available at Book Depository with free delivery worldwide.
He committed to detect at every low tide.
Not just the ones during the day—the ones in the middle of the night, too! Metal detecting is not all about luck like one might think.
To improve on his time invested, Jim started keeping track of all of his finds. After some time of recording his finds, he started to see patterns.
With this information, Jim taught himself exactly which conditions were needed for the greatest return of his time and effort. Just looking at the beach and waves for a few seconds, he is able to determine the likelihood of a successful day.
Using this method, Jim is more likely to find the gold. The first year that Jim started keeping track of his finds was In that year, Jim found gold items. His statistics revealed that gold rings come in bunches and if he found one ring in a day, he was likely to find another.
Jim is often asked by people on the beach what his best find is. As impressive as this find is, it seems Jim is more excited to share the stories he has collected along the way—like the time he found a huge, gold class ring. He found a name engraved on the inside. Whenever Jim finds a ring with a name, he does his best to find the rightful owner and return it. So, Jim reached out to the college and was able to eventually make contact with the owner of the ring and mail it to him.
A few weeks later, he received a handwritten letter in the mail. The man explained that he loved the ring so much he actually had ordered an identical one to replace the one that was lost.
He was thrilled the way things worked out because he was not sure which of his two daughters would be willed the ring and now he had one for each of them. Metal detectors have advanced significantly over the years and Jim continues to upgrade his equipment. Currently he is using a Minelab Equinox This is a waterproof detector, which is essential since Jim does a majority of his hunting in the surf. Although it helps as a guide, metal detectors will often provide the same message for a bottle cap or penny as they do for a ring.
Other times, Jim will swing over an area, get a signal and know that it is just a piece of iron and not waste his time and energy digging it up.
All of this comes from years of experience. Over time, Jim has seen the beach change drastically and then back again. Fighting against the sand brought in by beach renourishment projects has been a thorn in his side when it comes to detecting. Many of the hurricanes that have come through the area have yielded a similar sanded-in beach. The closer you move the transmitter coil to the piece of metal, the stronger the magnetic field the transmitter coil creates in it, the stronger the magnetic field the metal creates in the receiver coil, the more current that flows in the loudspeaker, and the louder the noise.
So thank you, James Clerk Maxwell, for helping us see how metal detectors work—by using electricity to create magnetism, which creates more electricity somewhere else. How metal detectors work What make a metal detector buzz when you sweep it over buried treasure? Why is it important to keep the detector moving?
A battery in the top of the metal detector activates the transmitter circuit red that passes electricity down through a cable in the handle to the transmitter coil red at the bottom. When electricity flows through the transmitter coil, it creates a magnetic field all around it. If you sweep the detector above a metal object such as this old gray spanner , the magnetic field penetrates right through it. The magnetic field makes an electric current flow inside the metal object. This flowing electric current creates another magnetic field all around the object.
The magnetic field cuts through the receiver coil blue moving about up above it. The magnetic field makes electricity flow around the receiver coil and up into the receiver circuit blue at the top, making a loudspeaker buzz and alerting you you've found something. How deep will a metal detector go? There's no exact answer to that question, unfortunately, because it depends on all kinds of factors, including: The size, shape, and type of the buried metal object: bigger things are easier to locate at depth than small ones.
The orientation of the object: objects buried flat are generally easier to find than ones buried with their ends facing downward, partly because that creates a bigger target area but also because it makes the buried object more effective at sending its signal back to the detector. The age of the object: things that have been buried a long time are more likely to have oxidized or corroded, making them harder to find.
The nature of the surrounding soil or sand you're searching. Generally speaking, metal detectors work at a maximum depth of about 20—50cm 8—20in.
Where are metal detectors used? Metal detectors aren't just used to find coins on the beach.
You can see them in walk-through scanners at airports designed to stop people carrying guns and knives onto airplanes or into other secure places such as prisons and hospitals and in many kinds of scientific research.
Archeologists often frown on untrained people using metal detectors to disturb important artifacts but, used properly and with respect, metal detectors can be valuable tools in historic research.
Photo: This wand-type detector, called a SuperScanner and made by Garrett Metal Detectors, is being used to check visitors to a medical clinic in Afghanistan.
It runs off a built-in 9-volt battery that provides about 60 hours of continuous operation.
If you find metal, the detector lets you know with a combination of flashing LED lights and a warbling noise. It's 42cm Who invented metal detectors? Garfield in July One of the bullets aimed at the President lodged inside his body and couldn't be found.
Telephone pioneer Alexander Graham Bell promptly cobbled together an electromagnetic metal-locating device called an induction balance , based on an earlier invention by German physicist Heinrich Wilhelm Dove. Although the bullet wasn't found and the President later died, Bell's device did work correctly, and many people credit it as the very first electromagnetic metal locator. Artwork: Left: Find that bullet!
This sketch by William A. Skinkle, from Frank Leslie's illustrated newspaper of August 20, , shows rather a lot of doctors! The room on the left contains the equipment, on the table-top, which is labelled "interrupter," "condenser," and "battery" the boxes at the back of the table. You can just make out wires that stretch around the bottom of the picture through to the President's bed on the right.
Presumably Alexander Graham Bell is the bearded man talking on the telephone on the right? Courtesy of US Library of Congress. Portable metal detectors were invented by German-born electronics engineer Gerhard Fischer which he also spelled "Fisher" while living in the United States, and he applied for a patent on the idea in January He called his invention the Metalloscope—a "method and means for indicating the presence of buried metals such as ore, pipes, or the like"—and you can see it in the drawing here.
The same year, he founded Fisher Research Laboratory, which remains a leading manufacturer of metal detectors to this day. Dr Charles L. Garrett, founder of Garrett Electronics, pioneered modern, electronic metal detectors in the early s. After working for NASA on the Apollo moon-landing program, Garrett turned his attention to his hobby—amateur treasure hunting—and his company revolutionized the field with a series of innovations, including the first computerized metal detector featuring digital signal processing, patented in The transmitter coil is in the red box at the front; the receiver coil is in the blue box at the back.
The transmitter uses inaudible 30, Hz signals; the receiver sends out audible signals with a frequency of about Hz to headphones, as in a modern metal detector.
The transmitter and receiver coils are mounted at right angles to one another so the receiver doesn't pick up signals directly from the transmitter.
What about nonmetal detectors? Treasure hunters will always value metal detectors like these because, historically, valuable things were usually made of metal.
But in the world of security, it's no longer enough to rely on metal detectors as our sole line of defence.