Products - National ...The most important goal is to put yourself on nugget bearing ground.Bell was the first inventor of the metal detector for the purpose of detecting a bullet lodged in President Garfields' body. The next question is where will most of your detecting be carried out? Info for Chicago Steel Tape Co. Hidden in the walls of that house was a treasure that at the time never occurred to me: copper tubing. Learn information about Chicago Steel Tape Co, a Manufacturer/Exporter/Importer in Watseka, IL. ...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. Have Fun. When this electromagnetic field penetrates the ground the metals tend to get charged with magnetism.
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