What are the benefits of nonmetallic boxes?
Metal detectors are electronic devices that are used to find traces of metal usually from the ground , a person, or cargo. This metal could be anything from discarded pieces of aluminum to buried treasures . These devices can penetrate sand , soil, wood and other non-metallic substances . A basic metal detector consists of an electronic box and a battery case on one end, with a handle for the operator's arm . There is a coil, which consists of an insulated wire around a telescoping shaft and into a round plastic disk. This disk comes off the shaft at an angle, which allows it to be held parallel to the ground. The operator grips the electronic box and turns on the power to slowly sweep the coil end over the ground until an electronic signal is heard. This indicates the presence of some metallic element buried beneath the area swept by the coil . Metal detectors work on the principal of electromagnetism and their effects on conductive metals. The high- powered co...