Metal detectors work by sending and receiving electromagnetic fields. A search coil sends an electromagnetic field into the ground. That field energizes any metal object it contacts, then the object sends an electromagnetic field back up. Once that field reaches the search coil, it is detected and an alert sounds on the metal detector.Know More
Metal detectors have a variety of uses. They have been used for archaeology since 1958. Many people use metal detectors as a hobby, looking for coins or valuable items buried underground. There are even metal detecting clubs in which hobbyists meet and socialize.
Metal detectors are also used for security purposes. Soldiers use metal detectors to search for land mines, and metal detectors are used in certain areas, such as airports, to check people for concealed weapons. They are also used to inspect goods, such as food and clothes, for metal fragments before consumers can purchase them.
The first metal detectors were created in the late 19th century. Gerhard Fisher came up with the idea of using a search coil resonating at a radio frequency, and in 1925 he obtained the first patent for a metal detector. Smaller metal detectors started being manufactured in the 1950s with the development of the transistor.Learn more about Hobbies & Games
A metal detector can be purchased from a wide variety of retailers and individual sellers in the United Kingdom. For instance, Tesco direct offers several varieties of metal detectors ranging from ?21.18 to ?85.00.Full Answer >
Metal detector manuals generally come with mechanical diagrams. Garrett and Minelab offer mechanical diagrams with their products; however, Kellyco does not offer mechanical diagrams of its metal detectors as of 2015.Full Answer >
An air hockey table works by way of a fan pumping air through tiny holes which are evenly distributed across the playing surface. The air from the fan provides lift for the puck, allowing it to glide over the smooth surface of the table.Full Answer >
An air hockey table works by using air pressure. A machine under the surface of the table blows out air through small holes across the table's surface. This air reduces friction, allowing the puck to move easily.Full Answer >