She enjoys running, dancing, fencing, squash, kick boxing, paintballing and "metal detector". The modern development of the metal detector began in the 1920s. This company then acquired metal detector manufacturer Adams Electronics in 1984. Take the English examples "heavy metal detector" and "heavy-metal detector". Most have been found by metal detector since the 1970s. Alexander Graham Bell tried to locate the bullet with a primitive metal detector. Passengers can decline scanning and be screened via a metal detector and patted down. Currently, anyone without proper state credentials must go through a metal detector. In 1925 he applied for, and was granted, the first patent for a metal detector. Next, a metal detector pinpoints the location of mines. It involves a metal detector, prodding instrument and tripwire feeler. A deminer advances along a lane, swinging a metal detector close to the ground. Federal Bureau of Prisons hired Theremin to build a metal detector for Alcatraz Federal Penitentiary. Both men set off the metal detector and were put through secondary screening. There was a metal detector outside of the dining hall for security purposes.