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A metal detector is an instrument that detects the nearby presence of metal. Metal detectors are useful for finding metal objects on the surface, underground, and under water. A metal detector consists of a control box, an adjustable shaft, and a variable-shaped pickup coil. When the coil nears metal, the control box signals its presence with a ...
Although the actual inventor of the hand-held metal detector is disputed, the hand-held metal detector was made in 1925 and was first patented by Dr. Gerhard Fisher in 1931. A metal detector had been invented some forty years earlier (1881) by Alexander Graham Bell for the sole purpose of locating a lead bullet in President James A. Garfield.
Later in 1970, sky marshall staffing was increased, and some passengers fitting a behavioral profile were screened for weapons (including with handheld metal detectors). [ 49 ] On November 10, 1972, a trio of hijackers threatened to fly Southern Airways Flight 49 into a nuclear reactor at Oak Ridge National Laboratory .
The OPENGATE system is a battery-operated walk-through detector that consists of two free-standing pillars that are 6 feet tall. Metal-detecting hand wands were also purchased and can be used in ...
On September 11, hijackers Khalid al-Mihdhar, Majed Moqed, and Nawaf al-Hazmi all set off the metal detector. Despite being scanned with a hand-held detector, the hijackers were passed through. Security camera footage later showed some hijackers had what appeared to be box cutters clipped to their back pockets. [9]
August 7, 2024 at 8:28 AM. Palm Beach County students head back to school on Monday. When they do, every high schooler in the county will walk through a metal detector, and every student of all ...
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