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An electric current typically energizes the electromagnet to attract and hold the steel plate, keeping the door open. Unlike electromagnetic locks, the magnetic attraction of an electromagnetic door holder is usually weak enough that it can be manually overpowered at any time by anyone, allowing the door to close. [citation needed]
Arago's rotations is an observable magnetic phenomenon that involves the interactions between a magnetized needle and a moving metal disk. The effect was discovered by François Arago in 1824. At the time of their discovery, Arago's rotations were surprising effects that were difficult to explain.
The principle behind an electromagnetic lock is the use of electromagnetism to lock a door when energized. The holding force should be collinear with the load, and the lock and armature plate should be face-to-face to achieve optimal operation. The magnetic lock relies upon some of the basic concepts of electromagnetism.
Argos was launched with thousands of staff, taking £1 million during a week in November. [10] Argos was purchased by BAT Industries in 1979 for £32 million. In 1980, Argos opened its Elizabeth Duke jewellery counter (named after a director's wife) and by 1982, was the United Kingdom's fourth-biggest jewellery retailer.
The card stores a physical or digital pattern that the door mechanism accepts before disengaging the lock. There are several common types of keycards in use, including the mechanical holecard, barcode, magnetic stripe, Wiegand wire embedded cards, smart card (embedded with a read/write electronic microchip), RFID, and NFC proximity cards.
Argos (dog), Odysseus' dog in the Odyssey; Argos (radio program), a Dutch documentary series; Eddie Argos (born 1979), English musician; Argos-Shimano, a former cycling team; Task Force Argos, a branch of the Queensland Police Service; Toronto Argonauts or Argos, a Canadian Football League team; Minister Argos, a villain from the manga and ...
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