Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1977-04-11
1979-05-01
Moose, Jr., Harry E.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
313479, 315 8, 335214, G05F 700
Patent
active
041527453
ABSTRACT:
A magnetic shield device is provided wherein an object to be shielded from an ambient field is surrounded by a hollow member of high permeability material which has an opening therein permitting visual or other access to the object but also permitting possible entry of a disturbing portion of the ambient field. A counter magnetic field for opposing and cancelling the disturbing field portion is produced by current flow through a conductor wound around the path of the disturbing field portion, the conductor preferably being in the form of a solenoid coil wound around a tubular portion of the member. A DC current may be applied and/or the conductor may be short-circuited with the current being produced from a counter electromotive force induced from changes in the ambient field.
REFERENCES:
patent: 2343630 (1944-03-01), Atwood
patent: 2907914 (1959-10-01), Brownell
patent: 3018401 (1962-01-01), Stanley
patent: 3824515 (1974-07-01), Holman
Lund Van Meter
Moose Jr. Harry E.
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