Recorders – Record receiver deforming
Patent
1990-03-13
1991-07-23
Miller, Jr., George H.
Recorders
Record receiver deforming
G11B 900, B43L 100
Patent
active
050347543
ABSTRACT:
This invention provides a device for visually displaying magnetic patterns assumed within or recorded on a planar medium, e.g. electrical steel sheet, comprising a transparent plate and a membrane secured to and spanning the plate defining a sealed area therebetween housing magnetic particles suspended in a liquid carrier. A field is applied by permanent magnet(s) disposed around the periphery of the plate or by an energized coil for subjecting said particles to a magnetic field in a direction normal to the plate whereby, when placed in juxtaposition with the planar medium the particles agglomerate to assume positions in conformity with the magnetic patterns.
REFERENCES:
patent: 3013206 (1961-12-01), Youngquist et al.
patent: 3320523 (1967-05-01), Trimble
patent: 3972595 (1976-08-01), Romankiw et al.
patent: 3988738 (1976-10-01), Wu
patent: 4143472 (1979-03-01), Murata et al.
Taylor Robert J.
Watt John A.
British Steel PLC
Miller Jr. George H.
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