Geometrical instruments – Indicator of direction of force traversing natural media – Magnetic field responsive
Patent
1995-06-30
1997-07-15
Fulton, Christopher W.
Geometrical instruments
Indicator of direction of force traversing natural media
Magnetic field responsive
33333, 33354, G01C 1708, G01C 2300
Patent
active
056471343
ABSTRACT:
A compass for mobile parabolic antenna includes a compass sphere having a transparent shell with an elevation dial and a magnetic core encapsulated by the transparent shell with fluid filled therebetween with a bubble enclosed within the transparent shell and a directional mark pointing to a fixed direction on the magnetic core, an annular plate having a location dial and a satellite name dial provided on edges of the plate, a cover plate having a central hole and a plurality of arcuated grooves, and a base plate having a circular depression, a plurality of arcuated recesses corresponding to the grooves on the cover plate defined in the depression, and a central bore corresponding to the central hole on the cover plate so that the compass sphere can be secured within the central hole and the central bore and the annular plate can be rotatably received by the circular depression when the cover plate couples with the base plate.
REFERENCES:
patent: 3084443 (1963-04-01), Kaatz et al.
patent: 4335521 (1982-06-01), Rutherford
patent: 4438568 (1984-03-01), Kramer et al.
patent: 4495706 (1985-01-01), Kaminski
patent: 4920656 (1990-05-01), Cross
patent: 5060390 (1991-10-01), Hill
patent: 5187871 (1993-02-01), McDermott
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