Compasses

Details Compasses Compasses

1978-04-12

1980-10-14

Shepperd, John W.

Geometrical instruments

Indicator of direction of force traversing natural media

Magnetic field responsive

33355R, G01C 1708, G01C 1718

Patent

active

042273137

ABSTRACT:
A compass includes a chamber, a card, needle or the like together with suspension means which suspend the card, needle or the like within the chamber. Magnet mounting means are engaged with the card, needle or the like and a magnet is engaged with the magnet mounting means in such a manner that in use the magnet may rotate at least in a plane normal to the plane containing the card, needle or the like, and such movement does not cause any substantial movement of the card, needle or the like.

REFERENCES:
patent: 1306882 (1919-06-01), Clarke
patent: 1533683 (1925-04-01), Abbot
patent: 2177218 (1939-10-01), Klein et al.
patent: 2300710 (1942-11-01), Sperry
patent: 2446258 (1948-08-01), Burt
patent: 2803068 (1957-08-01), Mason
patent: 3349406 (1967-10-01), Perry et al.
patent: 3374549 (1968-03-01), Hanson
patent: 3568328 (1971-03-01), Sharpe
patent: 3927474 (1975-12-01), Lapeyre
patent: 4004348 (1977-01-01), Fowler et al.

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