Hand compasses

Details Hand compasses Hand compasses

1977-03-07

1978-09-05

Stearns, Richard R.

Geometrical instruments

Indicator of direction of force traversing natural media

Magnetic field responsive

33364, G01C 1706, G01C 1708

Patent

active

041109147

ABSTRACT:
A compass design particularly for wrist mounted and hand held compasses which includes a first exterior, fluid tight case having a pair of pivot members respectively on the upper and lower surfaces thereof for rotatably mounting a second interior case member which second case member is provided with a horizontally pivotal magnet body which magnet body is permitted to move a predetermined degree with respect to a normal horizontal position to accommodate for magnetic inclination and which outer case is filled with liquid to place the inner case in substantial equilibrium between the pivot members such that the inner magnet bearing case will be substantially frictionally free to rotate in the outer case.
The mounting for the magnet body within the inner case allows the magnet body to oscillate and therefore provide free movement even though the magnet is not held in a horizontal position.

REFERENCES:
patent: 1533683 (1925-04-01), Abbot
patent: 2446258 (1948-08-01), Burt

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