Air bubble free compass and method of manufacturing same

Details Air bubble free compass and method of manufacturing same Air bubble free compass and method of manufacturing same

1994-11-04

1995-11-28

Cuchlinski, Jr., William A.

Geometrical instruments

Indicator of direction of force traversing natural media

Magnetic field responsive

33346, G01C 1708

Patent

active

054696313

ABSTRACT:
A method of preventing air bubbles in a compass equipped with fluid expansion capability, wherein a compass unit is assembled with a fluid expansion diaphragm; the compass unit is filled with fluid expanding the diaphragm, and sealed while maintaining the diaphragm in its expanded state for preventing air bubbles in reduced pressure and/or reduced temperature conditions, without significantly changing the basic structure of the compass.

REFERENCES:
patent: 1491593 (1924-04-01), Eriksen
patent: 1828194 (1931-10-01), Lietz
patent: 2019411 (1935-10-01), Hassel
patent: 2136970 (1938-11-01), Ekeberg
patent: 2336789 (1943-12-01), Jonsson
patent: 4004348 (1977-01-01), Fowler et al.
patent: 4236316 (1980-12-01), Suzuki
patent: 4930224 (1990-06-01), LeBlanc

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