Electronic level apparatus and method

Details Electronic level apparatus and method Electronic level apparatus and method

1989-03-01

1990-06-12

Will, Thomas B.

Geometrical instruments

Indicator of direction of force traversing natural media

Level or plumb, terrestrial gravitation responsive

33384, G01C 906

Patent

active

049321323

ABSTRACT:
This invention relates to an electronic level apparatus wherein a hollow torus is rotatably mounted in the level. A body of ferromagnetic fluid creates a horizontal reference and is sensed to provide an audible signal when a predetermined angular orientation is detected by the sensor.

REFERENCES:
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patent: 3839904 (1974-10-01), Stripling et al.
patent: 3984918 (1976-10-01), Chaney
patent: 4003134 (1977-01-01), Adams
patent: 4073062 (1978-02-01), Wright
patent: 4182046 (1980-01-01), Ludlow et al.
patent: 4590680 (1986-05-01), Hanchett et al.
patent: 4590682 (1986-05-01), Koch
patent: 4720920 (1988-01-01), Tudek

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