Digital level indicator

Details Digital level indicator Digital level indicator

1977-02-22

1978-03-07

Gill, James J.

Geometrical instruments

Indicator of direction of force traversing natural media

Level or plumb, terrestrial gravitation responsive

73517R, 340200, G01C 906

Patent

active

040771326

ABSTRACT:
A level indicator providing a digital display of gravity-related attitude comprises a capacitive gravimeter pickup assembly the complementary capacitor pair of which are alternately switched, on an equal-time basis, into an R.C. oscillator circuit. Concurrently, each oscillator pulse train is switched, respectively, into the up- and down-mode of reversible counting means to yield a net oscillator frequency difference directly, digitally indicative of the degree of departure from a gravity-referenced level condition.

REFERENCES:
patent: 2322681 (1943-06-01), Zenor
patent: 2848710 (1958-08-01), Owen
patent: 3438266 (1969-04-01), Carow et al.

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