Visual-display device with error correction

Details Visual-display device with error correction Visual-display device with error correction

1978-12-28

1980-08-26

Martin, Jr., William D.

Geometrical instruments

Miscellaneous

Light direction

33317D, 33348, 33356, 116202, 116327, 116DIG5, G02B 2702

Patent

active

042188229

ABSTRACT:
In order to correct errors in the reading of a graduated scale, especially on a compass card driven by a damped gyroscopic system, the scale is juxtaposed with a block having slits simultaneously alignable with different scale graduations and illuminable by respective light sources within the block. The light sources can be selectively energized by a rotary switch whose bank contacts are connectable via a changeover switch to either of two groups of light sources for positive or negative deviations from a reference position; the slit so illuminated serves as a pointer by coacting with a confronting scale graduation.

REFERENCES:
patent: 43036 (1864-06-01), Martin
patent: 2023891 (1935-12-01), Kaess
patent: 2178306 (1939-10-01), Lauck
patent: 2323253 (1943-06-01), Sperry
patent: 2589263 (1952-03-01), Kenosian
patent: 3677619 (1972-07-01), Mackenzie

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