North finder with optical transfer provision

Details North finder with optical transfer provision North finder with optical transfer provision

1980-05-12

1981-12-01

Martin, Jr., William D.

Geometrical instruments

Straight-line light ray type

Process

33275G, 33285, 350102, 356149, G01C 1938

Patent

active

043028853

ABSTRACT:
A portable gyroscopic compass surveying device includes means for rapidly aligning the apparatus with respect to geographic north, the north finder itself being operated apart from the associated theodolite on its own low mount. The transfer of the azimuth reference data is accomplished optically by sighting the theodolite telescope on a retro-reflector associated with the north finder. Because the north finder is physically separated from the theodolite, sightings may be made by the theodolite operator while the undisturbed north seeking operation is in process, significantly shortening the total time of operation at each station.

REFERENCES:
patent: 3098306 (1963-07-01), Dinter, Jr.
patent: 3567326 (1971-03-01), Smith-Vaniz
patent: 3936947 (1976-02-01), Knapp

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