Geometrical instruments – Straight-line light ray type – Process
Patent
1981-11-17
1990-04-03
Martin, Jr., William D.
Geometrical instruments
Straight-line light ray type
Process
33 1B, 33262, 33268, 33277, G01B 312
Patent
active
049128531
ABSTRACT:
A reticle plate provided with a reticle and three concentric circles of ving diameter and methods of use thereof, the invention allows a user to establish a north-oriented or south-oriented line by alignment of selected circumpolar stars with the circles. The circles are located on the reticle plate in positions determined by angles which exist between the celestial north (or south) pole and the particular low-magnitude circumpolar stars chosen as sighting points, the radii of the circles being directly proportional to the objective lens focal length of the theodolite or optical instrument within which the plate is used. A first method of the invention allows unambiguous location of the north or south pole by alignment of each of three selected stars with one each of the three circles. A second method provides data to a user sufficient to locate the pole by alignment of innermost and outermost circles respectively with one each of two of the selected stars.
REFERENCES:
patent: 2432958 (1947-12-01), Wenzel
patent: 2450712 (1948-10-01), Brown
patent: 2460346 (1949-02-01), Hagner
patent: 2806287 (1957-09-01), Sullivan
patent: 3003258 (1961-10-01), Stefano
patent: 3190003 (1962-03-01), O'Brien
patent: 3383987 (1968-05-01), MacMillan
patent: 3392450 (1968-07-01), Herter et al.
patent: 3752591 (1973-08-01), Feldman
patent: 3858326 (1975-01-01), Hurd
patent: 4057902 (1977-11-01), Matsui
patent: 4205916 (1980-06-01), Vogl et al.
Dere Donald P.
McDonnell Michael M.
Hollis Darrell E.
Martin, Jr. William D.
The United States of America as represented by the Secretary of
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