Geometrical instruments – Straight-line light ray type – Multisight line
Patent
1980-09-25
1983-05-17
Martin, Jr., William D.
Geometrical instruments
Straight-line light ray type
Multisight line
33 15D, G01C 300
Patent
active
043833721
ABSTRACT:
The present invention is directed to an instant position finder and course plotter. A first embodiment of the present invention relates to a three arm protractor which includes a circular base member, a fixed central arm and a movable left and right arm. Each arm of the protractor includes a sight at each extreme end which work in conjunction with a central sight in the circular base portion to permit an individual to accurately align the three arms of the protractor with three visible charted objects. A second embodiment of the present invention relates to an instant position finder and course plotter which utilizes sextant type mirrors to reflect the right and left objects being viewed onto target mirrors positioned on the apex of the base. The center object is sighted over the two target mirrors through a scope mounted at the rear of the instrument. The second embodiment of the present invention enables an individual to see all three objects simultaneously.
REFERENCES:
patent: 564203 (1896-07-01), Leeds
patent: 564490 (1896-07-01), Weidner
patent: 2328517 (1943-08-01), Von Opel
patent: 2419597 (1947-04-01), Rushmore
patent: 2531248 (1950-11-01), Belch
patent: 2697234 (1954-12-01), Sturdevant
patent: 3410642 (1968-11-01), Chase
patent: 3876313 (1975-04-01), Messler et al.
Navigator's Tools, Land's End Publishing Corp., Jan. 1, 1971, p. 274.
Beurer Frederick C.
Zane Anthony J.
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