Geometrical instruments – Miscellaneous – Light direction
Patent
1988-08-31
1989-12-26
Haroian, Harry N.
Geometrical instruments
Miscellaneous
Light direction
G03B 2100
Patent
active
048888737
ABSTRACT:
Apparatus providing an aid to navigation comprising two circular discs which are superposed and rotatably mounted with respect to one other, the upper disc presenting a transparent zone corresponding to a geographical area, for instance a closed stretch of water, with indication of some coastal places or localities. The latter disc carries moreover a peripheral circular graduation divided over 360.degree., the "0" point of which is situated to the north of said geographical area. So far as the base disc is concerned, its upper face is provided with parallel straight lines and carries two indexes situated at the ends of the diameter parallel to these lines. It is sufficient, to determine the course to be followed for travelling from one of the indicated places to another, to rotate the rotatable disc with respect to the stationary disc to bring the points corresponding to these two places to lie on one and the same line of the set of parallel lines. The index of the base disc which is closest to the "0" point then indicates the correct course with respect to the graduation.
REFERENCES:
patent: 2407893 (1946-09-01), Meyer
patent: 3094781 (1963-06-01), Vangor
patent: 3643333 (1972-02-01), Pepper
patent: 3724079 (1973-04-01), Jasperson
patent: 3844041 (1974-10-01), Wilson
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