Geometrical instruments – Straight-line light ray type – Combined
Patent
1985-05-31
1986-06-17
Little, Willis
Geometrical instruments
Straight-line light ray type
Combined
33272, 33354, 350241, 353 11, G03B 2100, G02B 2702
Patent
active
045947880
ABSTRACT:
A movable film cartridge with at least one view superimposed by a protractor image on transparent film is further provided with a compass viewed through a prism at an edge of the field of view of the film containing a map or aerial view image. A double spool cartridge contains the film and moves the film from one spool to the other reversibly by a hand-turned knob or motor. The cartridge moves vertically within the light-tight casing housing the cartridge. An eyepiece with a sealed double flap opens for viewing with the eyepiece tightly sealed against the face of a user. A button operated by the user's nose or bridge of the nose turns the interior light on for light-tight viewing. Magnified viewing of the microphotographic film may be through a single lens in a wrist mounted embodiment or through a double viewing system for stereo vision with images recorded from two different perspectives separated by the distance between the eyes of the user. Additional information may be recorded on the frames between the stereo images on the film. Vials of acid mounted interiorly may be broken for film destruction in security tight situations. A light-weight plastic casing and lens system alternately uses film mounted on circular discs. Both cartridges and discs are replaceable in the casings.
REFERENCES:
patent: 2677183 (1954-05-01), Brenner
patent: 3561153 (1971-02-01), Harper
patent: 4116533 (1978-09-01), Nerlich
patent: 4149783 (1979-04-01), Latady
patent: 4234244 (1980-11-01), Klein
patent: 4402140 (1983-09-01), Nagae
patent: 4422738 (1983-12-01), Steele
patent: 4530570 (1985-07-01), Vitac
Little Willis
Meeker Donald W.
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