Device for optic, preferably visual determination of a...

Details Device for optic, preferably visual determination of a... Device for optic, preferably visual determination of a...

G - Physics

01

B

33/49

G01B 9/00 (2006.01) G01B 11/00 (2006.01) G01C 21/00 (2006.01) G01D 5/38 (2006.01)

Patent

CA 1110059

ABSTRACT A device for visually determining a plane. When visually viewing the device which is preferably stationary, information is received whether or not one is in the plane defined by the device. Information also is received on how to move in relation to the device being viewed in order to be in the plane defined by the device. The device comprises two screen units with the first screen forming an angle with the second screen which second screen is located behind the first screen. The first screen has a finer division than the rear screen thereby creating interference patterns when light falls through the screens.

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