Surveying instrument for establishing a point in a plane and...

Details Surveying instrument for establishing a point in a plane and... Surveying instrument for establishing a point in a plane and...

G - Physics

01

C

340/136, 354/25,

G01C 15/14 (2006.01) G01C 15/00 (2006.01)

Patent

CA 1040416

ABSTRACT OF THE DISCLOSURE A direction finding system is disclosed in which a prede- termined horizontal plane is established by the projection from one location of an image having illuminated and unilluminated portions corresponding to the predetermined horizontal plane. A receiver at a remote location detects the image at two spaced points and produces an indication of the center of the transi- tion zone between the illuminated and unilluminated portions of the projected image.

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