Geometrical instruments – Straight-line light ray type – Rod or target
Patent
1993-06-10
1995-02-28
Fulton, Christopher W.
Geometrical instruments
Straight-line light ray type
Rod or target
356 501, 359529, 359833, G02B 5122, G01C 1500
Patent
active
053925211
ABSTRACT:
A surveyor's retro-reflective device, such as a corner cube prism, is striped along the reflective surfaces to provide an internal visual center target. The precise center of the prism is identified by the visual target which allows the prism to be used both for distance measuring purposes as well as visual alignment for the one step setting of surveying points or locations. The corner cube prism has the ridges of the intersecting reflective surfaces on the back of the prism striped or lined either with a stripe having equal thickness or tapered towards the center apex of the prism. The stripes are formed with a highly visible paint, ink, tape, or sheet material. This arrangement produces a highly visible visual center target. The prism target can be mounted in an enclosed case and the case can be rigidly mounted or tiltably mounted on a horizontal axis to tilt the prism in a vertical direction for use in mountainous terrain. A large exterior target and mount can be provided for centrally mounting the prism and case and tilting mounting the exterior target with the prism so that the two can move together. The tilt axis of the exterior target and prism target are aligned to pass along the front face of the target and through a hypothetical forward offset plane within the prism upon which the visual center target appears to lie.
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