Optical plummet azimuth reference assembly

Details Optical plummet azimuth reference assembly Optical plummet azimuth reference assembly

1978-08-25

1980-04-22

Little, Willis

Geometrical instruments

Straight-line light ray type

Vertical and horizontal angle measurer

33290, G01C 100, G01C 1500

Patent

active

041987594

ABSTRACT:
An optical plummet azimuth reference assembly having a rigid, horizontal support containing a centerline inscribed therein and a pair of upstanding elements mounted on the support located at each end of the centerline. Each upstanding element has a vertical reticle co-planar with the centerline and a horizontal reticle, the vertical and horizontal reticles forming a cross therebetween. By mounting the azimuth reference assembly directly on an optical plummet with the centerline of the azimuth reference assembly co-planar with the centerline reticle of the optical plummet, the azimuth reference line of an object aligned with the centerline reticle of the optical plummet can be accurately and quickly ascertained.

REFERENCES:
patent: 494876 (1893-04-01), Merrill
patent: 761219 (1904-05-01), Goodwin
patent: 2235898 (1941-03-01), Niemeyer
patent: 3783524 (1974-01-01), Ciani, et al.
"Applied Optics" vol. 11, No. 2, Feb. 1972, pp. 323-325.

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