Automatic level

Details Automatic level Automatic level

1976-12-16

1979-03-06

McGraw, Vincent P.

Optics: measuring and testing

Fiducial instruments

Artificial reference

350 10, 350 47, G01C 100

Patent

active

041428005

ABSTRACT:
This automatic level comprises an optical compensator for non-horizontality, an image erecting device and an optical focusing system. The compensator, the image erector and the focusing system consist of an assembly of three reflecting element disposed in the fashion of a "Crova" prism, two of said reflecting elements being disposed on a support suspended from the case of the apparatus by means of a pair of flexion bars so selected that said two reflecting elements rotate through an angle equal to one-half the angle formed by the optical axes of the objective and eyepiece of the level with respect to the horizontal when the case departs slightly from its horizontal position, the distance between said objective and one of said two reflecting elements being equal to the distance between other of said two reflecting elements and the reticule, and the third and intermediate reflecting element is movable in a substantially vertical direction.

REFERENCES:
patent: 2638032 (1953-05-01), Kieffer et al.
patent: 2981141 (1961-04-01), Armstrong et al.
patent: 3220297 (1965-11-01), Baker et al.
patent: 3610764 (1971-10-01), Huther
patent: 3729266 (1973-04-01), Mason et al.

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