Optical instrument for measuring angles

Optics: measuring and testing – Angle measuring or angular axial alignment – Apex of angle at observing or detecting station

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Details

33283, G01C 110

Patent

active

045764786

ABSTRACT:
A pendulum is mounted between an eyepiece and a fixed reflector facing a movable reflector carried by an adjustment member. First and second sight guides are mounted on the pendulum in alignment with a longitudinal axis which is perpendicular to the axis of the pendulum and this longitudinal axis is movable into coincidence with the axis of the eyepiece. The axis of the eyepiece is thus aligned horizontally, by gravity, without having to view the horizon through the eyepiece.

REFERENCES:
patent: 544212 (1895-08-01), Croskery
patent: 2411870 (1946-12-01), Chauvet

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