Theory and optical schemes of levels with mirror compensators potentially not limited by tilt angles
© Lensky O.V.
The paper proves the following theorem: If A, B and L are three arbitrary points on a circle and P is a fourth point on the circle equidistant from A and B, line segment PL is the trace of a plane mirror for which AL and BL are incident and reflected rays. The design of the optical systems of leveling instruments with self - adjusting lines of sight is analyzed in terms of this theorem; the systems have pendulum - mirror tilt compensators that operate in the convergent beams behind the objective.
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