Geophysical Journal | 1999 volume 21 Ή3

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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