Abstract

A method has been developed for the automatic compensation of the errors caused by bending in self-contained base range finders, especially the error arising from one-sided heating—as from sunshine, or from gravity when the elevation of the line of sight is changed. The conditions may be met in instruments of existing types and sizes. At the same time the construction is simplified and the reliability improved. The “optical tube” may be eliminated entirely in some types of range finder. These results are obtained through the use of objectives composed of two widely separated components so related to each other in power and position that the usual lateral displacements of the image on the focal plane are compensated by corresponding lateral displacements of the second principal point of the compensating objectives. The simple case in which the axis of a range finder bends in the form of a circular arc is discussed. Compensation of this kind may also be used in the designing of sighting telescopes.

© 1947 Optical Society of America

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