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  1. The instrument has been built by the Mann Instrument Company and the author is indebted to Mr. David W. Mann and his assistant, Mr. K. W. Harper, for their working out of the constructional details. He is also indebted to Mr. George A. Thorne, Jr. for his active support of the project, and to the American Geographical Society for-the facilities which it has placed at his disposal.
  2. E. Deville, On the Use of the Wheatstone Stereoscope in Photographic Surveying, Trans. Roy. Soc. Canada 8, 63 (1902).
  3. For brief descriptions of other developments in plotting instruments in which real index marks are used, see O. von Gruber, Photogrammetry: Collected Lectures and Essays, translated from the German original by G. T. McCaw and F. A. Cazalet, American Photographic Publishing Co., Boston, 1932, pp. 176–181, 221–223.
  4. Such a device has other uses. For instance, by employing a pair of optical linkages, one for each eye, the field of view of a compound stereoscope may be traversed from side to side by the optical axes of the binocular objectives without moving the eyes or the photographs, thus enabling the observer to fuse stereoscopically homologous rays without eyestrain. By employing a combination of two linkages for each eye the field of view of a stereoscope may be completely traversed by the optical axes of the binocular objectives both from side to side and up and down without moving the eyes or the photographs. Magnification of the field of view could then be introduced to any extent desirable. One other essential feature of the linkage is that the image, as seen by the observer, remains erect no matter in what direction the optical axis of the objective is pointing and this is accomplished without the use of a rotating "dove" prism.
  5. A further interesting geometrical property of this device, which can be deduced, is that the speed of rotation of the arm SA about S is always twice that of the arm SC.
  6. Reference 3, pp. 330–331.

Deville, E.

E. Deville, On the Use of the Wheatstone Stereoscope in Photographic Surveying, Trans. Roy. Soc. Canada 8, 63 (1902).

Mann, David W.

The instrument has been built by the Mann Instrument Company and the author is indebted to Mr. David W. Mann and his assistant, Mr. K. W. Harper, for their working out of the constructional details. He is also indebted to Mr. George A. Thorne, Jr. for his active support of the project, and to the American Geographical Society for-the facilities which it has placed at his disposal.

von Gruber, O.

For brief descriptions of other developments in plotting instruments in which real index marks are used, see O. von Gruber, Photogrammetry: Collected Lectures and Essays, translated from the German original by G. T. McCaw and F. A. Cazalet, American Photographic Publishing Co., Boston, 1932, pp. 176–181, 221–223.

Other

The instrument has been built by the Mann Instrument Company and the author is indebted to Mr. David W. Mann and his assistant, Mr. K. W. Harper, for their working out of the constructional details. He is also indebted to Mr. George A. Thorne, Jr. for his active support of the project, and to the American Geographical Society for-the facilities which it has placed at his disposal.

E. Deville, On the Use of the Wheatstone Stereoscope in Photographic Surveying, Trans. Roy. Soc. Canada 8, 63 (1902).

For brief descriptions of other developments in plotting instruments in which real index marks are used, see O. von Gruber, Photogrammetry: Collected Lectures and Essays, translated from the German original by G. T. McCaw and F. A. Cazalet, American Photographic Publishing Co., Boston, 1932, pp. 176–181, 221–223.

Such a device has other uses. For instance, by employing a pair of optical linkages, one for each eye, the field of view of a compound stereoscope may be traversed from side to side by the optical axes of the binocular objectives without moving the eyes or the photographs, thus enabling the observer to fuse stereoscopically homologous rays without eyestrain. By employing a combination of two linkages for each eye the field of view of a stereoscope may be completely traversed by the optical axes of the binocular objectives both from side to side and up and down without moving the eyes or the photographs. Magnification of the field of view could then be introduced to any extent desirable. One other essential feature of the linkage is that the image, as seen by the observer, remains erect no matter in what direction the optical axis of the objective is pointing and this is accomplished without the use of a rotating "dove" prism.

A further interesting geometrical property of this device, which can be deduced, is that the speed of rotation of the arm SA about S is always twice that of the arm SC.

Reference 3, pp. 330–331.

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