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The Development of Stereoscopic Photography and Radiography^*

This excerpt was created in the absence of an abstract.

Much scientific effort has been expended in the development of photographic and cinematographic processes which do not entail the use of any individual viewing devices. The search for the ideal method has been in progress for some half-century and still continues.

September 25, 1902, is a date of great importance in the history of the development of stereoscopic photography, for on that day Frederic Ives filed in the U.S.A. his classic patent application describing the "Parallax Stereogram and Process of Making Same", which application was subsequently granted on April 14, 1903, the specification being accorded the number 725,567.

The sketch, Fig. 1, is a diagrammatic sectional plan showing the essential elements of a camera suitable for the production of parallax stereograms, L₁ and L₂ being lenses forming images on a photographic plate or film P. The distance between the axes of L₁ and L₂ is approximately 2 inches, and consequently the disparity between the two images is substantially the same as that between the images produced by the two eyes in the human visual system.

A grid, represented by the broken line G, is arranged a short distance in front of P. This grid consists of a large number (usually between about 50 and 100 to the inch) of vertical and parallel opaque lines or strips separated by transparent spaces or strips of the same width.

^* Abridged version of a paper read before the British Institute of Radiology, March 15, 1945. The complete paper can be seen in the Mackenzie-Davidson Library at the Institute.