On the invention of stereoscopic glasses for single pictures : with preliminary observations on the stereoscope, and on the physiology of stereoscopic vision / by T. Wharton Jones.

  • Jones, Thomas Wharton, 1808-1891.
Date:
1860
Catalogue details

Licence: Public Domain Mark

Credit: On the invention of stereoscopic glasses for single pictures : with preliminary observations on the stereoscope, and on the physiology of stereoscopic vision / by T. Wharton Jones. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    ON THE RELIEF OR INTAGLIO OF OBJECTS, AS OBSERV- ABLE IN NATURE WITH THE TWO EYES, COMPARED WITH THAT IN WHICH THEIR REPRESENTATIONS ARE COMMONLY MADE TO APPEAR IN THE STEREO- SCOPE. The nearer the distance at wliich we view real objects, the more fully do they appear in relief, both as a whole and in their several parts. They a23pear more fully in relief as a whole, because the two eyes receive more dissimilar perspectives of them, as regards position, in the field of view. They appear more fully in relief in their several paids, because we see more of them with the one eye on one side, and with the other eye on the other side; the two eyes thus receiving more dissimilar perspectives of the objects in respect to form. The further the distance at which we view the objects, the less fully do they appear in relief, both as a whole and in their several parts. This is because the optic axes being less convergent, the two eyes receive less dissimilar perspectives of the objects, both in regard to position and form. When the objects are so very far off, that in looking at them the optic axes are parallel, the per- spectives received by the two retmse are similar. The resulting appearance to the mind, therefore, presents no more rehef than if one eye only were used. To apply what has now been recapitulated to the appearances observed in viewing the natural landscape : —in viewing the natural landscape with both eyes.