On binocular vision and the stereoscope : a lecture delivered at the London Institution, March 19, 1862 / by William B. Carpenter.
- Carpenter, William Benjamin, 1813-1885.
- Date:
- 1862
Licence: Public Domain Mark
Credit: On binocular vision and the stereoscope : a lecture delivered at the London Institution, March 19, 1862 / by William B. Carpenter. Source: Wellcome Collection.
Provider: This material has been provided by King’s College London. The original may be consulted at King’s College London.
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![maw two outline perspectives of any geometrical solid as it pre- sents itself to each eye respectively, and then place these two dis- similar pictures in an instrument which shall throw their images upon the corresponding points of the two retinue, so for is the dis- similarity of these pictures from being a source of confusion or embarrassment, that it forces on our minds the resultant percep- t,ion of solidity which we do not derive from either outline sepa- rately. Thus, in the subjoined figure, the visual combination of the upper pair of perspectives gives the notion of a projecting truncated pyramid, with the small square in the centre of the largei one , whilst the combination of the same two perspectives reversed in position gives the perception of a hollow or receding pyramid. To the-instrument by which this combination may be most conveniently ma ie, the name “Stereoscope’ (seeing solid) was given by its inventor, Mr. Wheatstone. Two forms of this instru- ment are in general use:—the reflecting stereoscope of Mr. Wheat- stone, aud tlie lenticular stereoscope of Sir David Brewster. As the respective claims of these two eminent men of science in regard to this invention have lately been again brought under discussion, the lecturer thought it right to place before his audience the real facts of the case. [The notes arid some parts of the text of what follows were omitted in the delivery of the lecture from want of time.] Thus, then, in the invention of the Stereoscope, three separate stages may he distinguished; and I am anxious to fix your atten- tion upon these, since your right estimation of the respective merits of the two principal claimants will depend upon your precise pciception of wlrat each has contributed to the general result:—](https://iiif.wellcomecollection.org/image/b21302364_0004.jp2/full/800%2C/0/default.jpg)
