The Stereoscope, a word derived from orient, solid, and (jrx nv, to see, is an optical instrument, of modern invention, for representing, in apparent relief and solidity, all natural objects and all groups or combinations of objects, by uniting into one image two plane representations of these objects or groups as seen by each eye separately. In its most general form theS tereoscope is a binocular instrument, that is, is applied to both eyes; but in two of its forms it is monoctdar, or applied only to one eye, though the use of the other eye, without any instrumental aid, is necessary in the combination of the two plane pictures, or of one plane picture and its reflected image. The Stereoscope, therefore, cannot, like the telescope and microscope, be used by persons who have lost the use of one eye, and its remarkable effects cannot be properly appreciated by those whose eyes are not equally good.
(Typographical errors above are due to OCR software and don’t occur in the book.)

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