ABSTRACT
The late Sir Charles Wheatstone’s beautiful invention, the stereoscope, gives the appearance of full relief or perfect solidity to photographs of objects seen by its aid, the photographs for the same must naturally be of limited dimensions. And though viewed through magnifying lenses, the images of the objects are presented to the eye on a scale far below the size of their originals. The defect is counterbalanced by several advantages which this form of stereoscope possesses. Firstly, the pictures can be enlarged to such an extent as to appear equal, or even larger than the original objects from which they were taken. And secondly, the eyes, in looking at the pictures, are not in any way subjected to strain by lenses, prisms, or reflectors, or by the difficulty which some persons experience in getting the two pictures to superpose.
