STEREOSCOPE

an optical instrument for viewing photozrapha so as to give the appearance of solidity to the resulting picture. Two photographs are taken instead of one. from Pa distant from one another as far as the centre of one eye is from that of the other. The photographs are then so arranged on a card behind a couple of lenxca that each eye sees exactly the picture it would bave seen from the original onion of the lenses. It was Profe or Wheat at one who Grat — = po ibility of making stereo scop tures. [s. 289]