stereo plasmic (ster"eoplazmik)

[ sight: see optic.] An improved form of magic lantern, consisting e entially of two complete lanterns matched and connected. The object of the reduplication is to permit the pictures shown to pa from one to the next by a sort of di olving effect which is secured by alternate use of the two lenses, and at the same time to avoid the delay or the unpleasant sliding of the pictures acro the field in view of the audience, but imperfectly avoidable when the simple magic lantern is used. The two lanterns may be either superposed or IMG:content-2099.png:[merged small][merged small][merged small][ocr errors][merged small][merged small][merged small] the diagram beneath. The light-rays from corresponding points of the two pictures P and P' are refracted in pa ing through the lenses L, L', and their directions changed so that they now seem to the eyes E, E' to diverge from a common point A beyond the plane of the card. By special effort a skilled observer can combine stereoscopic pictures into one without the use of the instrument, each eye being directed to one picture only and (to produce the normal stereoscopic effect) the one on its own side; the proce may be facilitated by interposing a card screen between the pictures so that, for example, the left picture is entirely cut off from the right etc. If the eyes are cro ed so that the right eye sees the left picture and the left eye the right only, and the images combined by special effort, the usual stereoscopic effect is reversed a convex surface becomes concave, etc. A similar pseudoscopic result is obtained with the ordinary stereoscope if the positions of the two pictures are exchanged. stereoscopic (ster"ē-o-skop'ik), a. [=F. stéréo scopique; as stereoscope + -ic.] Of, pertaining to, or resembling the stereoscope; adapted to the stereoscope; having the form in relief, or proper perspective, as of an object seen in the stereoscope: as, stereoscopic pictures; ster coscopic views. - Stereoscopic camera, diagrams, projection. See the nouns. stereoscopical (ster"ē-o-skop'i-kal), a. [ oscopic + -al.] Same as stereoscopic. stereoscopically (ster-o-skop'i-kal-i), adv. By or as by a stereoscope.