The sciopticon manual, explaining lantern projection in general, and the sciopticon apparatus in paricular (1877)

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52 SCIOPTICON MANUAL. The new Woodbury slides are exactly quarter plate size (3i x 4£), which gives room at the sides for naming and for handling, and which in turn gives assurance of their being inserted in proper position. Fortunately each half of a stereoscopic view is 3 inches square, so that lantern slides, of standard size, can be printed by contact from stereoscopic negatives. Although the demand for lantern slides has never warranted ex- tensive travel for desirable negatives, yet the stereoscope has sent photographers "viewing" high and low, and everywhere; on the Alps, in the Yosemite, in the valley of the Nile, on open Polar Seas, and often (as intimated by one of their own number) into distressingly narrow straits. Glass transparencies made for the stereoscope, when cut in two, with clear glass covers instead of ground- glass, are extensively used for lantern slides. Many of these, especially of the imported views, are very fine, and leave nothing to be desired when used in the Sciop- ticon. But as a heavy deposit of silver is not particu- larly objectionable in the stereoscope, many of these pictures can only be satisfactorily shown upon the screen, with an intense chemical light, if with that even. When the demand for these fine views for the lantern is suffi- cient to turn the attention of photographers to their production, we may look for more good pictures, and we hope at a cheaper rate. THE SEALED PICTURE. A drop of Canada balsam between two disks of plate- glass, on one of which is a beautifully colored photo- graph, is skilfully managed so as to allow the plates to come almost in contact, with a film of the balsam filling all the space between j this makes the picture beautifully