. Optical projection : a treatise on the use of the lantern in exhibition and scientific demonstration. Fio. 83.—Duboscq Lautcru APPARA TUS FOR SCIENTIFIC DEMONSTRA TION 157 Two detached lanterns have some obvious advantages,where detached or side experiments are of frequent in perhaps the majority of cases the demonstrator, equallywith the exhibitor, may find it most advantageous to employa bi-uuial or even tri-unial arrangement, modified, however,. Pio. fH&.—A Microscopic Bfomial according to his special purposes. This is especially the planwhere the lime-light is the radiant
. Optical projection : a treatise on the use of the lantern in exhibition and scientific demonstration. Fio. 83.—Duboscq Lautcru APPARA TUS FOR SCIENTIFIC DEMONSTRA TION 157 Two detached lanterns have some obvious advantages,where detached or side experiments are of frequent in perhaps the majority of cases the demonstrator, equallywith the exhibitor, may find it most advantageous to employa bi-uuial or even tri-unial arrangement, modified, however,. Pio. fH&.—A Microscopic Bfomial according to his special purposes. This is especially the planwhere the lime-light is the radiant employed. The simplestcase is perhaps that of a medical school, which may desire tosupplement the demonstrations of such a lantern microscopeas is described in the following chapter, by photo-micrographs 158 OPTICAL PROJECTION and other diagrams. A suitable bi-unial, the simplest modi-fication of the ordinary form, is that in fig. 84, and will per-fectly suffice for such purposes, where physical experimentsare not required, My own bi-unial lantern, being required for experiment,as well as exhibiting slides and microscopic projections, wasdesigned differently. The bottom is supported on four brasspillars, each 4 inches high, which allow gas-pipes for colouredflames, or any other apparatus, to be readily introduced frombelow, while a black curtain round these pillars, and anotherround the back of the lantern, stop all stray light when re-quired, the dar
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