Optic projection : principles, installation and use of the magic lantern, projection microscope, reflecting lantern, moving picture machine, fully illustrated with plates and with over 400 text-figures (1914)

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CH. I] MAGIC LANTERN WITH DIRECT CURRENT 31 It should be a part of regular routine to look in the slide carrier at the close of'everv exhibition to make sure that the last lantern tr ^ ^ slide has-been removed. FIG. 14. SHIELD FOR THE OBJECTIVE IN INTERMITTENT PROJECTION WITH SLOWLIGHTING RADIANTS. Sl Shield raised to allow the light to pass from the objective to the screen. S Shield down in front of the objective to cut off the light from the screen. The shield should be of a concave form and in front of the objective a short distance to avoid heating. It should be made of metal or asbestos and be hinged so that it can be easily turned up or down. This is also the best time to arrange the slides in the box or a pile exactly as they were at the beginning of the exhibition ; then the set will be ready for use at the next lecture or demonstration. § 41. Lantern slides permanently fixed in individual carriers. — Originally lantern slides were mounted in wooden frames. Each slide then had its own carrier, which was inserted in a special opening for it next the condenser (fig. 15, 32). This method of mounting slides still prevails for some purposes. If one wishes to use them in the ordinary lantern the common slide-carrier (fig. 6) is removed entirely ; then each slide in its carrier is inserted in order during the exhibition. This method of mounting is admirable for a small collection of slides, as the wooden frame protects them, but for a large collection they take too much space and arc too expensive.