Dark lantern or Magic lantern

a lantern with a single opening, which may be closed so as to conceal the light. [See Illust. of Bull's-eye.] — Magic lantern, an optical instrument consisting of a case inclosing a lamp, the light of which, passing through suitable lenses in a lateral tube, falls on a distant screen, exhibiting, greatly magnified, the image of objects, usually transparent colored figures, placed in the focus of the outer lens. [See Illust. of Magic Lantern.]