Terpuoscope magic lantern. Optical lantern with mechanical slide changing mechanism. Rackwork carries unmounted slides from below the lens mounting into the focal plane ejecting previous slide from the top. Provision for mounted slides or ordinary slide carrier. 6 inch projection lens fitted with rack and pinion focusing. No light spurce. Storage space below lamp chamber for slides, chimney is missing etc. J. Wrench and co c.1890.