Inside are two light sources, which illuminate the object to be projected. Usually this object would be a postcard, photo, or other printed matter, but objects such as coins or leaves could also be projected. The light is reflected through the lens, and the image is projected onto a wall or screen. The light sources are burners. (http://museumvictoria.com.au/collections/items/721025/mirroscope-magic-lantern-projector-buckeye-stereopticon-co-1910) A lens sits at the front of a black metal box, with electricity lead. Inside two electric light bulbs illuminate the object to be projected (usually an image or printed matter), but objects such as coins or leaves could be projected. The light is reflected through the lens, and the image is projected onto a wall or screen. Focus is achieved by moving the telescoping lens tube in or out. The mirroscope includes an early electricity socket.projector, magic lantern, episcope, mirroscope, film, theatre, entertainment, movie