This mahogany and brass Bi unial/double lens magic lantern is model Super B, manufactured by Riley Brothers of Bradford, Yorkshire, UK. It projected 3 1/4" X 3 1/4" glass slides. Essentially it was two slide projectors on top of each another. it could be used to present sophisticated magic lantern shows. Images could be superimposed on each other, and views could be transformed from day to night by means of opening one lens and closing another. The optics are in good condition with no cracks or clouding. The condensors are both present with no cracks or chips. Illumination provided by electric mogul base lamps. It was probably converted from kerosene lamp illumination. The focus racks work but will need cleaning and lubrication. The top lens barrel moves in and out smoothly but the bottom one is tight and will need cleaning. It is in overall beautiful condition. and is on its original base. It has been sitting in a collection untouched for over 50 years and will need a good cleaning. It measures 21 1/2"H X 22"W X 10 1/4"D. It is missing the slide carriers. The electrical wiring inside has come detached from the top socket. It has its original British plug. The base that holds the top light socket has broken loose.