1950s vintage, Interphoto "Power Station" light-up viewer and control for your 35mm slide projector. This photo slide viewer has a light-up glass window for viewing your slides before loading them into the projector, two electrical sockets for your slide projector and one for your "house lights". There is a selector switch to allow you to control the lights and the projector from your seat, rather then have to get up and turn the lights off and on while running your slide show.
This control would probably also work well for a movie projector with your 8 mm & 16mm movie film.
It has an industrial "hammered" paint finish and works well. The lamp in the light-up viewer lights and the switch controls the power to the sockets. This is in nice vintage condition with a little peeling to the label.