After inserting a nickel, approximately 15 intriguing slides are able to be viewed. The cog found on the right side of this mahogany housed device allows the movement of the pictures. Average sized translucent circular glass noticed on both sides, allowing light through for better viewing. Manufactured in 1922 by the Exhibit Supply Company. The slides do not switch fully with every press of the cog. There is minor wear throughout but overall a great piece! Condition: (Good - Very Good). Dimensions: 20-1/2"T x 12"W x 13-1/2"D.