Magic lantern single lever slide: wizard casting a spell

Magic lantern single lever slide showing a wizard casting a spell over a cauldron.

Lever slides give movement to the subject by the use of two pieces of glass, one fixed in the wooden frame and the other mounted into a brass frame which can be partially turned in front of the other (background) glass by moving a lever. The lever is restricted in its movement by being confined in a channel cut into the surface of the wooden frame. They are typically used for subjects where a partial rotation produces an effect of movement, such as a child riding a pig or a ship rolling on the sea.