The projecting lens is in the wrong place.
Athansius Kircher or the illustrator didn't quite know where to put the
projecting lens. Notice that the lens is between the oil lamp light source
and the object to be imaged on the screen. The imaging (projecting) lens
needs to between the object (the slide) and the screen, else you'll get
quite a blurry image of the slide. In fact the lens shown could image
the flame and smoke from the lamp.
Perhaps there is demon floating above the lamp, or
perhaps an antique dealer or collector.
For more about Magic lanterns and to see the original source of
visit Russel Naughton's wonderful site or see