MOVABLE TRANSPARENCIES.
Mount the transparency on a light circular frame, on an axis easily turned. Close the upper end of the hollow cylinder with a disc of tin, cut into inclined planes like the ventilator let into window panes (fanlight).
A lamp placed inside the cylinder will illuminate the transparency at the same time that it makes it turn round by the current of heated air striking the tin plate.
Vary the subject of the pictures as you please. Mr. Panky’s represent hideous serpents twisting round a column, and other delicious spectacles.
Fig. 56.
To make the above magical figure without taking the hand off, begin at A, thence to B, to C, to D, to E, and so on.