The slides on this page are made up of pairs from the 'Catastrophes' series - they would be changed using the normal slide changer on a single lantern.
To today's television viewers, the animation seems very slow and insignificant. To the Victorian who had never seen projected pictures, the sense of expectation when wondering what would happen next must have been considerable.
We're familiar today with the technique of creating animations using slight changes, frame by frame, when projecting them rapidly produces movement on screen In the drawing process, a base drawing can be used, and then an element is changed for the next frame. In this instance again a base drawing is used and then the same base drawing with the necessary change is made for the second slide.