Take a card one-and-one-half inches wide, and fold around it a piece of unruled note paper, so that the card can easily slide up and down; then paste this case on the under side.
Then by putting the two pieces together, pulling the tongue in its place through the opening, very amusing expressions can be produced, by simply moving the pasteboard up
and down in the paper.
Fig. C represents the two parts put together.
Excerpt from: How? or, Spare hours made profitable for boys and girls by Holbrook, Kennedy