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.
Now cut three holes in the paper for the eyes and mouth, as seen in A; place the strip of card within this and mark the points for the eyes and root of tongue ; then slipping it out once more, the eyes can be carefully finished, and the tongue cut to fit in the mouth, and to extend some distance down on the chin, see Fig. B.
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