On this platform rear cards like the first pair, and continue till the whole pack is used; with care many of the under cards at the side can be removed to continue the structure.
Fig. 79.
XII.—INTERLUDES, PUZZLES, &c.
PUZZLES.
The best material for these geometrical puzzles is hard wood about an eighth of an inch thick; but pasteboard, cardboard, and stiff paper are efficient substitutes.
TO FORM A SQUARE.
To cut a card of the shape and in the proportions of Fig. 79, into three parts, to form a perfect square, you must cut through the lines of the obtuse angle, and it will then be an easy task.
