Fig. 219. cut in even one-inch strips. Of course the cloth or paper must be white. Cut off a strip of your gummed paper a little longer than the long edge of the triangle. With a pin at each end, pin it to the table, the gummed side up, and draw a line lengthwise through the middle, dividing it exactly in half. Have ready a glass of clear water and a paint brush, dip the brush in the water, and with it moisten one half of the paper. Over the wet half lay one of the
Fig. 220. triangles so that its long edge almost touches the central line, then gently press it until the paper holds fast to the card-board (Fig. 219). Remove the pins and turn the triangle over to make sure the paper is quite smooth on the right side; then lay it down again, moisten the other half of the gummed surface and
Fig. 221. press another triangle over that part, keeping the edges of the two triangles perfectly parallel, but not touching. The space between the edges must be left to give room for the bending of the corners (Fig. 220). Pin a second strip of
Fig. 222. paper to the table, moisten one half, and press still another triangle in place; continue doing this until all four sides of the pyramid are joined as in Fig. 221; then bring the last two edges together, while holding it in your hand, and press the moistened paper down, smoothing out any wrinkles that may appear. Lastly, trim off the ends of the paper at the bottom, and stand your pyramid up, holding it so that its base will form a perfect square (Fig. 222). Do not allow it to flatten and form a diamond. The top edges of the paper should be trimmed off as the sides are put together.
There are six parts to
Fig. 223.