Figure 22 suggests How To Cut Up a Picture Puzzle. You can draw out the cuts upon the mounted picture, or you can decide upon the shapes of the cuts as you work, if you wish. The saw teeth will leave a rough edge to the cuts, on one side of the block, you will find. To prevent the roughness, which would spoil the picture upon that side, back the block with another thin piece of wood, and hold the two pieces firmly together while you cut. While making puzzles, let us make a model of The T-Puzzle, a famous old puzzle that is more difficult to assemble than it looks. Figure 23 shows it put together. The key to the solution lles in properly placing the irregular-shaped block at the intersection of the vertical and horizontal members of the ietter. Once you get the position of this, the other pieces are easily assembled.

Full-Size Patterns of the four blocks are given in Fig 24.

Fig. 23. - The T-Puzzle

Fig. 24. - Full-Size Patterns for the T-Puzzle Blocks

Make a careful tracing of them upon thin paper, and transfer the tracings upon a strip of wood. Cut out the pieces care-

Fig. 25. - The Square Puzzle

Fig. 26. - Full-Size Patterns for the Square-Puzzle Blocks fully, and smooth the edges with sandpaper, then fit them together, and trim up all ends and edges that require it. The Square Puzzle, shown correctly assembled in Fig. 25, is another interesting puzzle to make. It requires nine blocks. Figure 26 shows

Fig. 27. - Cut the Square Puzzle Blocks out of a Strip like this

The Patterns. If you will trace off the patterns as shown in Fig. 27, with the blocks placed end to end, you can prepare a strip of the right width to take in the blocks and then saw it up. These blocks must be carefully finished so they will be of exactly the right size, or they will not fit together nicely to make the square.

The Prism Puzzle presents one of the most interesting of the simpler scroll-saw problems.

It is easy to make.

The first thing to do is to prepare a stick 1 1/2i inches square.

The length of the finished block will be 4 3/8 inches, but do not cut the block to this length until after the rest of the cutting has been done (Fig. 28). If you do separate it, there will be no way of keeping the parts Fig, 28. - The Prism Puzzle together while cutting, and there will be nothing to hold the block by. Plane the sides of the stick square and smooth, and square off one end. Mark off the distance of 4 3/8 inches from the squared end, upon each side of the block. Then draw the curves shown in Fig. 29 upon two adjacent sides of the block, making a tracing of the pattern and transferring it to the block.

In cutting, it will be best to support the block in a vertical position, and cut down as shown in Fig. 30. There are two important things to do. Hold the saw so that the blade will cut horizontally and always parallel to the sides of the block, and cut exactly upon the lines.

Figure 31 shows the nine blocks into which the block is separated in the process of cutting. The center piece is the only piece that is irregularly shaped on all four sides; therefore, this is the piece to begin with in assembling the block. Find two pieces that will fit upon opposite sides of it, and fit the three pieces together, Then find three

Fig. 29. - Full-Size Pattern for Cutting Prism Puzzle Blocks pieces that will fit together each side of the center three pieces, slip them into position, and the block will be put together. There is a trick to locking the pieces one inside another, even when the correct positions have been discovered You must get the knack of putting them together through experimenting.

A Seven-Piece Set of Doll Furniture. You would hardly imagine that out of the little block of wood shown in Fig. 32, a seven-piece set of doll-furniture can be cut by making six saw cuts, yet this is the way the doll furniture shown in Figs. 37 to 43 was prepared. Stand the pieces of furniture upon a table, and ask a friend to fit them together so as to form a symmetrical block, and the friend will think that you are joking. By comparing the letters on the pieces of furniture, with the letters on the block shown in Fig. 32, you will see how the pieces fit within one another.