[Illustration:  Phonograph Wax Record Case]

long and 3 in. wide on the outside bevel and are nailed to three blocks made hexagon, as shown in Fig. 2, from 7/8-in. material.  One block is placed at each end and one in the middle.  A 1/2-in. metal pin is driven in a hole bored in the center of each end block.  The bottoms of the pasteboard cases, used to hold the wax records, are either tacked or glued to this hexagon core, as shown in Fig. 3, with their open ends outward.

Two circular pieces are made of such a diameter as will cover the width of the core and the cases attached, and extend about 1/2 in. each side.  A 1/2-in. hole is bored in the center of these pieces to receive the pins placed in the ends of the core, Fig. 1.  These will form the ends of the cabinet, and when placed, one on each end of the core, heavy building paper or sheet metal is tacked around them for a covering, as shown in Fig. 4.  A small glass door is made, a little wider than one row of cases, and fitted in one side of the covering.  The outside may be painted or decorated in any way to suit the builder.

** Experiments with a Mirror [434]

Ask your friend if he can decipher the sign as illustrated in the sketch, Fig. 1, which you pretend to have read over the shop of an Armenian shoemaker.

He will probably tell you that he is not conversant with Oriental languages.  He will not believe it if you tell him it is written in good English, but place a frameless mirror perpendicularly on the mysterious script, right across the quotation marks, and it will appear as shown in Fig. 2.  We understand at once that the reflected image is the faithful copy of the written half.

With the aid of a few books arrange the mirror and the paper as shown in Fig. 3 and ask your friend to write anything he chooses, with the condition that he shall see his hand and read the script in the mirror only.  The writer will probably go no farther than the first letter.  His hand seems to be struck with paralysis and unable to write anything but zigzags, says Scientific American.

Another experiment may be made by taking an egg shell and trimming it with the scissors so as to reduce it to a half shell.  In the hollow bottom roughly draw with your pencil a cross with pointed ends.  Bore a hole, about the size or a pea, in the center of the cross.  Place yourself so as to face a window, the light falling upon your face, not upon the mirror which you hold in one hand.  Close one eye.  Place the shell between the other eye and the mirror, at a distance of 2 or 3 in. from either, the concavity facing the mirror as shown in Fig. 4.  Through the hole in the shell look at the mirror as if it were some distant object.  While you are so doing the concave shell will suddenly assume a strongly convex appearance.  To destroy the illusion it becomes necessary either to open both eyes or to withdraw the shell away from the mirror.  The nearer the shell to the mirror and the farther the eye from the shell the more readily comes the illusion.