Sand for Motor. If you can get beach sand for the hopper, get it. If you cannot, take coarser sand (builder's

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Fig. 350. - Sand-Motor Wheel Fig. 351. - End Piece of Wheel Fig.352. - Paddle Fig.353. - How End, Paddle and Spool Hub are Assembled torpedo sand, or any kind you can get) and screen out the finer particles through a piece of screen wire. Sand too coarse to go through screen-wire will clog the hopper outlet. If the sand is damp, it must be dried out to prevent caking. The Toy Trip-Hammer. Uprights M at the end of the base opposite to that on which the sand-motor is mounted

(Figs. 347 and 354), support shafting and pulleys operated by belts from the paddle-wheel. One of the shafts operates

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FIG. 354. - Cross-Section Looking Toward Framework Supporting Toy Trip-Hammer

Figs. 355 and 356. - Details of Spool Pulleys, and Trip-Hammer the trip-hammer. The trip-hammer consists of a piece of pencil or dowel-stick (N, Figs. 347, 354 and 356), which slides up and down through a pair of screw-eyes screwed into one of the uprights M. A screw-eye in the top of the trip-hammer stick provides a point of attachment for the hoisting-cable; a round-headed tack in the lower end forms the hammer head, and a second round-headed tack driven into the base serves as an anvil.

The hoisting-cable attached to the top of rod N must run up to and be tied around a beam (0) fastened across the tops of supports M (Fig. 354). This cable must be tripped by means of a tripper finger (P), a piece of tin folded in half and inserted in a slot cut in the side of a spool (Q, Fig. 355). Fasten this spool and another spool (R) upon a shaft (S), and mount this shaft upon screw-eye bearings screwed into

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Figs. 357 and 358. - Details of Toy Grindstone, Belt and Pulley the outer face of uprights M in the positions shown. Once during every revolution of the shaft, tripper finger P will strike the hoisting-cable and raise the hammer as shown in Fig. 347, releasing it in passing, and letting the hammer drop upon the anvil. Run a string belt from spool pulley R over to one of the spool pulleys G on the paddle-wheel (Fig. 348).

The Toy Grindstone. Spool pulley T on the lower shaft V (Fig. 354) is belted to the second spool pulley G on the paddle-wheel, and spool-pulley U on shaft V is belted to

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Fig. 359. - Detail of Standard for Teeter Toy Shown in Fig. 346 Fig. 360. - Detail of Sand-Hopper Fig. 361. - Detail of Teeter a toy grind-stone built as shown in Figs. 357 and 358, with a base block W, uprights X, stone Y, and spool pulley Z. Mount the wheels in the same way that the other wheels are mounted.

The Teeter Toy. This sand toy, shown in Fig. 346, is built with a sand-motor of its own.

The Standard supporting the teeter is shown in detail in Fig. 359. Cut uprights A of the size shown in Fig. 362, base B of the size shown in Fig. 363. Fasten the uprights to the base 3 inches apart.

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Fig. 362. - Pattern of Standard Upright Fig. 363. - Pattern of Base Fig. 364. - Pattern of Hopper Sides Fig. 365. - Pattern of Teeter

Fig. 366. - Pattern of Teeter Sand-Pocket

The Hopper is made of four pieces (D and E, Fig. 360). Cut a square piece of 1/2-inch board of the size shown in Fig. 364, and saw it in half from corner to corner, for side pieces D; cut end pieces E 2 inches wide by the length of the short edges of the side pieces. Lap the end pieces, and nail together, then nail sides D to their side edges. Bore a hole through the center of the hopper bottom (Fig. 360) for a sand outlet, then fasten the hopper between supports A, so the bottom is 3 inches below the top of the supports.

The Teeter must be light in weight, and must be delicately balanced, so it will respond quickly to the overbalancing action of sand dropping into the pockets at the center. In making his first model, the author used a thin stick for the teeter plank, but found that it was too heavy. In the model shown in Fig. 346, a strip of card-board folded in three was used (F, Fig. 361), and the weight of this is just right. Cut the strip of cardboard of the size shown in Fig. 365, score it from end to end, 3/16 inch from each edge, as indicated by dotted lines in the pattern, and bend over the edges. By bending the strip in this way, it will be stiffened sufficiently to carry the weight of the sand dropping upon it at the center, and the weight of the cardboard dolls on the ends. The

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Fig. 367. - Boy for Teeter Fig. 368. - Pattern of Boy's Body Fig. 369. - Pattern of Boy's Leg Fig. 370. - Pattern of Girl's Body Fig. 371. - Pattern of Girl's Leg center sand-pockets are formed with the piece of cardboard G (Fig. 361), cut of the shape and size shown in Fig. 366, and the separator block H, which is 1/4 inch thick, 1 inch wide, and 2 1/2 inches long. Tack the folded piece of card-board G to the sides of block H, and glue the teeter-board strip F, at its center, to the under side of the pockets.

The teeter must be fastened between the supports so there will be 1/2 inch space between the top of block H and the outlet in the hopper, and so the outlet will be exactly over the center of the top of block H. Use nails for pivots, and drill holes through uprights A a trifle larger than the nails, so the nails will turn easily Use halves of spools for washers (I, Fig. 361), to fill the space between the sides of the sand-pockets and the uprights.

Strips C (Fig. 359) are nailed to the side edges of uprights A to act as bumpers. Their purpose is to prevent the teeter from tilting too far. In the model shown in the photograph, the strips are placed 1 3/4 inches below the level of the nail pivots. Adjust the strips on your model so as to have the teeter tilt to whatever angle you want it to go.

How the Teeter Toy Works. When the sand-hopper is filled with sand free from pebbles and dirt that would clog the outlet, the teeter is set in motion. The sand pours into whichever sand pocket is tilted uppermost, until the weight is sufficient to cause an overbalance, then the end of the

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Fig. 372. - Tin Can Sand Scoop teeter board on that side of the center drops until the bumper C is struck. As soon as the teeter tilts in this direction, the sand empties out of the pocket, and the sand from the hopper pours into the other pocket, now uppermost, until the weight again overbalances, and the teeter inclines in the other direction. Once begun, the teetering movement continues as long as sand remains in the hopper.

The teeter toy requires a couple of

Doll Teeterers. In Fig. 367 you will see how to make a boy doll. The pattern of the body in Fig. 368, and pattern of the legs in Fig. 369, are shown full-size. Make a tracing of each pattern, and transfer the tracing upon light-weight cardboard or heavy note-paper. Glue the legs to the sides of the body as shown in Fig. 367. Figure 370 shows a pattern for the body of the girl doll, and Fig. 371 a pattern for the legs. Glue only the tip ends of the legs to the body. Slot each end of the teeter, slip the end of the doll body into the slot, and bend out the legs to straddle the teeter, as shown in Fig. 346.

A Sand Scoop for throwing used sand back into the hopper, can be made by cutting away part of the side of a tin can, and nailing the can bottom to the end of a stick handle, as the scoop shown in Fig. 372 is made.