inch board twelve inches long by two and one-quarter inches wide, and, after rounding the ends as shown in the drawing, cut a mortise at A and B two and three-eighths inches from either end. Procure two one and one-half inch spools for wheels, and drive a wooden peg through the hole in each, cutting off the ends so they project a little beyond the hole, as shown in Fig. So. Then bore four holes in the edges of the truck-bed with a gimlet at C, D, E, and F (see drawing), and, after setting the spools in mortises A and B, pivot them in place with small finishing nails driven into the wooden pegs. These nails should fit loosely in the gimlet holes. In order to drive them into the exact centers of the spools, it is best to locate these points upon the ends of
Fig. 80.—Spool Wheels.
Fig. 81.—The Completed Car Truck.
the pegs before placing the spools in the frame. A quarter-inch hole should be bored in the top of the truck-bed at G and H (Fig. 79) in which to fasten the two uprights I and J (see Fig. 81). Make the uprights four inches long and
