Fig. 9 gives an underneath view of the frame work and the place to put the cylinders in. They must be supported by two lugs, A A, screwed to the bed plate B, which must have a piece cut out on either side to allow the driving wheels C, to work in, as at D; because, being larger than the others, they project beyond the top of the bed plate, as shown in Fig. 2. Next screw on by means of the hook F, the buffer beam, previously cut from a piece of mahogany, 5 inches long, half an inch thick and one inch deep, nicely squared and sand papered. Drill a hole at G, and pass the shank of the hook through the beam and piece of brass in front of the frame, screwing up tight with nut H. For buffers you may take two brass, flat-headed screws, and attach them to the beam half an inch from either end, allowing half an inch projection. Now polish everything smooth and bright. Next warm the model over the gas--don't let it get hot--and carefully lacquer it with a small brush taking care not to go over any part more than once. The spokes of the wheels must be painted, the buffer beams varnished and the cylinders painted, leaving the covers and flanges bright. Now put away your work to dry, covering carefully from dust. HOW TO MAKE THE BOILER. In making the boiler you can't be too careful. This is the part where the greatest chance for failure comes in. Buy a piece of copper tubing 11 inches long, 3 inches wide and half an inch in diameter. If you want to make it yourself bend your copper round a wooden roller and rivet or solder together--riveting is the best if you can get it tight. You must then turn two circles of brass about an eighth of an inch thick for the ends and polish all. Fig 10 gives you the idea. Now push the ends into either end of the tube about an eighth of an inch from the edge, as at A, Fig. 11, and solder in place. The projecting flange must be hammered down all around as at B, soldered and finished with a half round file. When filing solder use only an old worn file as a good one soon fills up. SMOKESTACK, TUBES, ETC. Now drill a hole at A (Fig. 10) for the smokestack, which should be three-quarters of an inch in diameter. Then cut a slot in the bottom of the boiler 6 inches long by 1-1/2 inches wide, commencing one-quarter of an inch from the forward end of the boiler. [Illustration: Fig. 10.] [Illustration: Fig. 13.] [Illustration: Fig. 14.] [Illustration: Fig. 15.] [Illustration: Fig. 16.]