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.
Fig. 10.
| Fig. 13. | Fig. 14. |
| Fig. 15. | Fig. 16. |