8. Sand-paper.—Coarse and fine (halfpenny per sheet).
9. Copper wire.—Such as is used for bell-hanging. Cost, one penny, sufficient for several.
10. Crystal varnish.—Cost, twopence.
11. Brass or steel chain.—A piece of a toy watch-chain does very well.
12. A few small pieces of coal from the coal-cellar, when required.
13. A knife, with sharp edge.—Boys need no advice on this point.
14. A cutting-board.—Any smooth piece of board about half an inch thick.
15. Cotton.—One reel of strong, any colour.
16. A few pieces of board for painting and drying gummed parts on. Such as described in No. 1 will do.
When all your materials are ready, select a piece of thin wood (marked 1 in the [list] of materials). Let it be free from knots and straight in the grain. The following dimensions are suitable for a medium-sized model; if larger or smaller models are desired, increase or decrease proportionately.