To solder handle A to B (Fig. 514). Thoroughly clean that part of B to which A is to be fastened, and handle A, rubbing the edges of A with emery-cloth. Place A on B and rub a little flux with a brush along the join. Dip the bit into the flux and drop a spot or two of solder on the edges by applying the heated iron to the end of the strip of solder. Apply the bit to the solder and trail the solder with the point of the hot iron round the join so that it is filled up.
A little practice will soon enable this to be done successfully, and the skill thus acquired makes the following toy possible.
A Steamer with a Screw Propeller. Fig. 515 shows the size and shape of the steamer. It should be about 4 inches wide amidships, 3½ inches deep, and hollowed out as thin as possible, according to directions given in Chapter XIV. Fig. 516 shows the measurements for the stern. The bows should be sharp.
This boat must be fairly large to take the tube which runs through it. Fasten a strip of lead 1/8 inch thick to the bottom of the keel. Paint the boat a suitable colour. When it is dry place it in the water and mark on the stern-post, A B (Fig. 516), the height to which the water comes, for the propeller must come just below this. Midway between this point and the end of the keel bore a hole, C, in the stern-post, through the boat in the direction of the top of the bow. This hole should be 3/8 inch wide and can be made with a red-hot wire.
A brass tube must now be bought from a gasfitter's, 3/8 inch
Fig. 515
Fig. 516