Fig. 30.
Fig. 31.
First cut a piece nineteen inches long by sixteen wide, and bend it round, forming a cylinder five inches in diameter; the lap must be closely riveted, and then the two ends hammered out into a flange outwards, leaving the body of boiler seventeen inches long, as in [Fig. 30]; B is the shape of piece to be next riveted on at after end, then take another sheet nine inches wide, and hammer a half-inch flange round it so as to fit over the dotted line in A.
Then rivet them firmly together, and also another piece in after end.
It will now have the appearance of [Fig. 31], and should be four and a half inches deep from A to B, and forming a copper box six inches wide from B to C, and eight inches from C to D.
Then rivet together another box to form the inner casing four and a half inches wide by six and a half inches long and nine inches deep.
Fig. 32.
The bottom of this must be hammered outwards to the dimensions of BC CD, as shown in section [Fig. 32] at AA. A hole is next to be cut out in the centre of rear plate, and also the rear part of inner casing which comes opposite to it, and one three-quarter inches by two and a half, forming an elliptical opening for the furnace door.