. Model engine construction, with practical instructions to artificers and amateurs. Fig. 18. week or two near the fire to harden. When this iscomplete, the gauge will be found perfectly steam-tight, will remain so, and can be attached to theboiler by soldering the plate all round the edges,having previously drilled two holes in the shell,through each of which one of the brass tubes passeswhen the gauge is fixed on to the boiler. Gauge-cocks (see Fig. 18). These are fitted tothe boiler to ascertain the height of the water F 66 MODEL ENGINE CONSTRUCTION. inside, and are used instead of a gauge-
. Model engine construction, with practical instructions to artificers and amateurs. Fig. 18. week or two near the fire to harden. When this iscomplete, the gauge will be found perfectly steam-tight, will remain so, and can be attached to theboiler by soldering the plate all round the edges,having previously drilled two holes in the shell,through each of which one of the brass tubes passeswhen the gauge is fixed on to the boiler. Gauge-cocks (see Fig. 18). These are fitted tothe boiler to ascertain the height of the water F 66 MODEL ENGINE CONSTRUCTION. inside, and are used instead of a gauge-glass, or inorder to check it. For models, two are sufficient;they are to be inserted so that steam should issuefrom the boiler on opening the upper cock, andwater upon opening the lower one. These articles. Fig. 19. are best purchased ready-made, as they are difficultto construct, and can be had from rV bore upto \ and larger sizes. The blow-off cock is the same as the above, butlarger, and is inserted through the shell oj)positeto the lowest part of the internal fire-box, and isused to blow off mud, scale, etc., from the boiler. THE BOILERS AND THEIR FITTINGS. 67 Mud-plugs are not required for small models. The whistle (see Fig. 19) is made out of a brasscasting. It consists of a bell-top with a cup-shapedchamber underneath, supported on a hollow stem,containing a cock, which can be screwed into theboiler. The bell-top is screwed on to a small centralspindle, which projects upwards, being supportedon a disc which has a narrow neck or groove, ofa circular shape, cut underneath it. The central holethrough the stem must be drilled up to the neck,but no further; then four small holes are to bedrilled in a radiating direction from the grooveinwards to the central hole. A brass ring is puton,
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectmachinery, bookyear18
