. The railroad and engineering journal . [I method of making cylinders has been adopted by nearly all theprincipal builders in this country. Question 302. How is the steam-chest constructed? Ayzswer. It usually consists of two castings, one of which,J J< figs. 177, 17S, 179, and 180, is a square cast-iron box madeopen at the top and bottom. This rests on the top of the cyl-inder casting and is joined to the latter with a steam-tight top of it is a cast-iron cover, K. The steam-chest and ed by suitable holes and channels to the valve-face and from therethrough the steam-ports to the
. The railroad and engineering journal . [I method of making cylinders has been adopted by nearly all theprincipal builders in this country. Question 302. How is the steam-chest constructed? Ayzswer. It usually consists of two castings, one of which,J J< figs. 177, 17S, 179, and 180, is a square cast-iron box madeopen at the top and bottom. This rests on the top of the cyl-inder casting and is joined to the latter with a steam-tight top of it is a cast-iron cover, K. The steam-chest and ed by suitable holes and channels to the valve-face and from therethrough the steam-ports to the cylinder and piston. Sometimes the valves are oiled by pouring oil or melted tallowinto the oil-cocks when the steam is shut off from the steam-chestsand cylinders. When the pistons are working in the cylinderswithout steam, they create a partial vacuum, so that if oil is thenpoured into the oil-cocks it will be sucked into the steam-chests,or, in other words, it will be forced in by the pressure of the air. cover are held down by bolts,//, which are screwed into thecylinder casting and have nuts on top. Question 303. How are the slide-valves maie to work steam-tight on the valve-seats ? Answer. They are first planed off smooth, and then filedand scraped until the two touch each other over the whole of Fig. 180. above it. A shelf 105, fig. 165, is attached to the boiler to re-ceive an oil-can filled with oil or tallow, which is thus meltedor kept in a fluid condition by the heat of the boiler. Question 304. How are the cylinders and steam-chests pro-tected so as to prevent, as far as possible, the heat in the steam frombeing lost? Vol. No. 6.] ENGINEERING JOURNAL. 273 Answer. The sides of the cylinders are covered with wood) WW w, fig. iSo, called the cylinder lagging, and the wood iscovered outside with Russia iron, which is called the cylinder-casing. The ends of llie cylinders have light metal covers,called cylinder-fiend coiers, shown in section at a a, fig. 177,mad
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