. The railroad and engineering journal . , fig. 90, is attached inside of the smoke-box. At theother end it divides into two branches, G G, shown by dotted 272 THE RAILROAD AND [June, 1888. lines in fig. 178, each of which terminates in an opening, g^^,inside of the steam chest. The steam is thus delivered at bothends of the chest, and can pass freely into each of the steam-ports when they are open. By maliing the cylinders in thisway, they are e.\actly alike for each side of the engine, or, touse a shop phrase, there are \/io rights and lefts, so that acylinder_casting can be used for either
. The railroad and engineering journal . , fig. 90, is attached inside of the smoke-box. At theother end it divides into two branches, G G, shown by dotted 272 THE RAILROAD AND [June, 1888. lines in fig. 178, each of which terminates in an opening, g^^,inside of the steam chest. The steam is thus delivered at bothends of the chest, and can pass freely into each of the steam-ports when they are open. By maliing the cylinders in thisway, they are e.\actly alike for each side of the engine, or, touse a shop phrase, there are \/io rights and lefts, so that acylinder_casting can be used for either side of the engine. This H their surfaces in contact. The valve-stem v, fig. 177, workssteam-tight through a stuffing box, s, on the sleam-chest. Question 304. How are t/ie vahes ami pistons oiled ? Answer. The oil is usually introduced into the steam-chestthrough a pipe c, which is connected with a cock in the cabcalled the cylinder oil-cock or oiler. From this cock the oilfioivs through the pipe and down upon the valve and is conduct-. [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 pressur
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