STATIONARY ENGINES.
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in each, and the valves are arranged nearly in a vertical position,hinging from the top; while the valves for the exit of the air are
o
Fig. 162.—Botfcom Chest for Blowing Cylinder.a, Passage for cylinder. b, Bottom chest.
placed quite flat on the cover, and are secured—as all these valvesare—with bolts and nuts, having a narrow strip of plate for the nutsto bear on at the hinge.
The top and bottom chests for taking awaythe air are formed of separate plates boltedtogether like a tank, and the joints rusted witha cement made of fine cast-iron borings, salammoniac, and sulphur. The proportions usedfor this cement are—sal ammoniac, 2 parts;flower of sulphur, 1 part; cast-iron borings,
200 parts. It requires some time to set, andmakes a first-rate joint. The top chest isbolted to the flange cast on the branch, andthe bottom one is let into the socket cast onthe base plate and then rusted up, and is fittedwith an inclined plate between the socket andthe bottom discharge chest—this plate havingfour openings for the non-return valves. Thetop and bottom chests are connected by meansof a circular column, securely bolted at the top Fig.163.—:o.stance Pipe forAir
, . J 1 Chests for Blowing Cylinder.
and properly jointed, no expansion joint beinsf — . T
required. The pipe for leading the air to thewrought-iron receiver is fitted to the bottom chest, the line ofpiping being circular.