with guards to limit the lift . The valves for the entrance of the air are placed centrally round the stuffing box for the piston rod , that part of the cover being strongly ribbed in the casting ; and an annular chamber is cast round the circumference of the cover , which is fitted with valves of… … and as the whole of the ma - Fig . 191 . — Blowing Cylinder and Cover . chinery is built up on one frame , from end to end , the foundation is laid in brickwork , with about 2 feet of stonework on the top . This dass of engine is certainly the cheapest that can be supplied for heavy work ; and the…
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