STATIONARY ENGINES . 241 The cylinder for these engines is a plain casting , with steam and exhaust ports suited for the ordinary slide valve : one steam port at each end , and a central port for the exhaust . It is preferable to fit a cover at each end , more especially for large diameters , as… … Fig . 150 . — Colliery Winding Engines . Side Elevation and Ground Plan . cylinders free from Vibration , and the hole for the bottom bush in the stuffing box on a solid end is too small in diameter for an ordinary sized boring bar . There is a deep stuffing box on each cover , fitted with a gland…
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