The Practical mechanic's journal . e steam, when stretched across the annular space of the cylinder, it islet into a groove in the centre partition, and end set-up plates, thus pro-viding it with a solid foundation. The adoption of the system of dividedsteam-ways in the slide, removes all objectionable frictional wear at thatpart, as it is only for a quarter of an inch movement in each stroke thatthe steam pressure upon the valve is unbalanced. The instant the com-munication is opened on both sides of the stop, the pressure is equipoised,and the remainder of the valves stroke is performed unde
The Practical mechanic's journal . e steam, when stretched across the annular space of the cylinder, it islet into a groove in the centre partition, and end set-up plates, thus pro-viding it with a solid foundation. The adoption of the system of dividedsteam-ways in the slide, removes all objectionable frictional wear at thatpart, as it is only for a quarter of an inch movement in each stroke thatthe steam pressure upon the valve is unbalanced. The instant the com-munication is opened on both sides of the stop, the pressure is equipoised,and the remainder of the valves stroke is performed under a pressure nogreater than that resulting from the mere weight of the metal. At eachrevolution, a portion of the steam contained between the after curvedside of the projection and the cylinder, which steam has before done itsduty in carrying round the piston, is shut in by the steam-stop, to beagain made use of in the succeeding stroke, or revolution. One of themany valuable details of the engine is the metallic ring packing, em-. 270 THE PRACTICAL MECHANICS JOURNAL. pH _^ tei
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