The Civil engineer and architect's journal, scientific and railway gazette (1839)
London : [William Laxton] · leaf 201
ruction of piston;secondly, in certain alterations in the chimney and blast-pipe;and thirdly, in certain arrrangements and alterations of the educ-tion-passages and valves, for the purpose of diminishing the back])ressure, or the resistance of the steam in the eduction-passagesto the motion of the… … Fig. 1. The improved piston is shown in cross section at fig 1. Thenovelty consists in the adoption of one or two packing-rings a, a,which are of a form to allow of a projection towards the interiorof the piston, having the surface conical at b, h; on which conicalsurfaces two inner rings c, c, are…
Architecture · Civil engineering · Science
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