London : Longman, Rees, Orme, Brown, Green, and Longman · leaf 228
red by bolting : a a is the movable part of the valve, orinner cylinder, having its two seats (b b and c c) faced with brass.These are fitted staunch to the corresponding seats of the valve-case, by turning and boring, and subsequent grinding, s is thewrought-iron valve-stalk, communicating with… … takes the course indicated by the arrows; passing downwardsthroufrh the internal cylinder, upwards through the hollow neckof the lower seat, and laterally through the flange Jc A-, andwhatever it may be secured to. In the plan exhibited in Jigs.S6. and 37., valves thus circumstanced are shown…
Architecture
Internet Archive · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten02unit-26-7.webp)
