Hawkins, N. (Nehemiah), 1833- · New York : Theo. Audel · leaf 330
nsate for wear and the valves are cast hollow to reduce theirweight as much as possible consistent with good workmanship,also to serve as ports for steam admission. When these valveseats become worn they may be easily removed and rebored orreplaced by new ones, as desired. It will be observed…
Hydraulic machinery · Pumping machinery
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
