Appleton's dictionary of machines, mechanics, engine-work, and engineering (1869)
New York, Appleton · leaf 801
and been in constant .ise ever since, it may be presumed that their general introduction in thedouble-acting steam-engine, where balanced valves are used, has been prevented or retarded by thedifficulties presented for their adaptation to that purpose. These difficulties might be of the… … die advantages gained by their superiority in principle may not be so counterbalanced by the difficultiesabove named, as to prevent their general introduction. To effect this, the valves are arranged on thelame level, as this is the arrangement most generally adopted in engines having balanced…
Mechanical engineering
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