from The Century Dictionary and Cyclopedia

  • n. Any device or apparatus in which the pressure of steam is used to oppose and balance a weight or spring or other force.
  • n. A steam-accumulator in which steam, acting on a piston, balances a water-pressure upon a plunger or second piston acting in the opposite sense.
  • n. A steam-cylinder, in a vertical engine, with a piston to balance the weight of the piston-rod and connecting-rod, so that the up and down strokes may be of equal power.
  • n. A steam-cylinder with a piston to balance or reduce the pressure by which a slide-valve is held to its seat by the working pressure on its back.
  • n. The weighted lever of a boiler safety-valve which tends to hold the valve on its seat against the steam-pressure underneath it.


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