Hutton, Frederick Remsen, 1853- [from old catalog] · New York, J. Wiley & sons; [etc., etc.] · leaf 651
off the valve, and lightens the pressure at whichthe valve will open when the engine is at rest. By hangingthis second weight up so as to leave the rope or chain slackby which it is attached to the lever, the entire counterweightcomes on the lever, and full pressure is restored for regularrunning.… … Fig. 495. arranged so that the tension upon it could be varied by theengine-runner. It never became widely used outside of loco-motive practice. The fifth form is what is called the pop or reaction safety-valve, which is practically universal in locomotive practice,and is widely extended elsewhere.…
Mechanical engineering · Steam power plants
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