Twenty Years With the Indicator Being a Practical Textbook for the Engineer Or
Twenty Years With the Indicator Being a Practical Textbook for the Engineer Or
Thomas Pray
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" Sometimes at very high speeds, or with very sudden action of the steam, the spring of the indicator is put into vibration. If the line produced by these vibrations is a waving line, quite free from angles, this is an evidence that the action of the instrument is frictionless, and the mean of the vibra- tion gives a true line. " Almost on the same page Mr. Porter makes this state- ment : " There are no vibrations or pulsations of steam in the cylinder ; all appearances of this kind, on the exp...ansion curve, are caused by the spring of the indicator being put into vibration by the sudden action of the steam. " If the vibrations do not occur while the engine is under motion, or if the pulsations are not caused by the conflict in the molecules of steam, or steam and water, as well as the different mechanical forces, then we confess that our steam engine indicator had better be laid upon the shelf instantly, there to remain until we can prove that different mechanical forces, acting as we have cited above, are capable of producing a true hyperbola by means of a spiral spring.
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