File:Applied thermodynamics for engineers (1913) (14766379665).jpg

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Identifier: appliedthermodyn01enni (find matches)
Title: Applied thermodynamics for engineers
Year: 1913 (1910s)
Authors: Ennis, William Duane, 1877-
Subjects: Thermodynamics
Publisher: New York, Van Nostrand
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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Fig. 218. Arts. 484, 486. —Goodand Bad Indicator Diagrams. 334 APPLIED THERMODYNAMICS cessive gas engine diagrams. Outside-spring indicators are a recent type, inwhich the spring is kept away from the hot steam. The Ripper mean-pressureindicator (29) is a device which shows continuously the mean effective pressurein the cylinder. Instruments are often provided with pneumatic or electricaloperating mechanisms, permitting one observer to take exactly simultaneous dia-grams from two or more cylinders. Indicators for ammonia compressors musthave all internal parts of steel; special forms are also constructed for heavy hy-
Text Appearing After Image:
FiG. 219. Art. 484. —Crosby Steam Engine Indicator. draulic and ordnance pressure measurements. For very high speeds, in which theinertia of the moving parts would distort the diagram, optical indicators are iised.These comprise a small mirror which is moved about one axis by the pressure andabout another by the piston movement. The path of the beam of light is pre-served by photographing it. Indicator practice constitutes an art in itself; forthe detailed study of the subject, with the influence of drum reducing motions,methods of calibration, adjustment, piping, etc., reference should be made to suchworks as those of Carpenter (30) or Low (31). In general, the height of the dia-gram is made of a convenient dimension by varying the spring to suit the maxi-mum pressure ; and accuracy depends upon a just proportion between (a) themovements of the drum and the engine piston and (b) the movement of the indi-cator piston and the fluctuations in steam pressure. INDICATOR DIAGRAMS 335 486

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  • bookid:appliedthermodyn01enni
  • bookyear:1913
  • bookdecade:1910
  • bookcentury:1900
  • bookauthor:Ennis__William_Duane__1877_
  • booksubject:Thermodynamics
  • bookpublisher:New_York__Van_Nostrand
  • bookcontributor:The_Library_of_Congress
  • booksponsor:The_Library_of_Congress
  • bookleafnumber:351
  • bookcollection:library_of_congress
  • bookcollection:americana
Flickr posted date
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28 July 2014


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