12 Wilson and Noble, Entropy Diagrams. 



the point which was assumed has turned out to be too late 

 in the stroke. The dotted curves shew the result oi 

 taking an earlier release, with its corresponding alteration 

 in the clearance work. 



The dryness fractions, as obtained from these dia- 

 grams, agree very fairly with those calculated by Mr. 

 Longridge. They do not, however, agree with those 

 calculated by Captain Riall Sankey, probably because the 

 latter gentleman assumed a quality for the steam at cut-off 

 rather than at compression. On measurement, the area 

 of the diagrams as drawn was found to agree with that 

 given by the indicator cards within reasonable limits. 



Analysis of the heat losses has not been attempted, 

 partly because of the uncertainty in the amount of the 

 priming water, and the lack of information regarding the 

 points of compression and release, but chiefly because it 

 has been the intention of the authors to indicate the 

 method of reduction rather than to investigate the per- 

 formance of any particular set of engines. 



