454 



KEPOKT 1889. 



of the compressors is, as given in Table, 61 per cent. It will be seen 

 from the diagrams that the compression curve falls only a little below the 

 adiabatic, and as the area of the diagram is increased somewhat by the 

 resistance of the discharge valve, the work done is practically the same as 

 if the compression had been adiabatic, and there had been no cooling at 

 all. This matter I have already referred to. 



S3&3Hd30IAIJ.V Nl 3ynSS3>id 



Fig. 3 shows graphically the relation between the quantities so far 

 measured. If the area ABODE represents on any scale the work done 

 in the steam cylinder, the area A B C F represents on the same scale the 

 work done on the air in the compressors. C B is an adiabatic curve, C G 

 an hyperbola, so that A G represents the volume of the compressed air 



