AIR COMPRESSORS 



The accompanying table shows that the capacity of the 

 8f-in., cross-compound compressor is over 3| times that of 

 the 9f-in. and 2J times that of the 11-in. compressor. 



COMPARISON OF 9J-IN., 11-IN., AND 8HN., CROSS- 

 COMPOUND, AIR COMPRESSORS 



COMPARATIVE TESTS OF 11-IN. AND 9J-IN. AIR 

 COMPRESSORS 



TEST No. 1, TIME REQUIRED TO PUMP FROM TO 90 LB. 

 PRESSURE WITH I-!N. STEAM AND IJ-lN. EXHAUST PIPE 



