AriL\SirkING f)F ATR. 461 



TABLE IX 



Sitjiniiary of absolute pressures in Ibs/sq. iiieh. 



As stated before the compressor has a suction capacity of 

 7,500 cu.ft./min. at 75 revolutions per minute, liable X gives the 

 a\erage numiber of revolutions per minute for the ditferent tests 

 and from these the weights of air drawn per sec. are calculated. 



The temperature measured in the suction chamber of the 

 L.P. Cylinder is taken far this calculation as being the tempera- 

 ture inside the cylinder at the Ijeginning of the compression stroke- 

 although as ])ointe(l out l)efore, these temperatures cannot be 

 equal. By special indicator cards, taken with a very weak spring 

 during the tests, it was proved that the pressure inside the cylinder 

 at the beginning of the compression stroke is equal to the baro- 

 metric pressure and this pressure is therefore used for the pur- 

 poses of Table X. 



TABLE X. 



Weight of air taken /;;. 

 Test IL IV . V^ Vl" 



Revs, per min. 71.45 76.80 77.54 75.14 



Cu. ft. of air drawn in per min. 71.45 76.80 77.54 75-14 

 Temperature at L.P. suction 



chamber °F. 82.0 87.8 87.8 86.2 



Absolute Temperature °F. 541.4 547-2 547.2 S45.6 



Stm. pressure 12.21 12.18 12.18 12.18 



lbs of air per sec. 7.25 7.693 7.768 7.55 



