452 MEASURING OF AIR. 



As no condensed water vapour was taken from the inter- 

 cooler during the test the same values of R and K are used here 

 as for calculating the air taken in. 



In the calculation of the weight of air taken in, it wasi 

 shown that the term {,pjp-i_)'/'^ could have no influence on 

 the result as A is infinite and ca/A is zero. This is not the 

 case on the discharge side where the value of {ca/A)- is 0.1388. 

 Table XI(a) gives the value of [p-Jp\)'/'^ for the discharge 

 orifice. The resulting value of the equivalent area, /(«)• is 

 given in Table XI (b) which also gives the weight of air 

 delivered given in Table XI corrected for the new value of the 

 equivalent area ; it is seen that this correction is only i part 

 in 1,000. 



TABLE XI (a). 



We are now in a position to compare the " Weight of air 

 tjaken in " of Table X measured with a pair of shaped orifices 

 with air at low pressure with the " Weight of air delivered " of 

 Table XIII measured with a single plate orifice with air at 

 high pressure. This comparison is given in Table XI\'. 



TABLE XIV. 



Test No. Air taken in Air sent out Diff. Mean Weight, 

 lbs/sec. lbs/sec lbs/sec. 



Totals 100.45 98-99 146 99-73 



