43^ MEASURING OF AIR. 



x'\verages over test 24.888 70.0 20.7 6.8 



Temp, correction —0.093 



Corrected Barometer 24.795 



Dry Bulb°F. = 69.3 = f 

 Wet Bulb°F. = 44.2 = t^ 

 t-t, = 25.1 

 Pressure of saturated a(|ueous vapour (t^) 1= 0.289 == /^ 

 0.000367 B (t ~ t,) (1 + [t -t,) / 1 57 1) = 0.233 = /., 

 A'apour pressure [f.—f^) =0.057 = / 



Pressure of saturated vapour (/) ^ 0.715 = F 



Relative Plumidity. = 8.0% = f/F 



Note: In tables I (a) to I (e) all pressures are in inches 

 of mercury under standard value of gravity. 



TABLE 1(f) 



In order to reduce pressures to standard value of gravity the 

 following standard constants have been accepted. 



I inch Hg. column at 32°F. = 0.491 Ibs./sq. in. under stand- 

 ard value of gravity g = 32.17 ft./sec.- 



The local value oi g = 3-2.1 1 ft./sec." 



Hence i inch Hg. coku-nn = 0.491 X 32.1 1/32. 17 



:= 0.490 lbs/s(|.in. at 32° F. 



Absolute temperature = 459-4 + ^°F. 



The above Table I ( f ) reduces to 



TABLE II. 



From the foregoing data and from No. 28 of Smithsonian 

 Tables the weight of moisture present in the air taken in by 

 the Compressor has been calculated and the results are stated 

 in Table III. 



