444 MEASURING OF AIR. 



SUMMARY. 

 TABLE VI (g) 



Test Inlet air H.P. Discharge 



No. Bar. Hyg. Disch. Orifice 



CENTIGRADE. 



I 



II 



III 



IV 



\' 



The reductions of the readings of the ^nanometers and pres- 

 sure gauges are tabulated according to the nature of the gauge 

 used for observing the pressures. These were : — 



(i) Water gauges read in ni.ni. 



{2) Spring Pressure gauges. 



For the reduction of the readings we have taken : — 



I inch =^ 25.40 m.m. 

 Local g =32.11 ft. /sec- 



Standard g =32.17 



27.69 inches water = 1 ll)/s(i.in. at standard g & 32°F. 

 2774 V ,. = V M local g & \, 



27-79 V. „ = v. ,, „ g & 70° F. 



Average temperature of manometers = 70°F. 



By this means all the pressures are reduced to the standard 

 value of gravity. 



Tables VII (a) to VII (f) give the reduction of the observ- 

 ations of the water gauges used for measuring the drop across 

 the orifices. As has already been stated two were on the L.P. 

 intakes and one on the H.P. discharge. 



The differences observed between the readings of the two 

 manometers on the L.P. intake on the H.P. and M.P. sides is 

 due to the dift'erent setting of the butterfly valve regulating the 

 admission of air to the two sides of the Compressor. 



The readings on the discharge H.P. orifice were taken 

 independently by t^vo observers on the top and bottom of the 

 U manometer. 



Table VII (f) gives the Summary of these readings reduced 

 to pounds per scp inch. 



