THE RESULTANT PRESSURE RECORDER. 

 Fig. 1. 



23 



Ratio of the total normal pressure {Pa) on an inclined square plane to the pressure (P90) on 



a normal plane, the planes moving in the air with the same velocity. 



AbscissiB. Angles of inclination («) of plane to liorizon. 



p 

 Ordinates. -^=F(a') (expressed as a percentage). 



O Represents the mean of observed points for each angle of experiment. 



