Page:Aerial Flight - Volume 1 - Aerodynamics - Frederick Lanchester - 1906.djvu/225

Rh is normal. This is one of the many experimental disagreements that at present are far too common in aerodynamics.

§ 148. The Square Plane.—Centre of Pressure.—According to the Newtonian hypothesis, the centre of pressure on an inclined plane should be coincident with the geometric centre. In real fluids this is found not to be the case.