Page:Aerial Flight - Volume 1 - Aerodynamics - Frederick Lanchester - 1906.djvu/374

§ 232 the Memoir, and a “corrected” curve drawn accordingly. The explanatory paragraph is as follows:—

“The values in the Tables are subject to a correction resulting from a flexure of the balance arm and its support. It was observed that the trace of the plane, set at 90 degrees, did not coincide with the horizontal (i.e., the perpendicular to the vertical) line marked on the trace, but was uniformly 4 degrees or 5 degrees below it; so that the angle between the vertical and the trace of the plane did not measure 90 degrees, as had been