Langley Memoir on Mechanical Flight, Parts I and II / Smithsonian Contributions to Knowledge, Volume 27 Number 3, Publication 1948, 1911

by S. P. Langley; Charles M. Manly

B. One sheet, comprising a tracing of a single wing, and from which the area was also computed. This area, multiplied by 2, gives the same result as the sum of both wings on A₁ and A₂. The compo-board pattern C was made from this tracing.

C. Compo-board pattern of fully extended wing, on which the center of pressure is indicated.

D. Compo-board pattern of wing in soaring position, on which the center of pressure is shown. [p292]

E₁. Photograph of bird in soaring position, suspended horizontally.

E₂. Same, enlarged to natural size.

F₁. Photograph of bird in soaring position, suspended vertically.

F₂. Same, enlarged to natural size.

G. Tracing of wing in soaring position, from which the compo-board pattern D was made.

EXHIBIT F₁.—Turkey Buzzard suspended vertically in soaring position. (R. P. Currie.)