Wind Pressure.--The force exerted by the wind when a body is moving against it. There is always more or less wind pressure, even in a calm.

Wing Tips.--The extreme ends of the main surface planes. Sometimes these are movable parts of the main planes, and sometimes separate auxiliary planes.

Footnotes:

[Footnote 1: Now dead.]

[Footnote 2: Aeronautics.]

[Footnote 3: See Chapter XXV.]

[Footnote 4: The Wrights" new machine weighs only 900 pounds.]

[Footnote 5: Aeronautics.]

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