er frames.

Struts.--The pieces which hold together longitudinally the main frame
beams.

Superposed.--Placed one over another.

Surface Area.--The amount of cloth-covered supporting surface which
furnishes the sustaining quality.

Sustentation.--Suspension in the air. Power of sustentation; the quality
of sustaining a weight in the air.

Triplane.--Flying machine with three surface planes.

Thrust of Propeller.--Power with which the blades displace the air.

Width.--The distance from the front to the rear edge of a flying
machine.

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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W.J. Jackman and Thos. H. Russell

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