ed
of cloth or other flexible fabric, as we prefer to construct them, these
surfaces may receive more or less curvature from the resistance of the
air, as indicated in Fig. 3.

We do not wish to be understood as limiting ourselves strictly to the
precise details of construction hereinbefore described and shown in
the accompanying drawings, as it is obvious that these details may be
modified without departing from the principles of our invention. For
instance, while we prefer the construction illustrated in which each
aeroplane is given a twist along its entire length in order to set its
opposite lateral margins at different angles, we have already pointed
out that our invention is not limited to this form of construction,
since it is only necessary to move the lateral marginal portions, and
where these portions alone are moved only those upright standards which
support the movable portion require flexible connections at their ends.

Having thus fully described our invention, what we claim as new, and
desire to secure by Letters Patent, is:--

1. In a flying machine, a normally flat aeroplane having lateral
marginal portions capable of movement to different positions above or
below the normal plane of the body of the aeroplane, such movement being
about an axis transverse to the line of flight, whereby said lateral
marginal portions may be moved to different angles relatively to the
normal plane of the body of the aeroplane, so as to present to the
atmosphere different angles of incidence, and means for so moving said
lateral marginal portions, substantially as described.

2. In a flying machine, the combination, with two normally parallel
aeroplanes, superposed the one above the other, of upright standards
connecting said planes at their margins, the connections between the
standards and aeroplanes at the lateral portions of the aeroplanes being
by means of flexible joints, each of said aeroplanes having lateral
marginal portions capable of movement to different positions above or
below the normal plane of the body of the aeroplane, such movement being
about an axis transverse to the line of flight, whereby said lateral
marginal portions may be moved to different angles relatively to the
normal plane of the body of the aeroplane, so as to present to the
atmosphere different angles of incidence, the standards maintaining
a fixed distance between the portions of the aeroplanes which they
connect, and means for imparti