Attempts to construct it on a scale that would permit
of its use by man in actual aerial flights have been far
from encouraging.

Three Kinds of Aeroplanes.

There are three forms of aeroplanes, with all of which
more or less success has been attained. These are:

The monoplane, a one-surfaced plane, like that used
by Bleriot.

The biplane, a two-surfaced plane, now used by the
Wrights, Curtiss, Farman, and others.

The triplane, a three-surfaced plane This form is
but little used, its only prominent advocate at present
being Elle Lavimer, a Danish experimenter, who has not
thus far accomplished much.

Whatever of real success has been accomplished in
aviation may be credited to the monoplane and biplane,
with the balance in favor of the latter. The monoplane
is the more simple in construction and, where weight-
sustaining capacity is not a prime requisite, may
probably be found the most convenient. This opinion is
based on the fact that the smaller the surface of the
plane the less will be the resistance offered to the air,
and the greater will be the speed at which the machine
may be moved. On the other hand, the biplane has a