power has been reduced, and the speeds are 30,
25, and 20 miles per hour, in positions A, B and C.

Suppose that in either position the power should
cease, and the control broken, so that it would be
impossible to move the planes. When the machine
begins to lose its momentum it will descend on a
curve shown, for instance, in Fig. 15, where position
1 of Fig. 14 is taken as the speed and angles
of the plane when the power ceased.

_Fig. 15. Utilizing Momentum._

CUTTING OFF THE POWER.--This curve, A, may
reach that point where momentum has ceased as
a forwardly-propelling factor, and the machine
now begins to travel rearwardly. (Fig. 16.) It
has still the entire supporting surfaces of the
planes. It cannot loop-the-loop, as in the instance
where the planes are fixed immovably to the body.

Carefully study the foregoing arrangement, and
it will be seen that it is more nearly in accord with
the true flying principle as given by nature than
the vaunted theories and practices now indulged
in and so persistently adhered to.

The body of a flying machine should not be oscillated
like a lever. The support of the aeroplane
should never be taken from it. While it may be