ipped with an automatic stability device for maintaining the balance
transversely. The curvature of the planes is also laid out on new
lines. That this new plan is effective is evidenced by the fact that the
machine has been elevated to an altitude of 40 feet by using one-half
the power of the 30-horsepower motor.

The system of rudder and elevation control is very simple. The aviator
sits in front of the lower plane, and extending his arms, grasps two
supports which extend down diagonally in front. On the under side of
these supports just beneath his fingers are the controls which operate
the vertical rudder, in the rear. Thus, if he wishes to turn to the
right, he presses the control under the fingers of his right hand; if to
the left, that under the fingers of his left hand. The elevating rudder
is operated by the aviator's right foot, the control being placed on a
foot-rest.

Motor Is Extremely Light.

Not the least notable feature of the craft is its motor. Although
developing, under load, 30-horsepower, or that of an ordinary
automobile, it weighs, complete, hardly 100 pounds. Having occasion to
move it a little distance for inspection, Mr. Burgess picked it up and
walked off with it--cylinders, pistons, crankcase and all, even the
magneto, being attached. There are not many 30-horsepower engines which
can be so handled. Everything about it is reduced to its lowest terms
of simplicity, and hence, of weight. A single camshaft operates not
only all of the inlet and exhaust valves, but the magneto and gear water
pump, as well. The motor is placed directly behind the operator, and the
propeller is directly mounted on the crankshaft.

This weight of less than 100 pounds, it must be remembered, is not for
the motor alone; it includes the entire power plant equipment.

The "thrust" of the propeller is also extraordinary, being between 250
and 260 pounds. The force of the wind displacement is strong enough to
knock down a good-sized boy as one youngster ascertained when he got
behind the propeller as it was being tested. He was not only knocked
down but driven for some distance away from the machine. The propeller
has four blades which are but little wider than a lath.

Machine Built by Students.

Students at the University of Pennsylvania, headed by Laurence J. Lesh,
a protege of Octave Chanute, have constructed a practical aeroplane of
ordinary maximum size, in which is incorporated many new ideas. The most
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