ue of these is to be found in the steering gear, and the provision
made for the accommodation of a pupil while taking lessons under an
experienced aviator.

Immediately back of the aviator is an extra seat and an extra steering
wheel which works in tandem style with the front wheel. By this
arrangement a beginner may be easily and quickly taught to have
perfect control of the machine. These tandem wheels are also handy for
passengers who may wish to operate the car independently of one another,
it being understood, of course, that there will be no conflict of
action.

Frame Size and Engine Power.

The frame has 36 feet spread and measures 35 feet from the front edge to
the end of the tail in the rear. It is equipped with two rear propellers
operated by a Ramsey 8-cylinder motor of 50 horsepower, placed
horizontally across the lower plane, with the crank shaft running clear
through the engine.

The "Pennsylvania I" is the first two-propeller biplane chainless
car, this scheme having been adopted in order to avoid the crossing of
chains. The lateral control is by a new invention by Octave Chanute
and Laurence J. Lesh, for which Lesh is now applying for a patent. The
device was worked out before the Wright brothers' suit was begun, and is
said to be superior to the Wright warping or the Curtiss ailerons. The
landing device is also new in design. This aeroplane will weigh about
1,500 pounds, and will carry fuel for a flight of 150 miles, and it is
expected to attain a speed of at least 45 miles an hour.

There are others, lots of them, too numerous in fact to admit of mention
in a book of this size.

CHAPTER XVIII. DEMAND FOR FLYING MACHINES.

As a commercial proposition the manufacture and sale of motor-equipped
aeroplanes is making much more rapid advance than at first obtained in
the similar handling of the automobile. Great, and even phenomenal,
as was the commercial development of the motor car, that of the flying
machine is even greater. This is a startling statement, but it is fully
warranted by the facts.

It is barely more than a year ago (1909) that attention was seriously
attracted to the motor-equipped aeroplane as a vehicle possible of
manipulation by others than professional aviators. Up to that time
such actual flights as were made were almost exclusively with the sole
purpose of demonstrating the practicability of the machine, and the
merits of the ideas as to shape, engine power, etc., of the