Evening star., 1924-09-03

inventor, c. Francis Jenkins, has
discovered a law of physics which
has hitherto baff1ed science. This
law threatens to revolutionize flight.
Applying the new law, he has con-
structed an artificial bird" which
flies against the strongest wind OF
an electric fan, and would plunge
directly into the fan IL not restrained
by a cord. The stronger the fans
wind, the stronger does the artificial
bird fly against 1t.
1t has long been observed that an
eagle and certain other large birds
can soar" without perceptible
futter of their wings and can travel
against strong winds by such motion
less soaring" How the soaring
birds can thus defy gravitation and
| oppose almost hurricanes, has puz-
zled science. Mr.. jenkins seems to
have discovered the principle in
volved His principle has been SUBJ
mitted to the United States Bureau
of Standards and there recognized as
something new in physics. 1t has
been submitted by the Bureau OF
Standards to the Boston Institute of
Technology, which has not explaine ed
II. The Bernouille. theorem and the
ventura tube" familiar to experts
in aeronautfcs. do not cover the
thus expresses his principles:
ANY object free to move in a fluid
will move toward that part of the fluid
having the swiftest motion"
For example, IL a chip be thrown into
a swiftly flowing stream it will quickly
go to the center where the water flows
the most swiftly. If grain be poured
upon rapidly moving carrying belt,
such as is used in grain elevators, the
loose grain will heap itself up in the
middle of the belt, and will not spill
off the sides. If "a bird wing is given
certain shape, with correct stream
lines, the swift stream of air it meets
in flight against the wind will divide
above and below the wing, and that
which passes above will suck the
wing upward with from two to three
times the lifting force of that which
pushes it UP from below. The sustain
ing power Of the air above an airplane
wing is far greater than Of the air be-
low the wing. Suction is not merely
opposition of air pressure against a
vacuum. What is it?
Take a common spool and clean of
the paper pasted across the ends. Cut a
bit Of cardboard, the size of the end OF
the spool. and stick a pin through the
middle, letting 1t lie loosely in the hole
in the spool, so that the pin will keep
the card from slipping sidewise. Blow
through the hole in the spool without
blowing outside. and it will be found
impossible to blow that bit OF cardboard
off the spool. The stream of air thus
blown is swiftly moving. and SO the
cardboard will move toward the fluid
having the swiftest motion" and press
the harder against the spool the harder
the blowing.
Mr.. Jenkins explains that il does not
account for the phenomenon to say that
the air pressure above the card holds
it against the reduced air pressure in
side OF the SPOOL" for the air inside had
the same pressure as the air above, be-
fore the blowing, and whatever pres
sure within is added by the blowing
an ounce or pounds-is just that much
additional pressure against the card
puff 1t does not dislodge the card. 1t is
not a case of vacuum and air pressure
Opposition thus creates power of re-
sistance, and when that principle is
properly applied to aviation. the glider
with proper streamlines, will fly strong
est against opposing wind, and do sc
without any self-propulsion from gas
engines, even though heavier than air
The soaring birds are heavier than air
anu tHey sodT Will dppdreHti! MOTION
less wings, because any bird. free &c
move in fiuid-air-will move iowa rd
that part of the fiuid-toward the poin,
from which the fluid--the air--has the
swiftest motion" r-....-
How soon will dirigible lighter-than-
air balloons be out of date?
Where is Darius Green, who might
exclaim:
The birds soar high,
So soar will i -
tConyripbt 1904 bv p,pl V rou;ns