Mineral Point tribune. (Mineral Point, Wis.) 1869-1938, 1919-02-20

rotf Of when dwarf aetia!s proieci-
ed, put receivers over our ears, and
a moment later / heard strong voice
say:
by the right flank" Then there
was second of hesitation, followed by
a stentorian, long drawn-out Go" and
away eff in the eastern heavens saw
thu long line Of small dots swing off
to the right and for the moment, out
of sighl. And those words came frgH
Major Rossell spoken in an ordinary
tone, 5000 feet in The air and fully
five miles from where l was standing.
And | was informed that it would
have been just the same if he had
been further away. However, the
range of the new wireless telephone
is one of the secrets that the division
of military aeronautics is not reveal
ing just now
For more than an hour / heard
Major Rossell put his squadron
through a drill and at the same time
that | heard his orders l saw them
executed. These things took place
while these 10 airplanes were rushing
along at more than "A hundred miles
an hour at an altitude ranging from
4,0o0'to 6,0OO feet, and with the man
giving the order fully two miles from
the nearest of his men.
The apparatus used for wireless
telephoning is so simple and so COM
pact that one would never notice
either the transmitting or receiving
devices on an airplane unless his at
tention was called to it. With the
consent of General Kenly Colonel
Culver gave me great deal of In
formation about these devices and the
following facts are the first published
about what perhaps is the greatest
invention Of the war.
Description of Device.
The transmitting set consists of
power plant, a set box, a transmitter
or microphone and an antenna sys-
TEN. The power plant consists of
generator driven on the windmill prln-
ciple by the passage of the airplane
through the air. 1t is placed some
where in the open, usually on the run
ming gear or on one of the wings, and
its tiny propeller blade whirls vigor-
ousiy us the airplane travels along.
The so-called set box receives the
power from the generator, converts it
and places it on the aerials in the
form of sustained or undamped waves.
The voice entering the transmitter
varies the electric current on the
wires, which are connected as in the
ordinary telephone. In the set box
the variations received from the trans
mittor, are converted and act to effect
a incubation Of The continuous or I'M
damped waves already referred to.
The antenna system consists Of an
aerial of one or two trailing wires of
approximately 100 feet in length,
strung out from the'wing tips. This
is counterpoised by the wires and 9TH
or metallic parts Of the airplanes all
bonded together. These two elements
of the antenna system are analogous
TO large overhead wires and to the
ground" of a land wireless station.
The receiving set consists of a re-
ceiving set box, head receiver, a
source OF power and an antenna sys-
TEN, The latter is the same as the
antenna system in the transmitting
set, The source Of power is a small
storage battery. The head receiver is
built into the aviator's helmet in such
Il manner us to exclude sounds from
the motor reaching the pilots ear and
interfering with his hearing. The set
box proper contains apparatus quite
similar to the receiving apparatus of
a first-class wireless station. How
ever 1t possesses a number of refine
ments over these which increase the
audibility of incoming signals, with
stand vibration and minimize weight.