The sun. [volume] (New York [N.Y.]) 1916-1920, 1919-03-24
WIRELESS TALK TO
LINK WORLD SOON
DR.. Fleming, Greatest British
Expert, Tells Of Rapid
Progress.
GREATER STRIDES NEAR
Cabinets of England and
Australia Soon to Con-
verse, Prediction.
Special Cable Despatch TO Tar son from the
London Times Service.

Special Gable Despatch TO THr son from tho
London Times Seruice.
COPYRIGHT. 1918: al rights reserved.
LONDON, March 23.--Dr ]. A. Fleming,
probably the greatest British wireless
expert, declares that members of the
Cabinet sitting in Australia ''before long
may exchange opinions with the Cabinet
sitting in Bondon by wireless telephone"
In a long and highly technical arti-
Gle in the Times engineering supplement
DR.. Fleming describes the progress OF
wireless telegraphy and telephony since
1918, due mostly to the war. OF great
value, he says. are the advances made
in directional wireless biography. Di-
rectional receiving stations now always
operate in pairs, thus enabling them by
trigonometry to locate precisely ship
or airship.
THE Germans" the article says,
used this method to determine the po-
sition of Zeppelins lost in the clouds over
the North Sea- We also used 1t to de-
termine their position for a different OBJ
ject. Admiral Jellicoe mention this use
Of directional wireless by the enemy.
which rendered great caution necessary
for use of wireless by an isolated ship
or convoy.
-Four such directional wireless sta
tons are now established on the coast
of Canada and when fogs are prevalent
ships several hundreds miles distant will
be able to ascertain their position by
making inquiry of these stations. The
control of aircraft through such direc-
tional wireless stations will be Of enor-
nous Importance"
The writer says the recent technical
improvements in valves have consti-
tuted a wireless receiver OF extraordi-
nary sepsitivity, "a detector that Is not
only a qualitative but a cumulative de-
tector and which therefore can be used
to receive articulate speech In radio tele-
phones. Telephone sounds can be made
loud enough to be heard in airplanes,'
even in spite OF engine noises.
Another very important development
Of the three electrode valve is due to the
discovery in 1918 that It could be used
for the generation Of electric oscillations
as we'll as their detection. We are able
to produce vigorous, high frequency os-
citations in an aerial wire and we are
able to make amplitude by means of a
miscrope placed in one or the other cir
cults Of the valve.
ITO effect radio telephony we have
to radiate from an aerial wire electric
waves, the amplitude Of which is varied
proportionately to variation in the air
pressure OF the air wave produced by ar
ticulate speech. For receiving aerial
messages at a distance the apparatus Is
provided with a valve detector which
enables us to hear this speech clearly.
by this combination Of a thermonic
generator and detector radio telephony
Is now perfectly conducted. Airplanes
and airships are provided with a trail
ing air wire or antenne and with Their
monte receivers and generators. Speech
is now possible to or from an airplane
so provided at a distance UP to 100
miles. Orders for man9uvres can be
issued from a ground station and re-
plies can be given.
by means of directional wireless and
radio telephony airplanes and airships
can have their location given them when
at height OF several thousand feet and
can be guided to their destination. So
sensitive are these modern valve re-
peuse with the long trailing aerial wire
and receive on a small enclosed direc-
tional aerial in the airplane. Radio
telephony is free from many difficulties
attending telephone speech through
cables and is clearly more articulate.
Radio telephony has already TO a
certain limited extent been accomplished
across the Atlantic, and before long per-
feet telephone transmission OF speech
by this means will be operated not only
across the Atlantic but probably even
from Great Britain to Australia"