The sun. [volume] (New York [N.Y.]) 1916-1920, 1919-02-10
PREDICTS 10000
MILE RADIO PHONE,
DR.. Lee De Forest Says New In.
ventiOn Will BE in Use
This Year.
AN AMERICAN CREATION
Credit Given to DR.. Alexander.
son for Marvel in Electrical
Engineering.

1t will be possible during 1919 for ~.
human voice. spoken into a transmlt,er
OF a radio telephone. say in New JERSEY,
TO he heard 10000 miles away, or nearly
half way round the world. according n
the prediction OF DR.. Lee de Forest. made
public yesterday by the De Forest Lab.
oratories at High Bridge. This .sa,
would extend the present wireless teie.
phone distance by 5000 miles az one
leap.
DR.. de Forest Is the inventor Of ire
three electrode vacuum tube. otherwise
known as the audion. the principal agent
which since the first wireless work b.
Marconi has made possible the dls,anc.
telephone line and also through Hertzan
waves.
1T may be OF interest TO the lay pms.
lie as we'll as to those scientincaily i7-
clined," DR.. de Forest said, 80 know
that as a result Of American engineering
ability the world is about TO see sroth.r
distinct advance In the rapid prosre"
of radio engineering.
Dr. Alexanderson's Work.
THE proposed advance in radio com.
munication, in my Judgment. is ALREADY
assured for the year 1919 as a result Of
the experiments conducted by DR.. Alex.
anderson OF tho General Electric Conn
pany, an American engineer. DR.. Alex.
anderson has been the worlds pioneer 10
the construction of high frequency alter
majors generating alternating current
which can be directly applied t. the an.
tenna and radiated for wireless sigma.
ling.
Ills latest creation is a eco k.lovst,
generator which produces alternating
current Of approximately 5000 meters
wave length. which has been FOR severa
months IN operation at the big navy
control station at New Brunswlck. TIL.
former large spark set. which was in
stalled at this station b. British owned
wireless concern. was, ms I'll radio engi.
ness predicted, complete failure ana
they were compelled TO call upon an
American engineer to save the situation
"Dr Alexanderson can now put $50
amperes or so kilowatt high frequency
energy in this huge antenna and has W.
der certain tests raised this as high as
$50 amperes. All this energy is con.
trolled by special magnetic control de-
vice which he has invented, ard this In
turn can be controlled by bank Of high
power aud!on amplifers ranged in 'pyra-
mid connection, so that an Ordinary
microphone controlling the first aud'on
amplifler which in turn controls larger
number 10 able through the magnetic
control to modulate in perfect conform
fly with speech waves the entire 80
kilowatts In the antenna.
Utility of the Audion.
This means that In short time we
can expect voice spoken in the trans.
rnitter in New Jersey to be heard ha'
way round the world Here also wi,
be another evidence OF the astonishing
utility OF the audion, first as an amp'-
fer to modulate or control practically
unlimited amounts OF energy at IRE
transmitter: second. to receive and de-
tect the ninitesimal energy received
half way round the globe: third. 70
amplify this received energy to any de-.
gree desired so that Z can he head
throughout a large auditorium, IL this M
desired
THE possibilities OF this radio a.
vance can at once be readily imag ned
It means In effect that by telephone
communication without wires the human
voice will be heard Just as plainly BE-
between New York and BrcoNiyu !,
means that The music lovers ~ New
Zealand or any other country equally
distant will he able to enjoy tho i,'css.
ures OF vocal or instrumental Coz trt'
given in New York or any part u ma
world"