Evening journal., 1919-02-10
PREDICTS $4,000
Mile RADIO Phone
DR.. Lee De Forest Says New
Inv e ton Will be in
Use This Year
IS CREATION OF
AME RICAN GENIUS

NEW YORK. Feb. i0-It will be pos
sible during 1919 for the human vo.cs,
spoken into a transmitter or radio
telephone, say In New Jersey, to be
heard 1900 miles away, or nearly half
way round the world, according to the
prediction Of DR.. Lee de Forest. made
public yesterday by the De Forest La
boratories at High Bridge. This feat
would extend the present wireless tele-
phone distance by 5000 piles at one
leap.
DR.. de Forest is the inventor Of the
three electrode vacuum tube, otherwise
known as the audioD, the principal
agent which since the FIRST wireless
work by Marconi has made possible the
distance telephone line and also
through Hertzian waves.
1T may be OF interest TO the lay
public as well as 10 those scientifically
Inclined" Dr. de Forest said, ''to know
that as a result OF American engineer
Ing ability the world is about TO see
another distinct advance in the rapid
progress Of radio engineering.
DIR. Alexanderson's Work.
The proposed advance in'radlo COM
munlcation, in my judgment, Is already
assured for the year 1919 as a result "
the experiments conducted by DR.. Alex
anderson OF the General Electric Com.
pany. an American eng,nee. DR.. Alex
anderson has been the worlds pioneer
in. the construction Of high frequency
alternators generating alternating cur
rent which can be directly applied 70
the antenna and radiated for wireless
signalf ng.
His latest creation. is a 200 k'lowatt
generator which produces alternating
current Of approximately 1900 meters
wave length, which has been for sew
erol months IN operation at the big
naval control station at New Brunswick.
The former large spark set. which was
installed at this station by a British
owned wireless concern, was, as all
radio eng neers predicted, complete
failure and they were compelled 10 call
upon an American engineer to save the
''Dr Alexanderson can now put 4S0
amperes or 80 kilowatt high frequency !
energy in this huge antenna and has
under certain tests raised this as h 'gh |
as 80 9mperes. All this energy Is con-
Lrolled by a special magnetic control de-
vice which he has invented, and this |
In turn can be controlled by bank OF
b 'gh power audion ampliflers ranged In /
pY amid connection. so that an ordi-
nary microphone controlling the first |
audiou amplifler which In turn controls |
a larger number Is able through the |
control 10 modulate In per-
feet conformity with speech waves the
entire so kilowatts In the antenna.
Utility OF the Audlon.
"This means that in a short time we
can expect a voice spoken In the trans |
m.tter In New Jersey - be heard half /
way round the world Here also Will |
be another evidence OF the astonishing /
utility OF the audion, FIRST as an ampll-
Der TO modulate or control practically
unlimited amounts Of energy at the
ransmitter; second, TO receive and de-
ect the infnitesimal energy received
lalf way round the globe; third, g.
mplify this received energy to any de-
ree desired so that It can be neari
throughout a large auditorium, If this
le desired
The possibilities OF this radio ad-
anoe can at once be readily imagined.
means in effect that by telephone
without wires the hu-
nan voice will be heard Just as plainly
New York and New Zealanu
5 between New York and Brooklyn. II
leans that the music lovers Of New
ealand or any other country equally
stani Will be able to enjoy the pleas
res OF vocal or instrumental concerts
.ven in New York or any part Of the
,Orld."