The San Francisco call., 1910-07-06
"YANKEE DOODLE"
sung BY WIRELESS
Patriotic Notes Float o.. Ether
Waves From Stockton TO
San Francisco

yankee Doodle Dandy rode
through the ar f~om toc,lton to San
Francisco yesterday e waves of ether
He was started on 5is aerial flight
from the Poulsen wireless telephone
and telegrah. company stations at the
Slough City and was corraled in his
travels by the ready antenna of the
company local station in the block Of
land bounded by N and Q streets and
E'orty-seventh and. Forty-eighth ave-
,nues east Of the great highway.
Yankee Doodle" was sung by the
operators at the interior station and
the tune was heard as distinctly in San
Francisco as if the singer was at a
common telephone but a few blocks
away. In addition TO the vocal num-
bers. the stations interchanged greet
ings by the Morse telegraphic code and
the apparatus performed other func-
tions of communication.
The Poulsen company has erected a
500 foot tower in its lot and yesterday
gave a demonstration Of the efficiency
OF the new system. The exhibition was
conducted by 2. Jensen Of Copenhagen.
chief operator, who was student of
Poulsen. the inventor, in Denmark. C.
r Elweil, president of the company,
was in charge of the demonstration.
SIGNALS BY TELEGRAPH
In beginning his demonstration yes
terday Jensen called up the Stockton
snd also the Sacramento stations on
the telegraphic key and then notified
each over the telephone to transmit
dots and dashes representing two let
ters and 10 keep il up for five minutes.
In less than Two minutes the messages
were received simultaneously on two
telephones in the station. Then the
program was varied by songs sang by
the distant operators.
Transmission by the ticker was then
demonstrated. Jensen, working on a
small, three keyed instrument, punched
on narrow paper ribbon in the Morse
alphabet the question: How is the
weather in StOckton?" He placed the
tape in a rapid transmitter and it went
TO Stockton at the rate of $50 words a
minute. The message at its destina-
tiOn was received on similar machine.
In a few moments the answer flew
back Hot; goodbye"
The Improvement in the Poulsen
system over the spark system" said
President ElweIl, is that it can be
operated day or night over land or sea,
AT any time and for great distances.
II has a capacity of 800 words a minute.
The capacity Of a station is SOC, 600
words in , hours each way. The spark
system can be used only at night and
is intermittent, while this is continuous.
The secret of the Poulsen syste mis-
an arc inclosed in an atmosphere of
hydrogen between a water cooled cop
per and a carbon end in the generator,
which changes into frequency cur
rent that produces 100000 vibrations
a second and is known as the 'un-
damped oscillation waves for wireless
transmission
4s0 STATIONS PLANNED
It is intended TO establish $50 sta
tions in this country. 10 in this state,
Washington and Oregon, and one at
Honolulu.
II is expected that the system. which
will cost $4,000 for each station in
the larger cities, viii create a revolu-
tion in teiegraphy, as II viii be pos
sibie to send messages 10 Honolulu at
any time and in any Kind Of weather
at a 10 cent per W-piO rate and to
ordinary points all o. the United
States for 1 cent wor..
In few days another tower Of the
same height will be erected at the
local station and provided with en-
larged antenna, which viii increase the
audibiIity OF the messages received
and then there will be three receiving
and sending points which can be oper-
ated at the same time without inter
fering with one another, and by a pat
tent tinker and a detector MESA ges
can not be picked up by another
system.