The Hawaiian gazette., 1912-06-04
AUGUST JFIRST
WIRELESS
DATE

ifa AAi hArA VI hNNN aAhkhnN AAIhNAhAN
will be in direct wireless communica.
tion with San Francisco, thence by re.
lays with FL Paso, Kansas City, st.
Louis and Chicago.
This is the statement made by Cyril
F. Elwel, chief engineer of the Fed
eral Telegraph Company, who is busily
engaged in experimenting the erection
of a complete wireless plant for his
company on the shores of Kanoohe bay
on the other side of the island.
For the complete plant two hundred
tons of material will be required of
which one hundred and seventy tons
were unloaded from the Siberia on her
last trip, and are now awaiting trans
portation to the seat of operations of
the company on this island.
This installation is in no sense by
way of an experiment. All the neees-
sary experimenting has already been
done and the construction now going
forward is of a most permanent nature.
To determine the effectiveness of the
Pouscn system of wireless telegraphy
(whose patents in the United States
are controlled by the Federal Tele-
graph Company over the two thou.
sand miles of sea between the Island
of Oahu and San Francisco satisfactory
experiments, so far as receiving mes.
sages are concerned, were concluded
several weeks ago. Messages were re-
ceived at that time from the San Fran.
cisco plant of the company by Poul-
sen detector which was taken to Ka-
huku. The transmission was so perfect
that the company lost no time in ar
ranging for the installation of the
plant at Kaneohe. If messages can be
received from San Francisco, there is
no reason why they cannot be sent
there with the proper equipment, says
Mr.. Elwell.
Large Equipment.
At Kaneohe two steel masts, reach
ing height of four hundred and thir-
ty-eight feet, will be erected, on which
will be strung antennae consisting Of
thirty-fve hundred feet of wire. A
sixty horsepower gasoline engine will
be installed to drive the current gen
orators. The station will be equipped
with two thirty kilowatt Poulsen gen
orators. In fact, everything in the
station will be in duplicate to avoid any
possibility of an absolute breakdown.
One of the great features of a wireless
system is that if there is breakdown
it is right there in the station and can
be readily repaired if apparatus is in
duplicate.
An eight-room operating house will
also be built, as will substantial pow
,er house, which will be equipped with
liz small electric lighting plant, water
, system and a gas generating plant.
In this connection it may be explain
ed that the Poulsen system consists of
an electric are which takes place be-
tween a copper and carbon in the
presence of vapor containing hydro
fgen. This are when connected with the
antennae radiates energy throughout
all space, and is controlled by means
, of an ordinary Morse key.
Mechanical Sending.
At first messages viii be sent using
, the Morse key with the Continental
code system. Later, as soon as the
business justifes it, further advance
in the art of wireless telegraphy viii
be installed at the Kaneohe station
This is known as the Rapid Telegraph
Transmitter and Receiver. BY means
of this instrument upwards of three
hundreds words a minute can be sent
and received. With this method the
tape is punched as in the ordinary
Wheatstone method of sending, and
the message is received photograph
Iool %, nf
machine developed and fixed, ready for
translation. 1t is stated that the trans
lation is easily made, because the dots
and dashes are very plain-much plain.
J er than cable message which is re-
ceived in similar manner
The station-indeed, every station of
the Poulsen system-will be equipped
with duplex sender, enabling two op.
orators to receive or transmit two mes.
sages at the same time on a single wire
This will enable the Oahu station to
be receiving messages from the East
and West simultaneously; for it is
the intention of the company to link NJ
its system with the Philippines, as soon
as the Oahu plant is completed In or.
! der to do this a relay station will have
to be established at some point between
here and the Far East, probably al
Guam or Midway Island.
Different System.
In contrast with other systems of
wireless telegraphy it should be noted
that in using the Poulsen system the
ether waves are radiated continuously,
while with other systems they are rad
lated internationally. The difference in
efficiency between them Is said to be
enormous. II is much easier TO avoid
interference by other stations in the
continuous radiation system than in the
use of the intermittent system.
4" Indeed, 4" said Mr.. Elwell, yester-
day, "the Pousen system Is TO wire
less as the ineandescent lamp is Ia
lighting The are light or spark system
came first, with valuable but limited ap.
ploaton; then came the incandescent
lamp capable of wide application. Now
has come 10 augment the manifold ap,
plications Of wireless the I'oulsen sys.
I -. A -