New-York tribune., 1904-09-19
LONG WIRELESS MESSAGE.
PLANNING ONE.
To Experiment scith Signals Sent
from COrnUaU to australia.

William MarconI who arrived here yesterday
on the steamship Arabic. talked modesty but
hopefully later about the future of wireless te
legraphy. He has not come to America. as had
been announced 20 take part in the Interna-
tIonal Congress OF Arts and Sciences in St.
Louis He intends 20 remain In the East for
two or three weeks, spending most of that time
in Canada An italian friend wifi represent him
in the West
The visit now made to this country is pre-
lininary TO an important series OF tests which
Mr. Marconl has IN Wow. These will ascertain
hitherto untried possibilities and requirements
of long distance work In February. 1902
distinct message vas received on the steamship
Philadelphia. westward bound. when she was
over fifteen hundred miles from Poldhu. Corn
wall. and mere signals we're recognized twenty
one hundred miles away. one OF the discoveries
OF that voyage was that the system operated
more successfully by night than by day sun
light exerting some kind Of a paralyzng inhu-
ence This phenomenon was carefuiIy stnHied
tie following summer. Arrangements were
r,ade for sending messages and signals "a Mr..
Marconi while he was the Italian warship
Carlo Alberto. from Polihu Communication
was attempted regularly every day Tor one hour
after noon and three hours after midnight ana
the difference in distinctness was noted The
vessel first puSne0 INTO ZIG A'"4NA~ 49, 49,
cronstadt fully twelve hundred miles from
Poldbu Then II came back. visited Gibraltar
and Cadiz. only nine hundred miles distant out
separated from England by the lofty mountain
masses OF Spain.
The next great experiments will be similar 10
these in character, but OF wider scope me u
tempt VIII be made to find out What are ttt'
dtf9cul,,as tn he overcome I'm legraphing win
Hertz waves half way around the world!
shin. either English Italian VIII be ntteu up
with the same kind OF apparatus Whlch was
used on the Carlo Alberto. and Poidhu VIII 90
it's best to maintain communication with her.
At a time which is not yet fully determlhea
the ship will start from some Italian port ana
proceed toward New-Zealand. which is on the
opposite side OF the globe from Cornwall IL
is almost 1886. degrees of longitude distant ana
nearly as far south of the equator as Podhu
is to the northward. II the vessel which Is soon
10 engage in this significant mission shouid con-
tinue to get even the faintest signals wheh she
was in the vicinity of New-Zealand II would
be safe to infer that only a trthinh improve
ment would be necessary to establish commuhi-
cation between any two points on the ear'h IL
distinctness utterly failed before the end OF the
voyage-say. in the Indian Ocean-it would he
evident that greater increase In the capacity
of the generating station was required.
It should be added that ono set Of observa-
tons will be devoted to testing the power OF the
station in Cape Breton. That is one reason why
Mr. Marconi will visit that place within the
next few days. From Table Head, near Sydney. to
Italy the distance is about three thousand
miles-possibly more. If the ship can once be-
gin receiving messages from America while she
is in the Mediterranean. the time when and the
place where service grows unsatisfactory will
tell a story Of additional interest from prac-
tical point of view
Although Mr.. Marconi has few applications
for patents still pending. he feels that he now
has at his disposal all the essentials OF efficient
work. Success is apparently only a question
of power behind the Hertz wave generators.
How much is needed can be told only by test
ing. It cannot be safely computed. more
sensitive receiver, the magnetic detector is now
used i'm place Of the old coherer. ON the Carlo
Alberto both tried. and each was con-
nected Mt times with the Morse recorder and
with the telephone earpiece
During those historic and Illuminating tests
two years ago and in the partially successful
attempts to communicate between America and
England in the winter OF 19O2-'O3 il was found
that daylight was rot the only embarrassing
Influence 10 he evaded overcome. other
causes affected the distinctness with which sig
mails and messages came IL mainly TO per-
nit of a closer study of these that Mr.. Marconi
refrained from endeavorng 10 carry his trans
atlantic business projects into effect eighteen
months ago. He does not believe that there has
heen any malicious interference with his work.
either I'm Europe or America. When reminded
of the threat in which the German inventor DIR.
Slaby once indulged-a proposition to create
confusion at Podhu by sending Hertz waves
IRON, the continent at the same time that mes
aZes were being received from America-dr.
NarconI merely smiles and says, THAT would
bardI,y he possible" He also discredits the sug-
gestion that any similar mischief has been tried
on this side OF the Atlantic. to affect his re-
ceivers al Table Head or Cape Cod
A second motive for resuming tests at Table
Had is 10 clear the way for a transoceanic
ssr-Jce Mr. Marconi will not tx date for
nu,ti,p II on commercial basis but he is con-
GSent that the contamination is near at hand
T,he great success of the daily news dispatches