The evening times. [volume] (Washington, D.C.) 1895-1902, 1901-03-06

from one moment to another a different
accord. such as to be able to correspond
with the three stations Brussels, Antwerp
and Liege-
! In practice, this can be obtained by
GiSpoSing the three contacts, each being
| able to include in the circuit a capacity.
! a 'SeII-iuductiOn. and a resistance.
larger or smaller, according to the case
| For the three stations three different &C
! cords correspond TO the contracts: the ac-
> cord l IS the same at BCiSSelSr AntNtIp'
| and at Iiege. also the accord and .. me.
| three stations, being at variance, cannot.
| be in communication When Brussels
| wishes to communicate with Antwerp. the
| contact is shut. and consequently II
I passes on to the , period Brussels Is
/ the min accord with Answerp. which re-
CeiyeS the signals while ElsE5e winch mas
! the. period q. does net answer. " hen the
! communication is finished the Brussels
/ station returns to then formal accord l or
I passes on to the , -contact. in which case
| antwerp does not reply To prevent Lde2c
upsetting the Irussels--AlftsreFp ceIaIpiI-
| niCatiOn by passing from The period : To
! the period l { t5Tusse}s). Brussels. before
| transmitting to Antwerp ~. passed to the
| liege period, so IS to give notice II Is
-enga eed. -At>the end OF the cummunicsi-
/ ton. Brussels warns Liege again 90. ana
( everything returns TO its normal Stlte-
ADVANTAGES IN TINES OF WAR
In ease Of war-and let US hasten to
state that in time Of war wireless telsg-
raphy presents enormous -advantages-the
enemy could succeed by tamperias with
! the accord of the two apParatuses. and At
/ the same time 1t would b. quite pos5iblc
for him to upset the correspondence or 70
intercept a mesS2ge-- By -Tnitki1sS use OF
the, varia BILE accord and by varying the
accord of the two corresponding appara-
fuses in conventional way II would De
impossible for the enemy to arrive at the
| same result as the preceding. because
from the moment ne succeeded IN accord
| ing his apparatus the accord would
i-chanse- an. lie would have II begin
again
( = Us consider now If. one wished TO
| transmit from Brussels at the same time
to Antwerp and Llege and receive from
NamHr and OStend. 1t would then DE
necessary to have in Brussels Two trans
nlitting appaIatuSes and two recefF-
lag -apparatuseS. referring TO what has
been previously said. the two transmit
ting and receiving -apparatuSeS must DE
placed at ii. distance Of 2,opJ IneteIS-Lilal
is to say. the transmltters ar ot- NtlieS
and the receivers at tAockeIDers. II II
!-yyere otherwise. the two tranSmltIerS OF
Brussels would act on the two receivers
of the same locality
THE system which Mr. GuarlpI-eTnDloyS
/ to attain the same end IS based on very
different principle lie surrounds MS
transmitting and receiving t'antenne' by
] metallic sheath having a longitudinal Sllt
The sits of these SfeatflS correspond with
one another in the tVso stations In the
same way that . light shut IN a room
only throws out is rays where IL nnuS Is
she and has its RAYS stopped by walls.
the transmitting antenne, SURROUNDED by
its sheath. only allows its rays 10 inter
through where there ar longitudinal SITS
\ system can thus be conceived That nm
. its the space where the electric radlatl0uS
are sent and even concentrate them. ! ne
receiving feeler only receives rays from
. the side where the slit is opened. radia-
. lions coming from other directions reacn
! the sheath and furrow fntO the ground
This system IS simple and much more
certain than the DroDlenatic one OF syn
.tonization. but 1t Is impractical, or. nearly
so, for motive power or communications
As. per example, between ships ana coast
ships. f II is desired TO communicate
from Brussels simultaneously with Ant
Werp and L-iege. II would be .slInCleIlt 10
lay at Brussels TWO tranSnntterS with an
. tennes and sheaths. The sit IN the Sheat In
Of each tEansTnitter must be respectively
turned toward Antwerp and LieSe- The
space through which the radlationS are
. sent being very limited, it would be al
. most impossible 10 intercept the message
. On the other side. each Transmits SENDS
. radiatiOns exclusively to the station TO
which they are destined. and thus each
/ tCansLnitter would send the telegram TO
It's destination, as ordinary telegraph wire
sends kilograms to the station to which
| they are destined
TRANSMISSION AT SEA
! BY sea. the maximum Of ira nSTnlSsion
I obtained by Narconi was thfrty-tPTo
miles, in 1880. II appears that in recent
/ trials eighty-four miles have been Oh
tanned at sea and II Marconi's hopes
increased by sea and en- level land In
I.el. on land, except by the use of cap
tive balloons or kites, not more than
{ nine miles distance has been obtained
at Berlin with the cieby-ArCO system.
/ We nust not. hoWeYer. allow our mag
/ inati0n a t0O-free fein, as il IS a7ate Ger
! tain that nature -Gi4i- GtEer l-4Aassible
( limit However great, IN TACT. may Dc
the power brought 70 bear AT The trans
I mission station. ane, liable loss OF
! strength occurs or the run of the 'hefJ-
ZIeEle rays, when -EE1Gu the receiver
-eoHsiderab bly, N eake ned These losses are
{ notably the production 81 heat on III
( rays passage through more or less !'e-
[ sisti1E BODIES. IN their successive -deYla-
UI4us ana reflections On IaetatA; SUD
! stances. etc The rays themselves are a
| notable cause Of WetSHe6S- IN the power.
he height Of The antenne, Increased 10y
the distance 10 Re ciessrzd-aLsJ the praC-
/ teal question OF construction and imam
{ ciaI inJeresI-wiii soon oppose any an
| crease OF distance. .AS-SeqJeI 70 the loss
( 5 aboye mentioned the a~TtzielIac rays
fade away at n ccrtIla distance rom the
production station hen, ihe void IS
I round. and the rays spread IN q straight
lime The skeiu of concentrated rays
I must be bent al the cursing OF the eartn
by deviations CT successive reflections,
| and thus the losing game VIII o=glh
1T is thus necessary to have recourse
to other means to solve The problem OF
| wireless teiegraphy at all distances
/ Admitting that 80 miles can be at
tanned BY direct transmission, to compel
| q telegram TO make the world circuit,
[ eighty intermediary posts would be nee
| eSsary the world circumference being
about "A s54 miles II is Indispensable TO
/ have IN the intermediary stations a
Z unique apparatus that can repeat the tel
{ egram at the same time as Il receives II,
his repetition must be made autOnatical-
! ~ 50 as to economic time and personnel,
( Every automatic repeater must be es
seutIaiIy composed Of a receiver and a
( JrauSmitteF Then our Telegram. 10 go
round the world, will not require more
than TWO hours time, the only requisite
delay proceeding from the inertia Of the
different apparatUses-
I Consul Roosevelt adds a supplemental
report on this subject in which ne says:
4 learn that the recent experiment Of
p transmission Of electric rays by relays
: { was completely successful Mr. Guarini
! made his experiments over a much more
- limited distance Friday afternoon. jan
uary % He teIegraphed between Brus-
- sells (colHmn Of cOngreSSl and AIaInes
. tower Of St. Kombant Church, and his
= I experiments were crowned with success.
I Numerous messages were transmitted
: and received with great Gis1inctness and
. two messages were ESceiyed at a time
. when communication Of the transmitter
4 "ith the ground had been interrupted
1t is the first time that messages have
+ heen exchanged between two large cities
with the autenueS placed on high Fn0uu-