The Wichita daily eagle. [volume] (Wichita, Kan.) 1890-1906, 1899-04-07

London, April Professor Marconi to-
day furnished the London correspondent
OF the Journal with a minute description
of the apparatus with which he has
brought wireless telegraphy to such a high
pitch of practicability.
For long distances" he said, when it
is not necessary that signals should be
sent in any particular direction, my trans
mitter is furnished with two small spheres,
which are attached to the terminals of the
secondary winding of an indiction coil.
They are connected, one with the earth
and theother with virtical conductor,
which I will call the arial conductor.
''When the key ia pressed the current
Of the battery is allowed TO actuate the
spark coil, which charges the spheres of
the Right oecillatcr one, and the system
of spheres and insulated conductor be-
comes a radiator of electric waves. 1t is
easy to understand how by pressing the
key for long or short intervals it is pos
sible to emit corresponding long or short
succession Of waves, which when they
influence the receiver reproduce on it a
long or short effect according to ,-.e.r
duration.
'One Of the principle parts of my re-
ceiver is the sensitive tube or coherer
The only form of coherer have foun- to
be trustworthy for long distance work is
one designed by myself. 1t consists of a
small glass tube into which two metal
pole peices are tightly fitted. They are sep
Grated by a small gap. which is partly
filled with a mixture OF silver and nickel
filings.
"This Cohecer forms part Of the circuit
containing the local cell and a sensitive
telegraph relay, actuating another circuit
which works trembIer, or decoherer, and
a recording instrument.
In its norman condition. the resistance
but when they are influenced by electric
waves surEings. cohesion takes place and
the tube becomes comparatively good con-
ductor. This allows the current from The
local eel to actuate the relay. one end of
the tube is connected TO the earth and the
other TO a vertical conductor similar TO
that of the transmitter: or if rehectors
are used a short strip of copper is connect
ed to each end. The length Of these strips
of copper must lie carefully determined
in order that -hzy may in time or syntony.
with the transmitting oscillations
Il find that the relay Taper, If not prop
erly shunted by non-inducJive resistances
VIII produce disturbing effects. the result
Of which is 10 prevent the coherer from
resa.ung its sensitive condition after the
The receipt Of oscillations Between the
coherer and the relay small choking coils
are introduced. They compel the osc-.la--
ing current 10 traverse the coherer rather
tlau waste lis energy in the alternative
path afforded by the relay. The oscilla-
tEoas induced on the trips which act as
re-onator frec. jhe sensitive -Ube. in
crcas.ug lis condugtiviJy and thus COM
p,eg ns the circuit an allowing the current
from the ceI Re sctUate the relay. This
IN is -uru causes a larger battery 10 pass
a current through the Taper. or inter
rupter. an also through -he e,sctro- mag
nets OF tIe recorns instrument. The tap
yer is 50 adjusted as TO snake ;he filings
in The tuba.
TX liz the Instant during Which thesa
various actions take place tae electrical
oscillations die our in the resonaso- the
tap given 10 the tube 1y the hammer
would restore It 10 lis norma high resis-
lance condition, and tae Morse ins-ru-
men, would mark Of dc. GA the tape
bus II yle oscillations cont uue az very
brief Intervals they acquired CordEctlvi,y
os the tube is destroyed only for an in
SIAN: ana IS Immediately rees5a5lished.
which oree more aetua.es the relay tap
Per and telegraph Instrument. The prac-
teal result = that Ihc receiver Is sctua-ed
Tor q time equal n fhar during x1Te7 --a
key i pressed at jhe 1r-lnsn2lt ting station
The immature Of the Morse recording IN
sirument oe.as rather heavy, It cannot