Idaho County free press. [volume] (Grangeville, Idaho Territory) 1886-current, 1905-08-17
GEO. n. REED, Grangeville, Idaho

evident even when the two cir
cults are separated by great dis.
tances.
Marconi's first trials on a small
scale were made at Bologna. and
these answering his expectations,
he went to England where he sue
ceeded in telegraphing over a dis
lance of two miles. Later he sent
messages across the English channel
thus finally setting up commune
cations with France.
In 1902, powerful wireless teleg-
raphy stations were erected at Cape
Cod, Mass, and Poldhu, England,
and on January 10, 1908, King
Edward and President Roosevelt
exchanged complimentary mes
sages. Since that time thousands
of messages have flashed across
the Atlantic without means of
cable.
Last year the Italian govern
ment asked for an appropriation of
$3.50, 900 to erect under the erec-
ton of Marconi, wireless tele-
graphic stations in Italy and South
America. The distance in this case
will be about 5000 miles, or near
ly one-fourth of the distance around
the world.
! Wireless telegraphy is now
used successfully on ships and they
communicate freely with each other
while moving around, even if many
miles apart. The war vessels OF
the navy are equipped with this
new system of telegraphy.
;. An advantage of wireless teleg-
rsphy over the older system, is its
cheapness, as it does away with ex.
pensive wires and cables. The ap.
paratus used in sending and re-
> ceiving messages is very simple,
| and for use across short distances,
: inexpensive. The machinery must
, be increased in strength, however,
in proportion to the distance. Fol
I sending messages across the ocean,
very strong electric machinery il
4 required. The cost ever then il
comparatively little to that of lay
ing and maintaining an ocear
t cable.
For a long time a great drawback
Q to wireless telegraphy was the fac
that the messages could not be sen
o secretly. Wherever there was
receiving station, the message
a could be taken. When the cleo
e trio spark is produced that sets til
9 air in electrical vibrations tn
waves 60 out in every direction
6 They may be likened to the effec
of throwing a stone into . body Q
water, the waves are propagate
out in circles around the epiceu
y trum, large and strong at first, bu
e gradually becoming less and fainte
y until they are undistinguishablt
1t was therefore possible to inter
lie cept the electric waves in any d
rection. This fault has been ovel
lie come by tuning the instruments
The principle of tuning the r.
ceiving and transmitting apparatr
ID may best be understood by 'refe
ring to musical instrument. Whe
70, the A string Of a guitar is hrougl
to such a tension as to be- in !
proper relative tune with the
rk string, it will sound in unisc
ht with the latter when stoppe'
while the strings not in tune wi
+. give no sound. In like name
q, by carefully tuning the instrumen
lis of wireless telegraphy, only Il
n. receiver in tune with the transmi
v. ter will receive the message. Ma
ty conf says he car tune the instr
ed ments in two hundred and FIJI
as different ways, thereby preventil
the tapping or interception of MI
No. sages.
&C. As yet wireless telegraphy
Ms little used in cities and on Ian
by where countless messages a
er- flashed daily too and fro. 1t
as more adapted for 8 across watt
ID. az the electric waves are not
of this cases detracted by the min
ts. ais of the earth. However,
ed Gently it is being operated succe
on fully on land, but found II
BILE over q low.lying fiat, mars
cal land the signals reached but abb
are two-thirds of the marine distan
her Hills are no obstruction, or, rath
-..~0uly Oork1v an SOmo If tho WA