Milford chronicle. [volume] (Milford, Del.) 1878-1974, 1902-10-03
wIRElEss releeRAPHY.
One Of the Great Scientific FriumDhs
of the Age.

of the Age.
In nm article in The Saturday Evening
Post on The Past and Future of Tels-
graph and Telephone" Arthur e. Ken
nelly. lately president Of the American
Institute Of Electrical Engineers, has
this to say of the progress in wireless
telegraphy:
In the last few years much attention
has been devoted 20 and much improve
mcnt made in the direction Of wireless
teleginphy. The limits to which this very |
interesting method Of electric signaling |
can be carried have been gradually ex-
tended from few yards up 10 about 100
miles, When two stations arrange to
/ communicate IN this hummer, each erects
/ o long vertical insulated conductor like
flagstaff The sending station operator
connects his vertical wire to powerful
electrical induction coil, by which he is
able to elecirify the vertical wire power
fully In monetary impulses at success
sive intervals. corresponding TO Morse
code signals in ordinary teleEraphy- The
electric impulses communicated to the
vertical wire are projected radially out
ward In all directions over the earth
surface from the wire rs IN axis In
WAVES which are capable OF directly in
1uoncing the sight or other human sense.
II is known. however, that these invis-
ible impulses are practically waves Of
what Is ordinarily called light. except that
whereas light usually consists OF q steady
or continuous train OF waves these inn
Z pulsss are mere mOmentary disturbances
| of isolated groups OF only a few waves.
like those produced on the surface Of wa
I ter IN lake by the fall-of a stone. More
q over, ordinary light IL in waves Of, rough
IL. 100000 to the Inch and has rates OF
vibration to which the eye Is physio
!. logically tuned TO respond. but the waves
i OF wireless telegrnphy are. roughly, sew
= ernl yards long aud have a correspond
It ingly lower rate Of vibration. to whicl
the human eye is insensitive.
The invisible light waves run out owe
|, the surface Of the ground at the SAM
specd as ordinary visible light. abou
1856 miles IN the One-thousandth part Of
% second. and are capable OF acting upo
ID any suitable responsive apparatus q
4 artificial eye that may BE- situnted in an
d direction. north. south. east or wes
10 within the runge from which the respous
- can be obtained. for it is evident that th
impulse becomes scattered aud enfe,
10 ble,l as th, rudius ~ the wave increase
~ lust as tie ever widening circle OF wave
~ I nfOunctu III lDAA " a AulAlLh HAOuG ~
I'll come enfecblrd as the wave advance
be Whrn the wave strikes the fugslulf col
al ductor OF the receiving station. il gr
N crates In that conductor momentai
- electric impulse. which IL capable Of b
ing rendered evident 10 the senses by
no sensitive electric receiver or artificial @.
" connected with il. Consequently by sen
he ing the Impulses at the transmitting st
Ter tinn in Morse code all Of the rccciyil
IA stations within the range Of efiecti
,al working will be- influenced by the inv
lille outgoing light waves and will sp
out the message.
E" The difficulty naturally arises that
ng several itnnHlnitters are simultaneous
nat ut work within each others rudius
emit notion the receivers will be prrplexcd
the their mutual Interference, just as thou
Ike several stones were thrown into 20
ans At different neighhuriug points and
~ rapid succession. Progress is, howev
already bring made in this direction. q
il would seem already possible to ca
Dy particular receiving station 10 respC
to one. aud only one, corresponding So
tful ing stations impulses.