Democratic messenger. [volume] (Snow Hill, Md.) 1869-1973, 1922-08-05

nnnu, strikes the moor. among All tne
Interesting phases of the electric art,
none is more fascinating and technical
and complex than the art of radio
communication.
Prospects Almost Unlimited.
at was Sir Oliver Lodge who said,
following Marconi's initial experiments
In wireless, that the day would come
when Il man in New York or London
would be able to call to his friend in
Tokyo Alaska. Russia. South Africa
or in amy other part of the world. and
If the friend did not answer he would
know that his friend was dead. That
was II very broad statement. but 1t
may he true.
Most people seldom consider the
lack of progress made in the commune
cation of intelligence between distant
points. for thousands and thousands Of
years. and what strides have been
made within the memory of men and
women now living. Not until 1874,
when Morse. surrounded by a curious,
skeptical company. received over
telegraph wire the famous message:
What hath God wrought did the
world obtain any means Of quicker
communication.
''ln 1876 Dr Alexander Bell showed
the world how 10 talk over a wire along
which IN electric current was passing
by impresSing on that current varia-
tions corresponding To the sound waves
In
followed by a host of improvcrS. so
that to-day conversation Is possible
over wires between almost every point
in any one of the civilized countries of
the world
"A Spanish scientist. Saliva of Bar
celona. i25 years ago signalcd across
water by making the water conduct the
current. Professor Morse. before he
completed his telegraph. conducted ex-
pcrinents along the canal above
Georgetown. u. g.. and succeeded in
signaling without wires across the ca
nal 10y making the water conduct the
current Efforts To signal between
ships IN this way were tried by Dr.
Bell in 1S>2. and he succeeded in sig
mailing without wires between vessels
II mile and n quarter apart. 4 Profess
sor Hughes Of London in 1878 had a
device with which he signaled II dis
lance by means OF what we now know
to have been true wireless or electro
magnetic waves. But he had never
heard of wireless waves and his Scicn-
iiiic friends did not think what he did
amounted To much. 80 Hughes gave
II up.
"If we would appreciate the fire and
the sun we must look nj III" fire first,
So in this matter of Wireless. having
first looked ~ the previous efforts to
signal without wires. we now look Mt
The wnndrolS discovery of clcctro-mag-
nclic wave transmission. Tile Simile
Is not napt when we recall that the
rays Of light. those of radiant heat.
and the licrtZian waves from the trans
hitting apicnuac Of q wireless set are
all electro magnetic waves differing
only III their length, and. of course, In
the frequency with which they are
emitted ar given OF. They all travel
at the same Spccd. $4,000 miles Il sec
ond. aud can be reflected and rrfractcd.
Marconi Is Pioneer.
at was in IS9G that Marconi, who
had been Experimenting with great
skill and patience. on his fathers farm
81 Italy. succeeded in signaling with.
out wires for Il distance of 100 yards.
Dn" year later he Sisnalcd nine miles
and in two months Increased the dis
lance t. T. miles. In July. 1895. he
signalcd ~ miles and in 1901 his sig.
nal crossed the Atlantic ocean.
As j. usually the ease whenever II
great ionecr invention is made, the
success of Marcnni caused host Of
inventocs and impr"vcrs. including
some Of the greatest electricians the
world Las known. 10 take up the sub
icct from every angle and viewpoint.
The al parntuS that Marconi used is
now - only historical interest. A
modern wireless set comprises nothing
I similar to whist he used or all the
change. that have been made. the new
things that the brightest geniuSeS OF
! the world have been able TO produce.
/ the one that SURPRISES all. and that
/ makes modern wireless telephony and
4 tcl".rnphy what il is today. Is the
/ ihrrmit mic device which is detector
/ Of the waves. nm umplticr of their fee.
+ bile energy. and generator of the
oscilat ny currents necessary for send
/ ing Tho message
Some wires. generally three IN mum.
her. run parallel "a each other and
supported nn poles or housetop.
which we call auicnnac-from tho
analogy 10 the fc"irrS Of an insect like
hug ar cricket constitute the feel
crS thu catch the energy of the swift
~ pas, ius waves. This energy sets
M snail. feeble currents in this won-
derfu little thcrinionic detector. and
with telephone receiver the operator
can listen to the message.
"'rhe antennae wires. an induction
coil. tuning coil and condenser. a
small source Of electric current and
this thermionic dctcctor constitute.
with II telephone receiver, all that j.