The Rock Island Argus and daily union. (Rock Island, Ill.) 1920-1923, 1922-08-12
EDlO HISTORY
outline FROM
1888 TO 1922
~ Radio Brpadcastlng Began
= 1Se2; Edissn's Invention
Is Valuable.

4MD4reQ ny -. ~. We8uueE, u the
ssserai Electric company, IN
srhneetady, N. Y. The events be-
dsning in 1883 follows:
f1Ss-Thomas A. Edison discov-
= what is now-called the Edison
meet" a phenomenon occurring
= I burning incandescent electric
SuI6. In that an electric current
- be made to pass through space
srem the burning filament to an add
acept cold metallic plate. While
nj applied to radio at this early
daie the discovery was later used
"a developing the vacuum tube,
now veritable modern Aladdin's
lamp and the very heart Of radio
communication. y
lSS5-E.ect.i signalling through
he air without connecting wires
started when an English expert
meut restricted two lengths OF
wire one-quarter mile apart and
by charging one with local cleo
tric current is able to induce re-
yponse in the distant wire.
l1S87-Professo Heinrich Hertz,
. German scientist, proves expert
mentally that electric waves are
sent through space with the speed
Of light by the electric discharge
that takes place when spark is
made by an induction coil or a
static machine. These waves have
since been called "Hertzian Waves. +"
1S90-Prof. E. Brandy of Paris
develops the coherer which con-
siderably improves reception.
1894 - British experimenters
bridge a distance Of IA miles by
means of Improvements on the
original induction system Of 1885.
1S95-Guglielmo Marconi proves
that electric waves can be trans
mitted through the earth, air or
water by means of sparks produc-
ing high frequency electrical oscll-
lations.
1S96-Marconi further proves
that telegraph signals can be sent
and RECEIVED by means of the now
famous Hertzian waves up to dis.
lance of three miles.
4. 1904. F.. Collins bridges dis.
tances up to eight miles by means
of his. so-called electro static sys,
tenn Of wireless signalling.
1901-Marconi, spurred by his
early successes, finally succeeds in
bridging the Atlantic ocean from
Poldhu, Cornwall, England, to st
Johns, New Foundland, by sending
the historical series of the letter
49," the distance being 1900 miles
l9O2-Prof. E. Runners photo
phone system of wireless covers d
distance of 20 miles at Kiel, Ger.
many.
: Wireless telegraphy :;
adopted on large transatlantic
passenger vessels. the test being OIL
the American S. s. Philadelphia.
l9O2-Prof. J. A. Fyeming, D
London, England, invites the two
element thermionic valve detectol
for radio reception.
1906-~Prog. r. A. Fessenden, al
American experimenter, develops {
high frequency alternator system
having a range of 20 miles.
19O6-The Telefunken arc system
Of wireless telegraphy is developed
and covers distance of Is miles.
1906-Dr. Lee De Forest, al
American radio expert, improve!
the Fleming original vacuum tube
by inserting the third or cOntrc
element, known as the grid.
l90S-Prof. Poulsen ,perfects an
other arc transmitting system
which covers more than $50 miles
On first test.
1908 - Marconi transatlantic
radio stations are opened to tn
general public for the transmissio.
and reception of radiograms be
tween Great Britain and Canada.
19OS-Prof. Marjorana perfect
an arc oscillating generator AM
liquid microphOne system ant
bridges Rome with Sicily, dis
lance Of 800 miles.
1911-The radio telephone cover
a range of $50 miles betweel
Nauen, Germany, and Vienna, Aus
tria.
l9l2-The International Radi
Geographic conference approve
Regulations to secure uniformity O
practice in radio services.
lSl2-E. H. Armstrong, an Amer
lean, invents the now famous re
eenerative vacuum tube circui
while experimenting, at Columbi
university.
lsl3-The powerful radio sta
uoh at Nauen, Germany, success
iuiiy bridges a practical telegraph
ing distance of 1850 miles.
lsl4-Laws are formulated b.
foremost maritime nations requir
ing that vessels Of certain size
and grades carry wireless equip
ment and operators.
l9l4-The Marconi Wireless Tele
sraph company of America inaugu
rates new American trans-oceal
wireless service by opening it
Vaiifornia- Honolulu circuit.
lsl5-The American Telephon
ana Telegraph company, workin
~ conjunction with the Wester
Electric company, succeeds in te!o
pnoning by radio from Washingto
70 Paris, a distance Of $500 mile.
sna from Washington to Hawaii,
Instance Of 5000 miles.
l9l6-Presidento Wilson an
Mikado OF Japan exchange radio
grams at opening of newly estat
nshes trans-Paciflc radio servic
Setween the United States an
Japan.
lsl7-Dr. Z. F. w. Alexandersoi
consulting engineer Of the Geners
nIectric company, develops %
khowatt high frequency alternate
now used almost exclusively
lion.