The New York herald., 1922-05-14

length just as the ripples from stone
made on water are of different lengths
measured from peak to peak. Trans
mitters are adjusted to radiate speci-
fed length Of electromagnetic wave and
the receiving instruments are also made
selective, so as to receive as nearly as
possible only the desired wave length.
International regulations govern the
classes of messages are sent.
For example. ship to shore traffic is
generally conducted on 600 meters; the
call for a ship or coastal station is made
on that wave length. If the air is not
congested at that moment the message
is then transmitted on that wave length.
but If it happens that several ships are
working in the vicinity to avoid interfer-
ence the operators, by agreement, shift
to band between 300 meters and 45O
meters or a band of wave lengths above
1900 meters, also designated for this
class of message traffic.
A great number of messages thus can
be transmitted through the air at one
time without causing interference or con-
fusion. The generally used wave length
bands run from 200 meters, used by the
amateurs, up to 10000 meters, employed
by commercial transoceanic stations. Con-
troll of the length of the radiated wave
came in the early stages Of the develop
ment of radio communication and this
feature obviously has contributed largely
to the rapid expansion of the present day
system.
A great network of high power stations
is required to maintain the world wide
system of the Radio Corporation of Amer
lea; powerful transmitters are located in
Massachusetts,, Long, Island, New Jersey,
California and Hawaii. South America
too will soon be adequately provided for,
and already America is conceded the fore
most position in the matter of commercial
radio communication. The correspond
ent stations abroad are located in the i'm
portant communication centers Of Europe,
Hawaii and in japan.
In the accomplishment of the reliable
transocean service which prevails to-day
radio telegrapliy has made some wonder
full strides in technical development. The
old time spark" station has made way
for a newer type transmitting signals
carried on a continuous wave, through
which speed and accuracy have been in
creased and interference reduced to a
minimum. This great improvement is
largely due to the development of the
Alexanderson alternator, a radio fire.
quency machine which gives an output of
200 kilowatts, and which is produced by
the General Electric Company More than
a dozen of these machines have been in
stalled in American stations.
Marked increase in the radiating ef-
ficiency of these transmitting stations
has come too through improved design
and application Of the multiple tuned
antenna. And of equal Importance is the
corresponding development of long dis
tance reception, whereby messages are
now automatically transferred from the
receiving station over land wires direct
to single office, located in the heart of
New York's financial district, there to be
recorded automatically at high speed in
ink on paper tape and transcribed on
message blanks by operators.
BY this method elimination of the hui
man relay at the receiving station has
been effected, an obvious saving in time
and an aid to accuracy. OF still more
recent date is the new method devised by
which two or more radio signals may
simultaneously be transferred to the Gen.
trail operating office over single wire,
and the concurrent development Of de-
vi xut 1; tn rorafuo
signals from four European stations on
one receiving antenna without mutual
interference.
The Radio Corporation of America was
formed as the result of an appeal from
governmental sources calling upon the
patriotism and vision Of the Great elec-
trical industries in the United States to
establish an American owned, operated
and controlled radio communication COM
pany, powerful enough to meet the compe-
tition of the radio interests of other ma
tions and to develop the new art to tue
greatest possible service of the American
people and the American Government.
The supreme inventive genius of the
country, the greatest organizing ability
and the most powerful resources were
placed at the service of the new art, with
the result that radio has made greater
strides in the last two years than it had
in the ten years previously. The Radio
Corporation of America now enjoys the
benefits of the highly developed manufac-
turing and research organizations of the
General Electric Company, American Tel
ephone and Telegraph Company, Western
Electric Company, United Fruit Company,