The Dolores star., 1918-11-15

as the sport of daredevil fanatics.
1e; at this moment the winged mem
bers of our air cavalry take to the
clouds with the same nonchalance
that the average motOrist tunes up for
trip to the seashore or mountains.
Robbed of its battle dangers aviation
today stands out rs an accomplished
fact, to be negotiated with ease, com
fort and safety. Our boys after the
war will turn their gar ges into han
gnrs. The aerial postman breaking
records today between New York and
Washington is harbinger of the new
era of air transportation.
| So after the war the wireless tele-
phone will be developed as a casual
commercial asset and men will talk
with their business partners in Lon
/ don, Paris and Rome, say the scion
1 fists, just as today they use the tele-
/ phone to communicate with Atlanta
OF Chicago.
! In the army and navy of the United
/ States this fall. radio-telephony is
playing potent part in the business
of winning the war. Thousands of
| young men who go up to the radio
arms of the service are linking togeth-
e. the fighting forces of the nation so
that each and every separate unit is
closely united under a single guild
auce, working cohesively for the one
supreme attainment and at a moments
notice in the most intimate contact
1 with their military directors.
The great problem in radio-tele-
phony at first was the question of
4 sufficient energy control. 1t was nee
essary TO develop transmitting sta
tions capable Of generating high-fre-
quency currents and radiating them so
that the currents induced in the re-
ceivins apparatus when rectified
would cause no disturbing noise in
the telephone receiver. 1t was ueces-
sary also to find the means by which
the amplitude of the high frequency
currents could be controlled and mod
ulntel by the voice so that the ampli-
tude of radiated waves followed close
ly every variation In the voice.
Brought Under Control.
All of these difficulties have been
overcome in the last few years by the
worlds renowned scientists. A sys-
TEN OF control has been built up with
the pliotrOn as its potential pivot so
that the amount of energy in the wire
less telephone transmitter need be no
larger than that commonly used in
standard telephone circuits. 1t has
been found possible to connect up this
radio telephone with the regular tele-
phone lines so that conversation may
be carried out between two people,
both of whom are connected with the
II radio stations by means of the regu-
lar land lines.
Two fields of activity for radio-tel-
ephony opened up with the develop
mert of the first wireless telephone.
The first was for long distance where
wire telephony was impossible over
submarine cables and expensive on
land. The other was for short dis.
tances between ships at sea, and be.
tween land stations.
Atmospheric Conditions.
Transoceanic communication is like.
ly to be developed faster than inland
rhdio-teierhony. 1t was pointed out
some time ago by ]. ]. Carty. the cleo,
trica engineer whose achievement
made possible the first wireless tele
phone messages from New York tC
Pear! Harbor, Hawaii. that transmits
sion across the ocean was easier thu,
across land because there were fewer
atmospheric disturbances.
Overcoming these disturbances i.
the greatest problem we have a
hand" he said I'VE do not know ex
nctly what causes them, but from oul
first experiments we know that the,
, are greater in summer than in winter
so are probably caused by electrical
disturbances in the atmosphere. Theo
retically any number of messages cal
!: be kept separate by tuning the appa