Evening star., 1924-06-10
ANALYSIS OF TESTS
MADE IN SIGNALING
Thomas Appleby Predicts Use of
Radio Waves Not an
Inch Long.
SAYS X-RAY MAY BE UTILIZED
Experiments Conducted by Army
and Navy and Amateurs.
Special Dispatch to The Star.


PHILADELPHIA June 10.-Predic-
tion that the time is not far distant
when waves less than an inch long
will be used for the transmission of
radio signals, was made today by
Thomas Applchy, president of the
third radio district. in commenting
on the experiments on short waves
now heinc conducted by the Army
Navy and amateur operators.
The shortest wave known at the
present time, said Mr.. Appleby is the
N-raE. He cited an instance show
ing how the N-ray wave could he
used to transmit radio signals
"huring an experiment with an
\-raN tube. Mir tpplrby said lit
was found that the r4diations from
the tub" effected pho ogra phic plates
Two blocks away. If the N-ray waves
'nuid mako an impression on the
photographic plates two blocks away
1t iS poSSihl" that the waves could
travel greater distances than that
'i course. very sensitive d.t~ctor
would have "a he deveiop,-,. for these
short wa'vS. With such . dctectur IL
would he po$Sihl" to u>o the .I-ray
'uh" rs tranSmittrr #nd get the
signals even across the Atlantic
Snort Waves Predicted
som" day all the work in radio
viii pr"'ahl' J." done cn yer, short
waves. according 10 Mr.. ArpIehy. who
;'dd'1: ''Th" n'ld is =: VT un ie-
N"iop"d and il contains ..rcat possi-
hititic$ for several reasons.
IN IN" hrSt place, extremely short
waves CHn he directed in one direr-
he 81,
by them
With given band uf short wave
i,agthS We could operate moe sta
IONS than with long waves For in
stance. between 400 :E1 :5a meters
VIC could not place more thsp j, doyan
stations without causin- some inter
'"rehcc between them. with short
waves, however. say hctwn.n TWENTY
hNe and fifty meters. ecvrra} srstions
could operated between this hand a..
With each other
Short-wavc tctt%' continued NJ
:NpfichH, indicate that There i les
.n,t 'ltrence FRO" static. hoth natura'
'"incS from the atmnSphrr. md nm.
mace static is CauSci hv high no,,ar
!'he' ana SI9rk ng from electric mo
''r< and trolley wires
my "ninIon. the waves of both
I'd uia ara man-made :..f.r arc
AIRY long and broad They arn
nr"ducsd around the brnaicasting
wave lengths. hence tho rra Sor for
INC Intcrtcr"nce when tuning in or
= concert. In TACT. the static wave
Is 50 broad in som" cases it is hc1r,I
on virtually al hroadcas.ir- wave
lengths. ~
Energy Not Absorbed.
lhN snort waves are not hothcrca
:" much WITH this Interference In
''dental!H. The energy raGieted h.
them is not absorbed by ion.. high
power lines ana other bStrt,,.,5or,
which is tho case with Iour waves
iHr cNamplP. take III" pendulum ce
obstruction
II YOU strike The pendulum with :,
hammer u viii require some nf the
energy of tn" hammer II make m.
pfhcuium swing back and forth. Eur
lake lead pencil and lcf-t Donrit
strike it and the PENCIL VIII hardly
mcNN IL becaus" il has not the en-
ercN ot tn" hammer behind it.
IhuS when short waves strike an
ohSiruCtion iil<" trees, for instance
IfSteaG "t the trees (which have
wave length perhaps of 200 TO con
meters ahsorbing some Of the en-
erCT of the waves, the waves mass
right through the trees
The development of short waves
Tor radio work is becoming rapid
Inere was "A time when we believed
VIC could not use anything under 500
meters. Then came the broadcastinc
wave lengths and the amateur wave
lengths OF IJ0 to 200 meters. Re-
Gently ! heard of experiments bein.
made on one meter. Therefore, /
h&IieNe IL Is possible to make use of
long