Evening star. [volume] (Washington, D.C.) 1854-1972, 1925-09-27
EXHIBITS TO SHOW
GROWTH OF RADIO
Earliest instruments and
Their Development to Be
Feature of Exhibition Here.

A huge educational display brought
to Washington by the Radio Corpora
ton of America will be one OF the
salient features of the second annual
radio show, which will open tomor-
row at the Washington Auditorium.
Old-time radio receivers. from the
first device made in 1901 down TO the
latest receiving sets Will be shown In
this exhibition. which has been
cleaned from the storerooms of the
United States Navy, The Radio Corpo-
ration and many radio concerns now
out of business. DetectorS, wave
meters, transmitters are shown in
early forms, proving that radio is far
from being in its infancy.
The first commercial use OF this new
art is in marine operation. In "a spe-
cial section of the show may be seen
a complete marine transnitter, as well
as the radiocompass, "the eyes OF the
Ship" Near it will be seen a working
model Of the higia-speed sending and
receiving apparatus of the RCA trans
ocea mic service. Here the visitor VIII
see the message punched out on a
tape, and run through the automatic
transmitter at 4 speed of one hundred
words a minute, finally being received
by a. nervous fountain pen on the
undulator.
Factory Details Explained.
Coming to commercial development
of today, a welder for welding in place
the filaments, plates and grids OF
tubes will be in operation several
times a day. A lecture telling the
features of tube manufacture and OPP
Grafton will be given at this time.
Still more indicative of the present
is the broadcasting station A 1oo-
watt continuous wave tranSlnltter Is
used. this having been licensed by the
Department of Commerce under lne
call letters WE'LL. We Entertain
Broadcast Listeners, it might mean.
The plate current is delivered from
storage batteries. making the opeTa.
ton Of the tranSmitter eSpeciaiiy
smooth. The wave length used Is
oo6 meters. In some tests or the last
wear. this station was heard over
thousand miles at night. and hence
il Is expected that many thousan mas
will be able to hear it In its teadins
location. a regular radio program
will be put on at the radio show. Inc
best local talent has volunteered It's
services for this feature.
Two Of the very latest develop
ments In the radio art form, however
the spectacular side Of the radio ex'
position, First OF these is the Hewlett
loud speaker, giant AFFAIR, "hici,
has been heard at a distance or !
miles. Notwithstanding this enor
NOUS amplification. more than NIL
lion times. the resultant speech OF
music is absolutely as pure ana ols
tinct as the original.
Send Photos Through Air.
The second feature Is the photo
radio exhibit. or photograph by radio
Several times daily pictures viii act
ualIy be transmitted by the 1Oo-wat'
transmitter of the broadcasttng sta
ton. and received before the eyes OF
the public at the other end OF the
tent. This spectacular feature Is pre-
sented for the first time. no demon
stration having ever been publicly
given OF this before. Capt. Ranger
inventor OF the system, will supervise
the installation.
The show is in charge Of G. II.
Clark, one Of the oldest men IN radio
Mr.. Clark was for eleven years chief
radio aid for the Navy Department,
and hence Is especially fitted to speak
of the various steps in the develop
ment Of radio. For five years Mr..
Clark has been with the Radio Cor.
poration OF America, as manager OF
shows and exhibits.