Evening star., 1924-03-18

it's will surround the Radio Corpora
tion's costly educational exposition.
All will be centered at the south end
of Convention Hall. On the lower
floor will be a midway, featuring a
city games.
Let's peep into Convention Hall
day in advance of the opening. Car
for the big event. They have been
working day and night since Sunday
erecting booths, installing lights and
arranging the exhibits.
We pass the long line of booths
displaying every conceivable sort Of
radio apparatus and accessories and
finally come to the educational ex-
hibits at the south end of the hall.
one. and is divided into various
groups. in each of which the actual
apparatus used in the various
branches of radio work is shown.
Historical Section.
First is the historical section. The
message gained from this is that
radio is not in its infancy. $50 many
people believe that radio was in
vented two years ago, when broad
casting was begun. Radio is a lusty
youth who has been able to vote for
five years.) The first set installed
on shipboard in 1900 is shown here,
with the united wireless sets of 1905,
old time keys. wave meters and other
antiques. Insulators of all kinds,
ones. are on display. including the
tarred-rope type, that only an engi-
neer would regard as an insulator,
and the huge four-foot porcelain rods
OF vol
central in New York. In the receiv-
ing section the visitor notes the in
genuity of radio designers who have
made so many different outward
forms for the designers, namely, a
device for charging inductance or
capacity. or both, i. e., receiver.
Ultimately detectors from the CO.
herer Of 1898 to the present day are
on display.
Passing now to the marine section,
complete ships cabin greets the
eye, including even the big ships
clock. The transmitter and receiver
which are furnished with modern
ship installations are shown. This
models of the radio compass-that
great aid to modern navigation-and
its operation will be carefully ex-
planned at every lecture. A novel
type Of Transmitting; antenna is on
exhibition, consisting of one wire of
large diameter instead of the usual
multi-wire antenna SO familiar on
shipboard.
Tralsoceanic Section
In the transoceanic section the
worldwide wireless chain Of the Ra-
dio Corporation of America and it's
affiliated companies is displayed. link
ing North America with her eastern
ancestor, her southern sister and her
western cousin. This is brought out
by a huge map, in which many COL
ored lights wink in and out as the
series. Here, too, we see the United
States Army and Navy chain Of radio
stations and the marine stations of
the Radio Corporation Of America A
relief map, just received in this
country from the international expo
sition at Sweden, shows radio central
and the associated high-powered sta
tions OF the radio corporation at Port
Jefferson, n. Y. But more human
touch is given the demonstration of
the high-speed sending and receiving
apparatus used at all, high-powered
stations by the perforating of the
message on a tape, the sending of
this via the automatic transmitter
matte reception by the undulator or
tape recorder at the other end of tho
radio circuit
Radio is much used in government
work, both in military and non-mili-
tary functions. In Washington espe-
cially this feature is of prime impor-
tance, and thus it is that the educa-
ttonal show has as its chief. perhaps
its dominating, section-a display by
tho various departments of how radio
is used by them.
Complete Signal Corps Display.
The Army, represented by the Sig
nal Corps, has a complete display,
ranging from the old-time vacuum
tubes to the latest type Of loop trans
mitter and receiver and the newest
vacuum tube sets. Old-time appara-
tus temporarily taken from the Army
exhibit at the Smithsonian Institute,
will interest every one. Not little
interest will center about the German
buxzer transmitter, captured at Cha
teau- -Thierry by American doughboys
under the leadership Of Gen. James G.
The Navy has complete display,
present. One Of the pack sets Of sew
eral years ago is shown, with its
complicated wave changer and it's
break-key-not by any means obso-
lete today, but perhaps even q little
in advance OF modern practice. An
old-time receiver, developed at the
navy yard by Lieut..
Eaton and DE. L0lis Cohen y shown