Smyrna times., 1940-07-18
NEW DEVICES AT
PHONE EXHIBIT
Diamond State Telephone Co.
To Show Latest Features
Developed by Engineers
TO SHOW FILM SLIDES

Some of the marvels developed
by telephone engineers will be
demonstrated at the Diamond
State Telephone Company's exhibit
at the Kent and Sussex Fair, Har-
rington, opening July p. Accord
ing to c. Burton Sypherd, manager
for the telephone company, the
visitor will be able to hear his own
telephone voice as others hear it.
He can, by another device, test his
own use of the telephone so that
if he directs his voice correctly
into the transmitter a green light
flashes. But if he doesn't, a red
light glows. At another display
he can see his own voice as a de-
vice changes the voice sound waves
instantly into light waves visible
on screen. These and other fea-
lures, including an exhibit showing
how dial telephone works, will be
under the telephone company's
big top" a tent 40 by so feet, To-
Gated on the main avenue leading
to the fair grounds grandstand.
And on another avenue within the
fair grounds, parked near the
grandstand entrance and making
its first appearance in Delaware,
will be the company's newest tele-
phone facility big, streamlined
trailer with four soundproof tele-
phone booths. The telephone will
be ready for service as a public
convenience, available either for
local or long distance calls. The
trailer, whose public telephones can
be connected quickly to any tele-
phone lines, was built and equipped
for two purposes. One is to sup
ply public telephone service where
crowds assemble at a point having
no convenient public telephones.
The other purpose is for service in
emergencies. such as big fire,
flood or disaster where existing
telephone facilities may be dam
aged or temporarily unavailable or
where supplemental lines of COM
munication are needed. Visitors
will be welcomed to the trailer and
may inspect the booths. see the at
tendant's desk with its switching
keys, and lock over the displays in
the trailer's waiting room. In the
telephone company's tent, near the
entrance, will be the voice mirror
which reproduces the users voice.
In nearby corners will be the voice
meter which gives the user a green
or red light, and "Annabelle," a
life-size model of a girl who
"hears," through hidden micro
phones, whatever is said by Wis
itor at this display Then, on
screen above the figures head, APP
pears the incredibly swift, fiuctu-
ating line composed of light waves
transformed from sound waves.
At one side of the tent will be
a cable plow which places tele-
phone wires underground to a max
imum depth of 18 inches. This in
vention has facilitated the work of
burying telephone wire so that it
will be free from the hazards of
sleet and high winds. In corner
of the tent will be a telephone in
staller-repairman's truck, a little
warehouse on wheels. There, each
in its designated location, will be
an array of tools and equipment,
from tiny screws and staples up to
big coils of wire In a corner op-
posite will be a dial demonstration
unit, with two telephones, and the
mechanical equipment necessary to
complete a dial call. The visitor,
using one of the telephones, will be
able to dial the number of the
other instrument, watch the dial
mechanisms speed his call through
the exchange" in couple of sec