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Radio News for November, 1928
491
A series of eight 48 -line images per second
is built up, in the Pilot system. Although
it has been generally thought that
at least twelve are necessary to create the
effect of "moving pictures," this slower rate
produces the illusion very successfully. As
long as the subject does not move back and
forth too quickly, his movements are reproduced
smoothly and with a barely perceptible
jerk. The images certainly will.
satisfy the radio experimenters, for whose -
sole benefit the broadcasting is done.
IMPROVEMENTS UNDER WAY
As this issue of RADIO NEWS goes to press,
Mr. Geloso has not quite finished his automatic
synchronising system, so this will be
described in the next number.
Briefly, his arrangement involves the
transmission of a single strong impulse, at
the end of each rotation of the transmitter's
scanning disc. In the receiver, this impulse
will kick over a relay in the plate circuit of
the last audio-amplifier tube and this relay,
in turn, causes a magnetic device either to
accelerate or to retard the receiver's scanning
disc. With one stabilizing impulse every
revolution, the disc will settle down to perfect
synchronism with the transmitting disc;
so that the received images will remain automatically
"in frame." Without some such
means of synchronization, and with only a
variable -speed control on the scanning disc,
the images have a tendency to wander out
of view. For further discussion of receiver
problems, see the article on page 422 of this
number.
' It must he understood that television today
is only for the experimenter, who will
find it more entrancing as a scientific hobby
than radio broadcasting itself. Complete,
foolproof television receivers for the public
will not be ready for a long time but, meanwhile,
the home experimenter can contribute
as much to the art of television as he did to
the art of broadcasting in the early days,
from 1921 to 1924.
The true television broadcasting being
dune with the Pilot televisor, through
WRNY and W2XAL, must he distinguished
from the "radio movies" being transmitted
by C. Francis Jenkins and also the "radio
movies" recently demonstrated by the Westinghouse
Company, described elsewhere in
these pages. In the latter forms of broadcasting
the pictures on a roll of motion -
picture film are transmitted, not the images
of a living person. Radio movies, however,
offer also an extremely interesting field and,
fortunately, the owner Of a 48 -hole television
apparatus can reproduce the ,Jenkins
pictures also.
John Geloso, the chief engineer of the
Pilot Electric Manufacturing Company, and
the man responsible for the design, construction
and successful operation of the
Pilot -WRNY television apparatus, is only
twenty -eight years old and has been in the
United States only four years. He was born
in South America, but has spent most of
his life in Italy; is a graduate of the University
of Genoa, where he studied electrical,
mechanical and naval engineering and,
before coming to the United States, he followed
the profession of a naval engineer.
Mr. Geloso has been with the Pilot company
for the past three years; and five
months ago he was assigned by Mr. I. Goldberg,
president of the company, the staggering
task of designing a practicable television
transmitter that would stay within
5,000 cycles. Within five [hays from the time
Television-
Jules Verne, in his famous "Twenty
Thousand Leagues Under the Sea,"
written in 1870, accurately predicted
television. Captain Nemo, the mysterious
owner of the great submarine,
had worked out the scientific application
of seeing at a distance.
Many years have passed since the
novelist's prophesy. All that time
scientists and inventors have been
striving to make television a reality.
Every now and then for the last two or
three years you have probably met
some one who had a friend who had
witnessed television. Somehow or other
you never saw the witness himself.
The information was always secondhand.
Now we have advanced. Television is
being accomplished. You may have
At First Hand
seen it yourself and experienced the
tremendous thrill which comes from
seeing a weaving pattern of luminous
spots of light shift and whirl, then suddenly,
as the revolving disk reaches the
proper speed, resolve themselves into a
clearly defined moving image which can
be recognized by everyone. This modern
miracle makes you think of nothing
so much as a great Genie of the Arabian
Nights forming itself out of a cloud of
smoke from a jar, just opened.
First -hand television is here and
available to all.
National Company, Inc., has developed
new and better equipment for the construction
of short -wave receivers and
audio amplifiers of the type required
for successful, experimental television
reception. Write today for Bulletin
No. 128 -R. F.
TIONAL
NI z
RADIO PRODUCTS
NATIONAL CO INC w A READY Pets MALDEN MASS
Improves any set.
Easy to install.
Neat, compact, durable.
Moderate in price.
"The Perfect Contact Radio Ground"
Patent Applied For
PER -CON MFG. CO.
Richmond, Indiana
SUPER -DAMOHM
(ACTUAL,SaZE)
SOO to 5,000.000 ohms
distributed capacity and indue :wee practically
most accurate
negligible.
and
The
emcient resistance
Irrite
unit
for
known to radio.
book'eI D. DAVEN CORPORATION. Newark, N.J.
Please say you saw it in RADIO NEWS
Radio has been changing sofast
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CaCAGO.
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