Radio Age - 1944, January - 36 Pages, 3.3 MB ... - VacuumTubeEra

and most expensive lens which
could be bought.
Thorough analysis of the factors
limiting the brightness of the picture
on the Kinescope, hard work
by a considerable number of physicists
and engineers for some years,
and a number of flashes of inspiration
eventually led to a remarkable
increase in the brightness of the
Kinescope picture. The problem
still was not satisfactorily solved
and there seemed little more to be
gained in the brightness of the
Kinescope picture. The electronics
research men—experts in the field
of electron optics^had long been
unhappy that so little of the light
their projection Kinescopes produced
was gathered and used by the
lens. In the case of an f/1.5 lens
miniature camera fans will know
what that means in optical perfection—less
than 10 per cent of the
light was used; 90 per cent was
wasted
in the rate of development of radio
and electronics. After the war, the
peace-time tasks will not simply be
picked up where they were dropped.
Much has been learned in the war
effort which will contribute to
man's entertainment, comfort, and
safety. Whether or not electronics
will live up to the very rosy predictions
now being made for it is not
for the research man to say. His
field is not prophesy. He has confidence
that the combined efforts of
many research men will solve the
technical problems put before them.
The electron tube research man
expects that he will continue to
have his full share of the work.
Buy War Bonds
Produce New Lens
In spite of the fact that the optical
experts said it was impossible,
the electron optics men set about
the task of producing a better optical
system. Since they could hardly
hope to produce a better conventional
lens than the great optical
companies had produced after many
years of research, what was needed
was a radical idea. Through their
own efforts, they eventually produced
a reflective optical system
with a "speed" of f/0.7 — which
means that it gathers nearly four
times as much light as the best conventional
lens.*
In industrial control and industrial
heating—certainly among the
most important fields of electronics
—there already have been developed
a host of tubes to serve as
tools for a great variety of jobs,
some of them having been borrowed
from radio and many having been
developed for the particular purpose.
Great developments in these
fields will certainly come and it may
be expected that tube engineers will
be called on to contribute their part.
In looking to the future, it seems
reasonable to expect an acceleration
• This development is discussed more fully
Id an article by I. G, MalofT, wliicli will be
found on pag« 25.
":^P%Sl\b^
Tins DISPLAY OF TUBES REPKESKNTS ONLY A FEW OF THE VLTRA-HIGH
FHEQUENCY POWER AND RECEIVING TUBES, CATHODE-RAY AND ELECTRON
MULTIPLIER TUBES DESIGNED BY RCA RESEARCH .MEN.
[12 RADIO age;