Evening star., 1922-12-24

the battle front. and view motion pic
lures Of the conflict as it ragged. Simi-
larly the Secretary of the Navy may
sit in his Office at Washington and
watch the progress of naval battle.
Movies by radio In the home will
soon be an accomplished fact. start
ling as this may seem. for the only
unsolved problem is the speed factor.
Nr Jenkins told a reporter for The
Star this week.
when, then. this remaining prob
lem of speed is solved. and 1t is now
being worked out gratifyingly. per-
sons in California or Nebraska or
Maine or Florida will be able to see
the inaugural ceremonies Of their
President in the National Capital on
the day Of Inauguration. or both see
and hear grand opera broadcast from
any point" he continued in tone
that bespoke confidence.
Meantime, while this problem is
being worked out photographs by
radio wilt be put into useful service.
for the distribution of pictured news
for the daily paper. the news bulletin.
the theater and all other subscribers
to such service"
The system by which the Washing
ton inventor has harnessed Hertzian
waves for transmission of pictures Is
not so complicated or expensive as Its
importance would seem to demand 1t
to be- In fact. it is. after all. SO
simple that one wonders why 1t was
not thought of before. The equip
ment necessary. II is true. must De
specially manufactured. but with the
completion by Mr.. Jenkins of the ma
chtnery required to produce it. repro
duction of any number of the trans
hitting and receiving sets is only
matter of routine production. The
remarkable part of the invention is
that it may be attached to the ordi-
nary sending and receiving radio out
fits already in use at an expense OF
$50 to $3.50.
The process consists. briefly. IN
"slicing" the photograph to be broad
cast into hundreds of perpendicular
sections, each about 1.5OOth or an
inch thick, and In moving the prof.
ected image of each section across
a so-called photo-electrical cell, made
OF .selenfum, or similar mineral
whose ability to carry an electric
current varies with the intensity OF
light falling upon it. As each section
of the Illuminated image is thus
drawn at moderate rate of speed
across the cell, the dark portions.
half-tones and light spots formed
along the Slice" by the shadows.
lights and color variations Of the
Photographic plate serve to cor
respondingly decrease. increase or
maintain the flow of electric current
through the cell.
= K i: ::
IIAF1SG thus TRANSFORMED light
i i variations into electric current
variations, it was simple matter to
substitute this instrument for the
microphone mouthpiece of the radio
phone, for the function of the micro
phone Is similar to transform sound
variations into current variations.
To reproduce the picture at the
receiving station a virtual reversal
of the sending process occurs. Two
methods have been successfully en-
ployed. By the first method. the
wireless waves are received over
regular radio receiving set. the re-
coiyer of which. however, is equipped
as follows:
On the metal diaphragm of the re-
ceiver is, mounted a tiny mirror.
which vibrates with the diaphragm
as the radio oscillations are regis
tered. Focused on the mirror is a
strong ray Of light, which is reflected
through shutter when the mirror IS
stationary. AS the impulses origtnat-
ing from the sending station start. the