Great Falls tribune. [volume] (Great Falls, Mont.) 1921-current, 1922-09-03

frequency amplifiers are equipped with
pivoted diaphragms in the center Of
which are mounted vertical strips of
mirror, which are very narrow. These
mirrors may be 1-16 of an inch wide
or thereabouts. The best width will
probably be found by experimenting.
From a common source of light also
shown in our illustration a single ray
of light falls outside of each mirror.
See diagram. The comnon source of
light may be a powerful tungsten lamp
many holes. Each hole let's a ray of
light pass and each hole sends a ray
of light upon a different diaphgram.
The instant the audio frequency
amplifier energies the electromagnetic
the diaphgram in front of it begins to
turn on it's axis, and the ray of light
} normally at rest begins to vibrate back
and forth. This ray of light falls upon
a ground glass plate in the rear of
the receiver.
At this point, we wish to call the
| readers attention to the fact that the
diaphragm in front of the electro-mag-
net is not the ordinary telephone dia-
phragm but is one that is pivoted. In
other words, the more current flows
in the electro-magnet, the more the
diaphragm will turn. Of course, this
diaphragm is attached in such a man
ner that it will not turn through a
great angle. A small fraction of a de-
gree is sufficient. 1t can be readily
understood that we have here to do
with a lever action, and if the mirror
turns only a minute angular measure
ment or less, the beam of light that
lays On the ground glass will move
quite q distance.
Mirror Vibration
If the diaphragm vibrates violently,
the flat pencil of light will illuminate
a square upon the screen which is pre-
determined by experimentation. IL the
diaphragm does not vibrate at all, the
light pencil is not visible at all, be-
cause. as We stated before, the light
ray can only be reflected when the mar
row mirror begins to vibrate. At rest
there can be ne reflection of the light
ray, because the latter does then not
fall upon the mirror at all. The more
the mirror vibrates, the wider the light
band becomes, as is shown in our sep
Iarate insert illustration. In other words.
If at the sender photo-electric cell
No. L is fully Illuminated, it will SEND
out a strong impulse, which strong i'm
pulse is received at the receiving end
exactly as if at the present time a
broadcasting station was sending out n
loud note. you would hear 1t in the
Telephone receiver loud. If it was send
ing a weak note. you would receive it
weak in the phones. as well. Just so
in the authors television scheme. The
more light there falls upon the photo
electric cells. the more the tiny mirror
in front of the receiver electro-magnet
will swing back and forth. Therefore.
the entire imaginary small square upon
the ground glass will be illuminated.
If, on the other hand, a black object
falls upon the photO-electric cell num-
Der one it will not send out an i'm
pulse and for that reason the electro
magnet number n at the receiver
will not energize the tiny mirror md.
consequently, the square of the unit
number one On the ground glass will
this that u shade from either
darkest black to highest white will be
transmitted inst%antaneously.
The entire picture is made I'D hy
such impulses and is thus recon
structed upon the screen where we
can view any picture, whether it be at
rest or animated. In other words.
it makes nc difference, if we turn the
sender on a scene that is at rest. or
whether we turn II al n horse race:
the effect will be of the same degree
of perfection.
Exists Only In Theory
There is no doubt that this scheme
can be made to work, and we would
be very much surprised if television
by radio were not an accomplished
fact during the next two or three
years. The author wishes it dis
tinctly understood that the propo-
sition has not been worked out and
exists only in theory so far. but there
is no point in it which is not sound, !
and which cannot be turned into prac-
tice today. 1t simply is a matter of
building the device, and making such
minor improvements as would be
found necessary in actual practice. 1t
should also be understood that this
idea is not only applicable to radio.
but it is possible to use the same
instruments on wire lines with equal
facility.
This television scheme would then
resolve itself into wired wireless with
which we are all familiar. One may
ask if the voice currents and the
radio currents will not mix up and dis
tort the picture at the other end, or