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

! instance, the shoes of the baseball
| PLAYER will, therefore, not. affect the
light sensitive cells and these remain
| inactive. The other parts of his body,
as for instance the white uniform, will
affect only those cells upon which rays
of light from the white fall. These
cells then send their impulses into a
vacuum tube modulatOr and synthetlzer.
This vacuum tube incubator is a regu-
lation radio transmitter such as is used
in all broadcasting stations today
Each photo-electric cell is made to OPP
crate a separate vacuum tube, and
| each of these vacuum tubes sends out
it's own wave. For instance, photo
electric cell No. 1 will send out on a
wave. let us say, of 500 meters; photo
of 5O014s meters; photo-electric cell
No. 3 sends out on a a of 5OO1a
meters, and SO on down the line.
Must Tune Sharply
From the radio transmitter all of
these waves are sent out from n and
the same aerial, which is quite feasible.
for it has been demonstrated years ago
that one aerial can be used to send out
many messages, each on a different
wave length, and there is no trouble in
doing this very thing today. To re-
sumo, what have we done in our trans
mitter? We have transformed light
impulses into electrical ones. These
in urn are being shot into space at
different wave lengths, each retaining
its own identity.
Now let us see what happens at
the receiver. The distant aerial picks
up all the different waves on a reg
ulation radio receiving outfit, which
of course. must be able to tune very
sharply: otherwise. it will not be pos
sible for us to receive a clear picture.
How 1t Is Received
In our television receiving box pro-
per we have the following: There is a
bank of in~ductances with their re-
spective c~ondensers. together called
the wave analyzer. These inductances
and condensers are tuned circuits, and
each picks out its own wav length and
responds. In the circuit of each induct-
ance and condensers we have also an
audio frequency amplifier. which ope-
rates an electromagnetic. similar to a
telephone receiver. This wave analyZer
is already in use today and it is no
a new development at all. Any owner
of a vacuum tube set knows that he
can tune IN or out almost any wave
length that comes along, within reason.
1t is also possible by means of certain
arrangements to let several people
listen in to several broadcasted con-
certs from different stations all on the
same outfit. This already has been
accomplished.
Coming back TO our wave aanlyZer,
let us see what happens now. In
d%uctance number one. condenser num-
Der one, and audio frequency amplifier
number one, are tuned to a wave
length of 800 meters. This circuit.
therefore. will respond only to 500
meters wave length, and to no other
wave. Consequently. when at the dis
tant sender. photo electric cell number
n is ~energized. it sends out a wave
at 500 meters. which wave is received
in our wave analyzer, and will only
affect inductance number one. con-
denser number one and audio frequency
amplifier number one. All the other
inductances, condensers and amplifiers
are not affected because they work ON
different wave lengths.
demonstrating the Picture
We shall now see how the picture
is reconstructed. The electromagnetic
connected with each Of the many audio