The Bryan daily eagle. (Bryan, Tex.) 1895-1898, 1898-05-17

ent from what II would be II the Sc
lenium were to be placed In blue light.
This very sensitive characteristic Of Sc
lenlum is taken advantage Of to trans
NIT pictures by wire. The dots OF
light. which really form the image to
be transmitted. are allowed 10 play
through a narrow slit In the partition
against the selenium cell In the top Of
the box. Tho sclenlum Is part OF the
circuit or wire through which the pie
ture Is to be transmitted. This circuit
may. for all practical purposes. be
hundreds Of miles long An electric
current Is made TO Tow through H.
and. consequently. through the seleni-
um. Now the reflection Of the man
outside the box. with all the eolors OF
the costume. Is being projected con
stantly against the selenium In the top
OF the box. and this rapid interchange
OF color Is causing the electric current
which flows through the selenlum to
vary constantly In strength as the diff
ferent colors In the reflection affect the
resistance Of the selenium. II there
fore follows that an electric current Is
easily obtained. the strength OF which
depends entirely on the nature Of the
color which Is projected against the Sc
lenlum. The transmission OF colors.
or at least the transmission Of their
equivalent in electric currents. Is what
has been accomplished.
Having accomplished the feat OF
sending cOlors. OF their equivalents. by
telegraph II now became necessary TO
separate the various parts or intensl-
ties OF this varying current. and 10 re-
solve them into colors again at the
other end Of the line. In short. just
as the selenlum was able to change
colors into their equivalents In current.
popularity speaking. so must some
method be found Of changing these
currents back into their equivalent col
ors, II was done In the following man
ner: The line which transmitted all Of
these varying currents ended In the re-
ceycr In a coil which formed an cleo
tro-magnet. When the selenum al
lowed heavy currents To- flow over the
wire the electro-maFnct became very
powerful. when weak currents flowed
over the line the electro magnet be-
came weak. In front Of the core OF this
magnet a large prism was placed II
hung In a horizontal position. and
moved on pivot Attached to II was
a piece Of soft iron. This Iron was
naturally affected by the magnet. and
caused the prism TO move backward or
forward as strong or weak currents
flowed from the selenlum at the other
end OF the line.
II is a well known fact tha; II a
strong beam OF light Is projected
through a prism the latter will separ.
ate the various rays Of that light and
spread them out In the form ~ a spec
trum. or band OF colored light Al
OF the reds In the beam win be shown
at one end Of the spectrum, all Of m,
blues al the other end. with the inter.
mediate colors between. In the receiv.
or OF Szczepanlk's apparatus a power
ful incandescent lamp was placed JUS
back Of the prism, which moved on
pivot Naturally. the prism took NJ
the beam Of electric light and separated
II into a spectrum. or band Of light
with the reds at one end Of the banG
and the blues at the other end. Thil
band Of variously colored light shon'
against a partition In the upper part o
the receiving apparatus. There was
narrow slit In this partition, cut =,
that only one color OF the band OF high
could shine through at a time. d!
moving the prism backward and for
ward II was easy TO start at one chi
OF the eolored beam OF light and max
first the red lights shine through. an,
so on along the beam until the blue o
ylolets were reached.
Now. when the selenlum In the firs