The Bryan daily eagle. (Bryan, Tex.) 1895-1898, 1896-04-17


nouncemcni made by him. Prof Dol
bear OF Boston announced In April
1891. 1T Is actually possible to take
a photograph OF an object In absolute
darkness with the ether waves yet mp
hy an electric machine The fact
established. howeyer. by Prof. Rocnt
cen In his discovery II that these ether
waves, now known as cathode ray
which are invisible To the naked eye,
viii pass through opaque substances,
such as wood. chonitc. many kinds of
metals. iesliy tissues aud other SEEM
lngly OPAQUE substances.
riof. Draper. about iifiy years ago
discovered that Photographic action
inkcs place IN that region of the solar
spectrum which is beyond the violet
ray. aud at a later date Ahlcy dcsig-
mated that this action was below the
red nay. Thus Il has for many years
been known aud clearly demonstrated
fhat tie luminous ray which would
affect The eye Is not necessary cs-
senllal In making q photograph, l'ro-
lessor Hertz has demonstrated that
the waves in the ether produced by
electrical means could be- rclmcied, re-
Elected and polarizcd, the same rs the
Ordinary llrht waves. There IS. how
ever. large amount of diversity OF
opinion on this matter, and many
scientists. who have been and are
carefully studying the cathode rays,
dlncr widely from the assertion mndc
hy Prof Rocuigcn that the cathode
lary can he refmcled. reelected and pol
afiycd
ON tie whole subject matter there Is
set much To he discovered which Will
no doubt lc rc,calcd hy careful study
and experiment Ia ilm'.
Just 10 explain 90 those who do not
know this apparatus. and who muy
have Euch a vague idea of what %
generally ~ ANA how Il works, X lit.
ting az this stage.
In the first place. all theory aud
thought OF something like photo
graphic apparatus must hc dlspelled.
The apparatus has neither camera nor
lens, aud the results are obtained With
nut oven exposing TIC naked plate 10
the cathoda ray. The CroOkcs tube Is
an ordinary glass globe, and at either
end are poles for the electric nuid from
an induction coil To pass through. The
ray j. Of a grconishyellow, and seems
10 float around the interior Of the tube
In n wavy manner. This II tie Hight
giving the wonderful result, and The
magic ray upon which there Is "a
much diversity OF opinion and the
properties of which have caused "a
much controversy.
This cathode II difficult 10 describe
IN ordinary language. II may be de
scrlhcd as n small disc, or plate OF alu
nlnum. incloscd IN glass bulb from
which the air hiss been previously eN
hausted. Opposite the cathode Is th'
anodc. the terminal of wire connect
ed with the batteries When a power
ful current * passed between the an
ode aud the cOihodc. and n circuit ere
ated. light results with rays.
Let the reader further follow IN th'
result of experiment. and perhaps h'
can then have an idea Of what the ap
pantus really Is and how L works.
An ordinary scnsiiiEcd silver plate
the same as used IN photography, b
wrapped Ia three or four thicknesse'
OF orange colored paper, or, for ina
matter. placed Ia n dark slide, ana th'
shutter. n OF the proper Cardboard
left closed. The plate Is thus protect
ed from the white llght or ordinary
photorraphlc ray. The plate thu
wrapped or slide Is placed under 'h
Crookes tube. aud the object iron
which the result Is required Is place
ON ton of tie slide or covering. ih'
Crookcs tube Is arranged about tire
or four Inches from the object so TIA
he rays coming from the tube viii ial
directly perpendicular ON the object
The electric fluid may be generated u
an ordinary wet or dry cell ana thei
PASSED through Ruhmkorll COLI III
electric nuld l. turned on, and IN
length OF exposure largely depends q
the numlcr Of interruptions OF IN
, electric current The exposure for
: result through an Inch board would b