The Norfolk Virginian. [volume] (Norfolk, Va.) 186?-189?, 1896-03-24

ty thousand 10 the second although
few persons with exceptional hearing
Mr.. Tesla himself is such a person-can
detect sounds of thirty thousand vibrn-
lions or even more. And naturalists
bring evidence to prove that certain an
imals or insects are gifted with tho ca
pactty of detecting sounds far bevcnd
these; indeed there is no known limit Ia
the range of theoretical sound. the limi-
tations being all in the human ear.
II Is on this theory that Mr. Tesla re
CARDS these cathode rays with their in
ereuipiy swlt vibrations as being real
~ SOUND waves producing audible tones
to any car capable OF hearing them.
HOW TESLA HEARD CATHODE
RAYS.
Or course the tremendous elevation Of
THESE sounds, due 10 the vibrations of
say. q hundred thousand in n sacona
makes it impossible: for any hnn,an
bsing fully 10 hear them. and yet OWING
perhaps TO the years which he has nass
ed in solitude in the laboratory nn1ar
the most intense nervous tension Al,
Iesin mas on various occasions hoard
some of these strange sound wavns
doubtless they We're the lower onne I'M.
pnelr tones came distinct to his ear win
s,t nneness. but clear as Il distant
Dell. II is likely that no other man nI.n,
aeard sounds of such high Vibration
and Mr.. Tesla noted with SURPRISE INA f.,
the mere hearing of these sound. nr,.
ouced q strange effect upon him ava
tended to induce sleep. Repeatedly mo
strained his ears TO listen. nd each ,ima
success was followed by the Same neoca-
1ui i"Iihs sensation. and strange 10 say.
each time as he was at the very noir, 81
sinking into unconsciousness iha sow,
grew louder in his brain. as If TO CHOW.
lhet the cerebral centre of hearing ha-
comes more acutely sensitive at the mo
ment OF passing from waking 10 sleep:nr
What makes Il probable tina, liz
cathode rays are rapidly Vibrating SOM,
waves transmitted through the air and
not eth@r waves, as Others have a n;,.,',
ed. is the we'll established fact I'm. I,,ri,
which moves through the ether viii no,
penetrate certain solids, bur that e,una
which moves through the air. viii ,,c,c
trate most of thes. solids. Fur,hnr.
more, 1t has long been known that ,bc
sensitlzed Photographic plate is chani.
caliy erected by certain sounds. even
those audible 10 the ear and vno,.;
l,ents now oe!nS carried on by Mr.. Tesla
and oilers are likely 10 demontr.;a c1','
cluslvely that neither electricity. nor I'M.
seen light waves. or chemical rave h,,,
sound waves, are the cause Of the nbo
nomena pointed out bv P,y,fnsso,
Roentgen.
from this Ii becomes plain that elec
frlctty has no necessary rela l:on 10 tn :,
shadow photographs Neither have m,
Crookes tubes. They are useful at pr,s
ent. indeed essential. as they form IN,
most convenient means of throwing ,ht
air into a state of such rapid vibratio,
as VIII produce effects upon the sensi
tized plate. But a tuning fork would a,
this just as well. so Mr.. Tesla thinks
II one could be made that would produc,
q sound of hundred thousand vibra
ftons in second, or bell OF correspond
/; Ing pitch would answer equally. or an,
other mechanical device which would
g set the air rbra ting at such enormous
rapidity.
CATHODE RAYS WITHOUT
CROOKES TUBES?
Ihare is no doubt. Mr.. Tesla SAYS. tina
8 s ans Afookes tubes might be entirely dis
& pensed with In taking these shade pho
tographs and the cathode rays produced
IN various other ways In his own ex
!. S - .l0'eis in shadow Photography Mr.