The Red Cloud chief., 1877-08-23

wv G tlAt - ~ 49,
messed a private exhibition of the I'd
| ison.-a newly invented telephone. 90
the auditorium Of the Main Exhibition
Building, last evening. By mean ~
the instrument vocal and instrumental
music performed AZ the central station
WAS transmitted To the auditorium,
where il was reproduced IN a louder
tone than the original The invention
Is called "EdisoL's e.ectro-motograph
telephone" and differs fundamentally
from any instrument Of the kind which
has vet appeared before the public. The
transmitting apparatus consists simply
of a long tube. having n end coyrr~l
with thin sheet brass diaphragm. kept
tight by a stretching ring. and having
| solderr,i IN the centre "A thin disk OF
platinum. immediately In front Of
which is an a Unstable platinum-pOint-
Ell screw fixed 10 rigid pillar. To
transmit the music il is only necessary
to hum. sing OF play into the open end
of this tube. which action causes tie
diaphragm Ia yIhrate. The platinum
points meeting. "A circuit Is formed. AMI
the electric current transmits ever
vibration over the wire 10 the reCe!yin.
end.
The receiving or Reproducing apPara-
tus IL based upon AN original discovery
made 10y Mr.. Edison about i've wear
ago. which was that when a piece %
paper Is moist.ned with certain ch"m,-
cal solutions. IS laid upon a metal
plate connected with the positive poe
Of "A battery. AMI a platiuum-fscei W.
connected with "a" neg .tiye pole - The
battery N drawn over the paper. The
pasSag" Of the current Through 10 rent
ers the solution ulcaginous. ami TIE
wire slides freely over ia. paper; hu'
when the CaTTent Is interrupted IT,
normal friction of the paper returns.
and the wire slides over Il with d.fl-.-
y. This principal - applied - The -
ce4Ner.-a% sounding board and a drum
or whe-l having q inges on bDtI sI~
80 go" NAti - AtalAHNa Ct =
haniCrank. passes a continuous strip
Of paper, and pressing tightly upon A.
and the wheel = a smooth platinum
point and the end of a spring. src-r~!
20 tie centre ~ the soundingipA-I
lk- current from TIE battery p1es.4s =.
? sY--Z. ;A-oc- "a The platinum
point, thence through - mos; yAj~r
:oth- drum a.! :h~a-~ ,Ark % ~ a.
;eTy. Wh-- :a~ DUN = t1ru-t 80
gSI-T pAss@s t-WA-L. au4 - norma.
friction t-:S-- - ,o.: Al tie -
g~T E'@ = tv-wA-t @a.1u - -
spring ASA w. G-Aws Oh: a-~ ste
Cft4e sounding hoard. T. row a wAy~
Il curreu; p.S~~ through 80 PAP
the friction disappears. and 80 s;rc<
being pulled. the re~onant@r r~sa.1s
i's hCrz1ntal position TINS ;Ak~ s1~ -
a; each vibration. By means % D..
the fe.bles; current. wt.r.
not have ANY -appr-ciab,s -@~-
spon an eiectro-mazre- eIsr.s extra
strength Stretched on .hlsso-1.-
.ng board are eight wire. forming 49,
yamut- Any 0fthese wlIl vihrAts x-- .
he required number % vibrations -
second are made by ths sounding boah
For instance. middle c - heard = s1 -
- vibrations ar. made l~r ssS1rt
lhe ins:rumen. "a extremely ssns..vs -
'sprodaces the hiyhes; no.-s. ant c7s- v
oms IN a grea: degre. the ti1~1..F
IN the Use % s,sc:rouaz
-ss. whose slOSness ~ ~o}-ra.lg- a
.ue 10 tie time required for The 10
and demaxustization - -
ron cores and the production % s~o1
~ curr-n.4
The reproducing apparatus wAs - a 3
II fun view q The entire AMI
nee An operator turnct The drunA
rank. and M G. ". Gr-~Ds A2nouno-~
efOre each p,eoe OF music who WA -
.ng or play Z a: TIE Central >.SJn.
sc miles q slant The r~tprUt1ct n
FUNDED a. II coming from a s~oord- i
~ violin TIA. needed rr@in- IT, ao,~
1uld be beard distinctly through. n
J. laryss: hail 80 The eify.-PAUct<-
7iu@.