Daily press and Dakotaian. [volume] (Yankton, Dakota Territory [S.D.]) 1875-1880, 1879-03-06
the IMPROVED TELEPHONE.
Rdisen Suhstitutes Piece OF Chalk for
the Electro Magnet.
New York Herald

E0tson Substitutes q Piece OF Chalk for
the Electro Magnet.
New York Herald
The Cunard steamer Algeria sailed for
Liverpool yesterday, having on board Mr..
=. +. Etison, who has taken with him one
Ut the greatest inventions of the age. On
learning that the professor bad succeeded
10 perfecting q great Improvement 10 the
telephone receivers a Herald reporter went
to MenlO Park t. learn he nature of the IN
strument. Professor Edison received the
reporter verv Cordially and ut once set abou,
giving him all the de'a,ls of his wonderful
Invention. He said he discovered The
principle Of the electro-motOgrsph some
five or six years agr,, but did not apply II
to the telephone receiver until quite re
Gently.
The description Of the apparatus is as
lows: A diaphragm of mica four inches in
diameter is held in suitable framework.
A hand crank is made to rotate small
cylinder previously impregnated with the
proper chemical solution), with contin-
uous forward motion directly outward from
the face of the diaphragm. One end of
metal bar is fastened to the centre of the
diaphragm and the other end rests upon
the chalk cylinder, being held down very
AAA1Ay " epiAuk' Auc ClECuIt ID moO0 from
this metal bar, through the chalk cylinder
to the base. As the cylinder is rotated
either by hand or other power the friction
between the metal bar and the chalk cylln.
der is very considerable, and the diaphragm
Is drawn Or bowed outward toward the cyl
inder. This operation i purely mechani
cal and local.~ Whea The electric vsves are
transmitted from the distant station by the
(Vhn EAssn,,p.
mitter) over the wire to the receiver. each
w.ys, - 1t passes through the chalk cylin-
der effects BY electslc.chemical decomposit-
ion more or less neutralization of the friction
between the bar and the cylinder, according
O. the wave may be strong or weak one.
The resultant effect of each wave is the free
lnE Of the aiaphrasm: permitting it to re:
tween, efectsa vibration Of the diaphragm
in perfect accord with the voice of the
speaker, the action being solely electrical
and chemical. The element Of time is not
= factor - in the electromagnetic instru-
ment. where. as is we'll known. perceptble
degree Of time is requisite for charge and
discharge. lnthis new telephone apparatus
Edison dispenses entirely with the electric
uss6uSsS AS1SAOAVtS uscu ~ 0ll IeIepuOuc re.
ceivers. substituting the electric.motoRraph
principle, This, by its greater delicacy and
power, is made to vibrate very much
larger diaphragm, than il poesible with tue,
.lectro-msgnet, thus giving greater volume
Of sound and obviating The necessity for
holding L. The telephone to u The ) ear.
BY it the voice of the speaker
is transmitted to the distant station
without the loss Of volume. It fact, at
times. with very consid erabls increase, the
telephone sp. aks louder than the person
talking at the transmitting station. Ii also
produces the highest musical notes with the
same perfection "a the lower ones, someth,ue
that wsa found impossible in the old ma
chine. These points Of superiority over the
electro magnet are due to the fac, that while
in the electro magnet the electric waves con-
stitu,e the force which vibrates the dia-
phragm of the receiver. IN the new machine
they only control il, the force used b-ing
s!rictly local. either the power Of hand or
clock ork.
The two instruments taken Europe BY
NJ. G. ?. Ediaoa we're tested q, u e labora.
tssy on Tuesday night, aud lound 70 work
u . Dpk osa sdoassAis uaasee. IAsy