New-York tribune., 1877-05-05

I'm the center of the brass diaphragm is soldcrcd
thin disk of platua, and immediately in front of
tins disk is an adjustable platina-poncd screw Sc
cured to a rigid pillar Both the tube and tho pillar
are rigidly secured TO an iron base, TINS sohdl'y
being necessary 10 insure a permanent adjustment
and transmi4sio of the vibrations. The use OF
brass diaphragm and riud point removes the causes
which made perfect Transmission with the Reiss IN
strumcnt impossible The receiving apparatus cn-
ploycd by Mr. Edison for reproducing the tones Is
based upon an original discovery made by HIN som"
five year, ago. This discovery was that when
piece of paper mo,tcucd with certain chemical soIu-
tions is laid upon "a metallic plato connected to the
positive pole OF battery, aud plaiina-iaccd wire
connected to the negative pole of the battery IS
drawn over the paper, the passage of the curcnt
through IT causes all friction to disappear, and the
patua-fccd witc slides over the paper rs iron upon
ce but if the current be interrupted, this effect m
stantiy disappears aud the normal friction Of the
naper cause, the wires 10 be drawn over il with diff
tcnIty. This principle is applied to the receiver
lSec daeramJ il resonant box mounted upon
two short pillars. ID is drum or vhecL having
n,uge. ON both sides This wheel is secured to shaft
rotated by the handle II. A continuous strip Of
paper from the reel passes over the drum D, tine
surface of which IL roUghcucd. Resting upon the
paper ia a smooth piaina point upon the end OF thc
spring Il, which il secured to the center ot the
resonant box and presses the platlna point with
considerable force upon the chemically prepared
paper Ilc current from the battery passes to the
spring Il. to the platna point, thence through the
moist paptr-which in this state ~ a conductor-
thence 10 the drum and back to the battery
The operation Ii as follows: When the handle Is
turned the paper PASSES forward and the normal rlc-
tion between the point and the paper serves to gave
forward motion 10 the spring hence one side oi the
rrsonaui box il drawn out. If now "A wave OF cur
rent passes through the paper all friction ceases'
and the spring not being pulled the side Of the rcSo
nator rcgains It's normal position, and this lakes
place at each vibration. By means Of this friction
the most feeble currents which would not produce
the slightest effect upon an elcctro-magnet, thus
exert extraordinary strength. This apparatus
will respond and reproduce with great power the
highest notes of the human voice, which are nearly
iuaudible when magnets are employed, the slowness
Of their opcmtiun being due to the time required fof
the magnctzatiou and demagnctizaton OF the IRON
cores and the production of secondary currents
which DELAY the action and mutilate the signals
No secondary actions or delays take place IN the
"MotographD which is the name gwen by MI
Edison 10 "A telegraph instrument invented by INN
wherein this priucipe il employed The Moto-
groph WAS practically tested at the Newark Opera
House on Saturday afternoon last IN the presence oi
several gentlemen of the press and the experiments
were very successful Mr.. Edison stated to
TRIBUNE reporter that he still pursuing hIs IN
ycstiuation of tho subject with the view TO pro-
ducing a talking telephone.