The daily dispatch. [volume] (Richmond [Va.]) 1850-1884, 1877-08-03
another Tesephonc.

rrrom the philadelphia Times.l
Over a hundred invited, guests witnessed
.;vote exhibition OF the "Edison," u
Invented telephone, in the audito-
new INV, of the n,asa exhibition building last
1,;no Nv means OF the instrument yo-
Cyl n,d instrutssnt music performed at the
C"r,raI station was transmitted to the audi
,nr;,,m. where it was reproduced in louder
.o,s than fare original. The invention is
ooi,ed s.|dison's acknowledgement .Tele-
Meme and differs fundamentally from
any INSTRUMENT ofothe kind which has
~ni apncared before the. public. The
Transmitting apparatus consists simaS OF
Tong 'et,bc, having enc end covered win a
Thin steet-brass diaphragm, Kept ttght by a
strescaing ring and having soideren IN tne
",,s.,e :, him disk os platinum, Immediately
=, 'S,ont ~ which Is an adjustable ptatin UNI
waited screw fixed to rigid pillar. 40
tpr,.,sn,;t the music it Il only accessory 10
s,,-Tn sing. or piay into the open end OF tlns
hn which action causes the diaphragm 10
,sShra,c. The platinum points meeting,
.circnit is formed, and the electric curTeat
transmits every vibration over the "anc 10
the receiving end.
The receiving or reproducing apparatus
Sc based upon an original discovery maoeS S
Mr.. Edison about five years ago, when was
that when piece OF paper, mostened Ehh
cerfsin chemical solutions, IS laid upon
metallic plate connected with the positive
mole OF a battery, and pfatinuni-faced ware
connected with the negative pole OF the ssae-
terry Is drawn over the paper, the passage OF
the current through it renders the SOLUTION
oleasinous, and the wire slides freely over
the paper; but when the current IS lnees-
rupted the normal friction OF the paper re
turns, and the wire slides over 1t with drtn-
Guilty This principle IS applied %
drum or wheel having fanges on beth
sides. Over the drum, which Is
rotated bv hand-crank, passes
continuous strip Of paper, and pressing
tiobtly upon it and the wheel is smooth
platinum point at the end OF spring, Sc
cured to the centre OF the sounding-board.
The current from the battery passes to the
snrinr. thence to the platinum point, thence
through the moist paper to the drum, and
thence back to the battery. When the
drum is turned the paper passes FORWARD,
and the normal friction between the point
and the paper gives forward motlon 10
the spring also, which draws out one size
OF the sounding-board. II, now, a wave
OF current passes through tue paper Inc
friction disappears, and the spring not
normal position. This takes place at
each vibration. BY means OF this friction
the feeblest current, which would not have
anv appreciable effect upon an electro
magnet, exerts extraordinary strength.
Stretched on the sounding-board are eight
wires, forming the gamut. Any OF these
wires will yibrate when the required num-
Der OF vibrations per second are made by
the sounding-hoard For instance: Middle
C. is heard when two hundred and ffty-Sx
vibrations are made per second. The in
strument is extremely sensitive, reproduces
the highest notes, and Oyercomes, IN great
degree, the difficulty experienced IN the
use OF electromagnetic, whose sloWness OF
operation is due to the time required Tor
the magnetization and demagnetlZation OF
the iron cores and the production OF second
ary currents.
The reproducing apparatus was on a table
in full view of the entire audience. An
operator turned the drum crank, and Mr.
c. W. Greene announced before each piece
of music who was to sing or play it at the
central station, five miles distant. The re-
production sounded as il coming from a
second-rate violin that needed rosin. The
notes could be heard distinctly throughout
the largest hall in the city. The low and
medium ones were generally agreeable, but
those in high pitch were harsh and gra-
ting. Most Of the airs were hummed into
the transmitter, few were sung, and
IS Home, Sweet Home,' was played on a
clarionet, but all the reproductions had
the second-rate violin sound. One OF
the pieces was hummed by gen.
tleman in voice so low that he
could not be heard distinctly five
feet from where he stood, and yet little, If
any, difference was noticeable in its repro |
duction as compared with the others. The
clarionet piece was nothing Dut medley OF |
rasping, and squeaking, but this
was because it was played while the trans.
mitter was adjusted for lady's voice.
Snatches from score Of airs were sung or
hummed. and the reproductions warmly APP |
plauded. The most successful OF the hum |
med pieces was "Shall we Gather ct the
by lady. and Of those that We're
sung, "Hold the Fort" also by the lady.
The performance lasted an hour. When it
was abo1t half over, Professor Barker, OF
the University of Pennsylvania, made an adj
dress explanatory Of the instrument, which
he pronounced the most effective OF the
kind yet invented. "