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281
Heroes of the Telegraph
·
John Munro
223
The
recording
tympanum,
which
is
about
the
size
of
a
crown-piece,
is
fitted
with
a
mouthpiece,
and
when
it
is
desired
to
record
a
sentence
the
spindle
is
started,
and
you
speak
into
the
mouthpiece.
The
tympanum
vibrates
under
your
voice,
and
the
stylus,
partaking
of
its
motion,
digs
into
the
yielding
surface
of
the
wax
which
moves
beneath,
and
leaves
a
tiny
furrow
to
mark
its
passage.
This
is
the
sonorous
record
which,
on
being
passed
under
the
stylus
of
the
reproducing
tympanum,
will
cause
it
to
give
out
a
faithful
copy
of
the
original
speech.
A
flexible
india-rubber
tube,
branching
into
two
ear-pieces,
conveys
the
sound
emitted
by
the
reproducing
diaphragm
to
the
ears.
This
trumpet
is
used
for
privacy
and
loudness;
but
it
may
be
replaced
by
a
conical
funnel
inserted
by
its
small
end
over
the
diaphragm,
which
thereby
utters
its
message
aloud.
It
is
on
this
plan
that
Edison
has
now
constructed
a
phonograph
which
delivers
its
reproduction
to
a
roomful
of
people.
Keys
and
pedals
are
provided
with
which
to
stop
the
apparatus
either
in
recording
or
receiving,
and
in
the
latter
case
to
hark
back
and
repeat
a
word
or
sentence
if
required.
This
is
a
convenient
arrangement
in
using
the
phonograph
for
correspondence
or
dictation.
Each
instrument,
as
we
have
seen,
can
be
employed
for
receiving
as
well
as
recording;
and
as
all
are
made
to
one
pattern,
a
phonogram
coming
from
any
one,
in
any
art
of
the
world,
can
be
reproduced
in
any
other
instrument.
A
little
box
with
double
walls
has
been
introduced
for
transmitting
the
phonograms
by
post.
A
knife
or
cutter
is
attached
to
the
instrument
for
the
purpose
of
paring
off
an
old
message,
and
preparing
a
fresh
surface
of
the
wax
for
the
reception
of
a
new
one.
This
can
be
done
in
advance
while
the
new
record
is
being
made,
so
that
no
time
is
lost
in
the
operation.
A
small
voltaic
battery,
placed
under
the
machine,
serves
to
work
the
electric
motor,
and
has
to
be
replenished
from
time
to
time.
A
process
has
also
been
devised
for
making
copies
of
the
phonograms
in
metal
by
electro-deposition,
so
as
to
produce
permanent
records.
But
even
the
wax
phonogram
may
be
used
over
and
over
again,
hundreds
of
times,
without
diminishing
the
fidelity
of
the
reproduction.
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