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281
Heroes of the Telegraph
·
John Munro
224
The
entire
phonograph
is
shown
in
our
figure.
[The
figure
is
omitted
from
this
e-text]
It
consists
of
a
box,
B,
containing
the
silent
electro-motor
which
drives
the
machine,
and
supporting
the
works
for
printing
and
reproducing
the
sounds.
Apart
from
the
motive
power,
which
might,
as
in
the
graphophone,
be
supplied
by
foot,
the
apparatus
is
purely
mechanical,
the
parts
acting
with
smoothness
and
precision.
These
are,
chiefly,
the
barrel
or
cylinder,
C,
on
which
the
hollow
wax
is
placed;
the
spindle,
S,
which
revolves
the
cylinder
and
wax;
and
the
two
tympana,
T,
T',
which
receive
the
sounds
and
impress
them
on
the
soft
surface
of
the
wax.
A
governor,
G,
regulates
the
movement
of
the
spindle;
and
there
are
other
ingenious
devices
for
starting
and
stopping
the
apparatus.
The
tympanum
T
is
that
which
is
used
for
recording
the
sounds,
and
M
is
a
mouthpiece,
which
is
fixed
to
it
for
speaking
purposes.
The
other
tympanum,
T',
reproduces
the
sounds;
and
E
E
is
a
branched
ear-piece,
conveying
them
to
the
two
ears
of
the
listener.
The
separate
wax
tube,
P,
is
a
phonogram
with
the
spiral
trace
of
the
sounds
already
printed
on
its
surface,
and
ready
for
posting.
The
box
below
the
table
contains
the
voltaic
battery
which
actuates
the
electro-motor.
A
machine
which
aims
at
recording
and
reproducing
actual
speech
or
music
is,
of
course,
capable
of
infinite
refinement,
and
Edison
is
still
at
work
improving
the
instrument,
but
even
now
it
is
substantially
perfected.
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