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1
281
Heroes of the Telegraph
·
John Munro
222
The
wax
is
moulded
into
the
form
of
a
tube
or
hollow
cylinder,
usually
4
1/4
inches
long
by
2
inches
in
diameter,
and
1/8
inch
thick.
Such
a
size
is
capable
of
taking
a
thousand
words
on
its
surface
along
a
delicate
spiral
trace;
and
by
paring
off
one
record
after
another
can
be
used
fifteen
times.
There
are
a
hundred
or
more
lines
of
the
trace
in
the
width
of
an
inch,
and
they
are
hardly
visible
to
the
naked
eye.
Only
with
a
magnifying
glass
can
the
undulations
caused
by
the
vibrating
stylus
be
distinguished.
This
tube
of
wax
is
filed
upon
a
metal
barrel
like
a
sleeve,
and
the
barrel,
which
forms
part
of
a
horizontal
spindle,
is
rotated
by
means
of
a
silent
electro-motor,
controlled
by
a
very
sensitive
governor.
A
motion
of
translation
is
also
given
to
the
barrel
as
it
revolves,
so
that
the
marking
stylus
held
over
it
describes
a
spiral
path
upon
its
surface.
In
front
of
the
wax
two
small
metal
tympanums
are
supported,
each
carrying
a
fine
needle
point
or
stylus
on
its
under
centre.
One
of
these
is
the
recording
diaphragm,
which
prints
the
sounds
in
the
first
place;
the
other
is
the
reproducing
diaphragm,
which
emits
the
sounds
recorded
on
the
wax.
They
are
used,
one
at
a
time,
as
the
machine
is
required,
to
take
down
or
to
render
back
a
phonographic
message.
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