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1
378
The Story of the Atlantic Telegraph
·
Henry M. Field
376
In
the
Siphon
Recorder
(a
view
of
which
is
shown
in
Fig.
1),
the
indicator
consists
of
a
light
rectangular
signal-coil
of
fine
wire,
suspended
between
the
poles
of
a
powerful
electro-magnet,
so
as
to
be
free
to
move
about
its
longer
axis
which
is
vertical,
and
so
joined
up
that
the
electric
currents
constituting
the
signals
through
the
cable,
pass
through
it.
A
fine
glass
siphon-tube
is
suitably
suspended,
so
as
to
have
only
one
degree
of
freedom
to
move,
and
is
connected
to
the
signal-coil
so
as
to
move
with
it.
The
short
leg
of
the
siphon-tube
dips
into
an
insulated
ink-bottle,
which
permits
of
the
ink
contained
by
it
being
electrified,
while
the
long
leg
is
situated
so
that
its
open
end
is
at
a
very
small
distance
from
a
brass
table,
placed
with
its
surface
parallel
to
the
plane
in
which
the
mouth
of
this
leg
moves,
and
over
which
a
slip
of
paper
may
be
passed
at
a
uniform
rate
as
in
the
Spark
Recorder.
The
effect
of
electrifying
the
ink
is
to
cause
it
to
be
projected
in
very
minute
drops
from
the
open
end
of
the
siphon-tube,
towards
the
brass
table
or
on
the
paper-slip
passing
over
it.
Thus
when
the
signal-coil
moves
in
obedience
to
the
electric
signal
currents
passed
through
it,
the
motion
then
communicated
to
the
siphon,
is
recorded
on
the
moving
slip
of
paper
by
a
wavy
line
of
ink
marks
very
close
together.
The
interpretation
of
the
signals
is
according
to
the
Morse
code;
the
dot
and
dash
being
represented
by
deflections
of
the
line
to
one
side
or
the
other
of
the
centre
line
of
the
paper.
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