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281
Heroes of the Telegraph
·
John Munro
91
The
recorder
is
now
in
use
in
all
four
quarters
of
the
globe,
from
Northern
Europe
to
Southern
Brazil,
from
China
to
New
England.
Many
and
complete
are
the
adjustments
for
rendering
it
serviceable
under
a
wide
range
of
electrical
conditions
and
climatic
changes.
The
siphon
is,
of
course,
in
a
mechanical
sense,
the
most
delicate
part,
but,
in
an
electrical
sense,
the
mouse-mill
proves
the
most
susceptible.
It
is
essential
for
the
fine
marking
of
the
siphon
that
the
ink
should
neither
be
too
strongly
nor
too
feebly
electrified.
When
the
atmosphere
is
moderately
humid,
a
proper
supply
of
electricity
is
generated
by
the
mouse-mill,
the
paper
is
sufficiently
moist,
and
the
ink
flows
freely.
But
an
excess
of
moisture
in
the
air
diminishes
the
available
supply
of
EXALTED
electricity.
In
fact,
the
damp
depositing
on
the
parts
leads
the
electricity
away,
and
the
ink
tends
to
clog
in
the
siphon.
On
the
other
hand,
drought
not
only
supercharges
the
ink,
but
dries
the
paper
so
much
that
it
INSULATES
the
siphon
point
from
the
metal
tablet
and
the
earth.
There
is
then
an
insufficient
escape
for
the
electricity
of
the
ink
to
earth;
the
ink
ceases
to
flow
down
the
siphon;
the
siphon
itself
becomes
highly
electrified
and
agitated
with
vibrations
of
its
own;
the
line
becomes
spluttered
and
uncertain.
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