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281
Heroes of the Telegraph
·
John Munro
95
About
the
same
time
he
revived
the
Sumner
method
of
finding
a
ship's
place
at
sea,
and
calculated
a
set
of
tables
for
its
ready
application.
His
most
important
aid
to
the
mariner
is,
however,
the
adjustable
compass,
which
he
brought
out
soon
afterwards.
It
is
a
great
improvement
on
the
older
instrument,
being
steadier,
less
hampered
by
friction,
and
the
deviation
due
to
the
ship's
own
magnetism
can
be
corrected
by
movable
masses
of
iron
at
the
binnacle.
Sir
William
is
himself
a
skilful
navigator,
and
delights
to
cruise
in
his
fine
yacht,
the
Lalla
Rookh,
among
the
Western
Islands,
or
up
the
Mediterranean,
or
across
the
Atlantic
to
Madeira
and
America.
His
interest
in
all
things
relating
to
the
sea
perhaps
arose,
or
at
any
rate
was
fostered,
by
his
experiences
on
the
Agamemnon
and
the
Great
Eastern.
Babbage
was
among
the
first
to
suggest
that
a
lighthouse
might
be
made
to
signal
a
distinctive
number
by
occultations
of
its
light;
but
Sir
William
pointed
out
the
merits
of
the
Morse
telegraphic
code
for
the
purpose,
and
urged
that
the
signals
should
consist
of
short
and
long
flashes
of
the
light
to
represent
the
dots
and
dashes.
Sir
William
has
done
more
than
any
other
electrician
to
introduce
accurate
methods
and
apparatus
for
measuring
electricity.
As
early
as
1845
his
mind
was
attracted
to
this
subject.
He
pointed
out
that
the
experimental
results
of
William
Snow
Harris
were
in
accordance
with
the
laws
of
Coulomb.
In
the
Memoirs
of
the
Roman
Academy
of
Sciences
for
1857
he
published
a
description
of
his
new
divided
ring
electrometer,
which
is
based
on
the
old
electroscope
of
Bohnenberger
and
since
then
he
has
introduced
a
chain
or
series
of
beautiful
and
effective
instruments,
including
the
quadrant
electrometer,
which
cover
the
entire
field
of
electrostatic
measurement.
His
delicate
mirror
galvanometer
has
also
been
the
forerunner
of
a
later
circle
of
equally
precise
apparatus
for
the
measurement
of
current
or
dynamic
electricity.
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