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Отмена
441
Donovan
rose
to
his
feet
in
excitement
.
"
And
it
strikes
an
equilibrium
.
I
see
.
Rule
3
drives
him
back
and
Rule
2
drives
him
forward
-
"
442
"
So
he
follows
a
circle
around
the
selenium
pool
,
staying
on
the
locus
of
all
points
of
potential
equilibrium
.
443
And
unless
we
do
something
about
it
,
he
'll
stay
on
that
circle
forever
,
giving
us
the
good
old
runaround
.
"
Then
,
more
thoughtfully
:
"
And
that
,
by
the
way
,
is
what
makes
him
drunk
.
At
potential
equilibrium
,
half
the
positronic
paths
of
his
brain
are
out
of
kilter
.
I
'm
not
a
robot
specialist
,
but
that
seems
obvious
.
Probably
he
's
lost
control
of
just
those
parts
of
his
voluntary
mechanism
that
a
human
drunk
has
.
Ve-e-ery
pretty
.
"
Отключить рекламу
444
"
But
what
's
the
danger
?
If
we
knew
what
he
was
running
from
-
"
445
"
You
suggested
it
.
Volcanic
action
.
Somewhere
right
above
the
selenium
pool
is
a
seepage
of
gas
from
the
bowels
of
Mercury
.
Sulphur
dioxide
,
carbon
dioxide
--
and
carbon
monoxide
.
Lots
of
it
and
at
this
temperature
.
"
446
Donovan
gulped
audibly
.
"
Carbon
monoxide
plus
iron
gives
the
volatile
iron
carbonyl
.
"
447
"
And
a
robot
,
"
added
Powell
,
"
is
essentially
iron
.
"
Then
,
grimly
:
"
There
's
nothing
like
deduction
.
We
've
determined
everything
about
our
problem
but
the
solution
.
We
ca
n't
get
the
selenium
ourselves
.
It
's
still
too
far
.
We
ca
n't
send
these
robot
horses
,
because
they
ca
n't
go
themselves
,
and
they
ca
n't
carry
us
fast
enough
to
keep
us
from
crisping
.
And
we
ca
n't
catch
Speedy
,
because
the
dope
thinks
we
're
playing
games
,
and
he
can
run
sixty
miles
to
our
four
.
"
Отключить рекламу
448
"
If
one
of
us
goes
,
"
began
Donovan
,
tentatively
,
"
and
comes
back
cooked
,
there
'll
still
be
the
other
.
"
449
"
Yes
,
"
came
the
sarcastic
reply
,
"
it
would
be
a
most
tender
sacrifice
--
except
that
a
person
would
be
in
no
condition
to
give
orders
before
he
ever
reached
the
pool
,
and
I
do
n't
think
the
robots
would
ever
turn
back
to
the
cliff
without
orders
.
450
Figure
it
out
!
We
're
two
or
three
miles
from
the
pool
--
call
it
two
--
the
robot
travels
at
four
miles
an
hour
;
and
we
can
last
twenty
minutes
in
our
suits
.
It
is
n't
only
the
heat
,
remember
.
Solar
radiation
out
here
in
the
ultraviolet
and
below
is
poison
.
"