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Modern Magic: A Practical Treatise on the Art of Conjuring
·
Professor Hoffmann
618
The
head
owes
its
movements
to
the
action
of
three
different
sets
of
levers,
each
terminating
in
a
disc
or
pedal
immediately
over
a
circular
hole
in
the
under
side
of
the
base.
The
apparatus
is
so
placed
upon
the
table
that
these
openings
correspond
in
position
with
the
same
number
of
pistons.
Fig.
287
is
a
general
view
of
the
internal
mechanism,
the
back
of
the
head
being
removed
(as
in
fact
it
may
be
in
the
original)
to
give
access
thereto.
Fig.
288
exhibits
(as
seen
from
the
rear)
the
action
of
the
left-hand
group
of
levers,
producing
the
movement
of
the
eyes.
When
an
upward
pressure
is
applied
to
the
foot
of
the
lever
a,
it
causes
the
upper
arm
c
d
of
the
elbow
piece
b
c
d
to
describe
an
arc
of
about
a
quarter
of
an
inch
from
left
to
right,
thereby
communicating
a
corresponding
movement
to
the
pair
of
levers
e
e,
working
on
the
pivots
f
f;
and,
as
a
necessary
consequence,
a
reverse
movement
to
the
opposite
ends
of
such
levers,
on
which
are
fixed
the
eyes
g
g.
As
soon
as
the
upward
pressure
is
removed,
the
spring
h,
a
spiral
coil
of
fine
brass
wire,
draws
back
the
levers
e
e,
and
with
them
the
eyes,
to
their
original
position.
To
produce
a
continuous
rolling,
the
pressure
of
the
piston
is
applied
and
relaxed
alternately,
the
effect
to
the
spectator
being
as
if
the
figure
looked
first
to
the
left
and
then
to
the
right,
although
as
already
explained,
the
active
movement
of
the
levers
is
in
the
one
direction
only,
the
normal
position
of
the
eyes
being
in
the
other
direction.
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