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Modern Magic: A Practical Treatise on the Art of Conjuring
·
Professor Hoffmann
712
This
is
connected
with
the
tubular
support,
which
may
be
connected
by
a
tube
through
leg
of
stool,
and
another
tube
beneath
stage,
with
an
assistant
behind
the
scenes.
By
compressing
or
exhausting
air
through
this
tube
it
is
obvious
that
the
lever,
N,
will
be
raised
or
depressed,
and
the
clockwork
set
going
accordingly.
a
is
a
crank-pin
set
in
M,
and
connected
with
the
head
by
catgut,
T,
and
with
the
thumb
by
S.
At
R
and
R
are
two
pulleys
connected
by
gut.
Thus
if
the
hand
moves
round,
the
head
appears
to
follow
its
motions,
and
when
raised
by
pulling
S,
the
head
rises
also
by
means
of
T.
Further
explanation
seems
almost
unnecessary;
l
is
a
stop
to
prevent
elbow
moving
too
far,
and
b
b
spiral
springs,
to
keep
thumb
open
and
head
forward
respectively.
When
N
is
raised,
M
pulls
T
and
S,
the
latter
closing
thumb,
and
then
raising
arm
by
pulley
H.
If
the
lever
is
allowed
to
drop,
p
will
catch
and
keep
arm
up.
On
again
raising
N,
the
arm
will
descend.
In
addition
to
the
above
contrivance,
we
have
in
Figs.
322
and
323
another
and
simpler
arrangement,
in
which
only
one
train
of
clockwork
is
used.
On
the
same
axle
as
H
is
fixed
a
lever
and
weight,
W,
to
balance
the
arm.
A
vertical
rod,
X,
having
a
projection,
Z,
slides
up
and
down
in
guides,
Y
Y,
and
carries
the
catgut,
S
and
T.
The
quadrant,
B,
has
cogs
cut,
between
which
Z
slides
and
stops
the
motion
of
A,
which
is
moved,
as
before,
by
clockwork.
The
lower
part
of
X
is
connected
direct
with
O.
When
X
is
slightly
raised,
as
shown,
A
is
free
to
move,
but
on
exhausting
air
and
drawing
X
down,
Z
enters
the
cogs
and
stops
the
hand
over
a
card;
continuing
to
exhaust,
the
thumb
closes
and
the
card
is
lifted
up.
The
details
of
the
clockwork
the
originator
of
this
solution
omits
to
give.
He
says
there
should
be
a
fan
on
each
train
to
regulate
the
speed.
The
figure
should
be
so
placed
that
an
assistant
can
see
the
cards
in
the
semi-circular
rack
Fig.
324.
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