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1
750
Modern Magic: A Practical Treatise on the Art of Conjuring
·
Professor Hoffmann
619
Fig.
289
shows
the
action
of
the
second
or
middle
group
of
levers,
serving
to
produce
the
opening
of
the
mouth.
The
chin
of
the
figure
consists
of
a
solid
block
of
wood
i,
working
on
a
pivot
j
in
each
cheek,
and
so
counterweighted
that
its
normal
position
is
as
in
Fig.
289,
thus
keeping
the
mouth
closed.
When,
however,
the
shaft
k
is
raised
by
pressure
from
below,
the
lever
l
rises
with
it,
and
proportionately
depresses
the
opposite
end
of
the
block
i,
thereby
opening
the
mouth.
As
soon
as
the
pressure
is
removed,
the
block
falls
back
into
its
original
position,
and
the
mouth
closes.
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