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750
Modern Magic: A Practical Treatise on the Art of Conjuring
·
Professor Hoffmann
426
The
trick,
as
above
described,
is
of
very
short
duration.
In
order
to
lengthen,
and
at
the
same
time
to
diversify
it,
a
second
ball
is
sometimes
employed,
of
similar
appearance,
but
of
different
construction.
This
second
ball
(see
Figs.
137,
138,
the
latter
representing
a
section
of
the
ball)
is
a
strongly
made
hollow
sphere
of
tin
or
zinc,
with
a
circular
opening
of
about
three
and
a
half
inches
across,
closed
by
a
sort
of
sliding
door,
a,
also
circular,
working
on
two
curved
arms,
b
b,
which
move
on
two
pivots,
c
c,
at
opposite
sides
of
the
ball
on
the
inside.
In
this
door
is
a
hole
an
inch
in
diameter,
answering
the
same
purpose
as
the
hole
bored
in
the
solid
ball.
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