Lab
Library
Journal
Shop
Sign in
to keep
Share image
1
750
Modern Magic: A Practical Treatise on the Art of Conjuring
·
Professor Hoffmann
645
Almost
any
kind
of
battery
may
be
used
to
produce
the
necessary
current,
but
for
magical
purposes
one
of
the
most
convenient
is
the
Bichromate
Bottle
Battery,
depicted
in
Fig.
302.
This
consists
of
a
plate
of
zinc
and
a
plate
of
carbon
(or
sometimes
two
plates
of
carbon)
immersed
in
an
exciting
fluid,
consisting
of
two
ounces
and
a
half
of
bichromate
of
potash
dissolved
in
a
pint
of
water,
with
the
addition
of
one-third
of
an
ounce
of
sulphuric
acid.
The
bottle
is
only
filled
to
the
top
of
the
spherical
portion,
and
the
zinc
is
so
arranged
that
it
can
be
drawn
up
into
the
neck,
and
so
out
of
the
solution,
when
it
is
desired
to
suspend
the
action
of
the
battery.
The
wires
for
conducting
the
current
should
be
of
copper
covered
with
silk
or
cotton,
and
one
of
them
must
be
connected
with
the
zinc
plate,
and
the
other
with
the
carbon
plate
of
the
battery,
which
has
“binding
screws”
affixed
for
this
purpose.
For
the
purpose
of
instantly
completing
or
disconnecting
the
electric
circuit,
the
wires
are
affixed
to
the
opposite
sides
of
what
is
called
a
connecting
stud
(see
Fig.
303),
being
a
circular
disc
of
wood
or
porcelain,
with
a
moveable
stud
or
button
in
the
centre.
On
pressing
this
stud
with
the
finger,
the
ends
of
the
two
wires
are
brought
in
contact,
and
the
circuit
is
completed;
but
as
soon
as
the
pressure
is
removed,
the
stud
rises
by
the
action
of
a
spring,
and
the
circuit
is
again
broken.
Marker
Marker
Fine marker
White-out
Fine white-out
Circle
Paint
Unmarker
Hand
Scalpel
Dice
Sieve
Purify
Undo
Redo
Start over
