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224
GOO
MISCELLANEOUS
VzVLUABLE
RECEIPTS.
2d.
Construct
5
sheepskin
cups,
of
tlie
same
liei^'lit
as
the
copper
ones
and
3J
inches
in
diameter.
Set
them
inside
the
copper
cups.
od.
Make
5
zinc
cylinders,
4J
inches
high
and
2J
Indies
in
diameter,
o[)en
at
each
end,
and
place
them
inside
the
sheepskin
cups,
with
copper
sockets
at-
tached
to
them,
as
with
the
copper
Ciips.
4th.
After
placing
the
cups
thus
formed
in
a
con-
venient
position,
connect
them
together
with
copper
wires,
as
follows:
—
The
first
copper
cylinder
with
the
second
zinc;
the
second
copper
with
the
third
zinc;
the
third
copper
with
the fourth
zinc;
and
the
fourth
cop[)er
w^ith
the
fifth
zinc;
observing
always
to
con
nect
the
copper
with
the
zinc.
How
to
charge
the
Baticvri.
—
Fill
the
cups
within
about
haif
an
inch
of
the
to
[>
with
watery
then
put
1
tcaspoonful
of
Glaul.er's
salts
intt)
eacli
of
the
sheep-
skin
cups,
between
the
zinc
and
slieepskin
;
then
put
1
teaspoonful
of
blue
vitriol
into
each
of the
copper
cu[)S,
which,
wdien
dissolved,
will
charge
the
battery
for
some
days.
Introduce
tlie
conducting-
wires,
and
it
is
ready
for
action.
To
prepare
the
Gold
Solution.
—
Dissolve
the
gold
in
tw^o
parts
of
muriatic
acid
with
one
of
nitric
acid.
Then
evaporate
it
to
dryness,
and
redissolve
the
powder
in
the
proportion
of
1
gill
of
pure
water
to
1
pennyweight
of
gold.
Boil
it
a
few
minutes,
and
then
add
-J
ounce
prussiate
of
potash
:
boil
it
5
or
10
minutes.
Let
it
cool
and
settle;
then
pour
it
ofi",
and
it is
ready
for
use.
N".B.
—
Dissolve
silver
in
nitric
acid,
and
pursue
the
same
process
as
Avith
the
gold.
Prepare
a
solution
by
dissolving
1
ounce
prussiate
of
potash
in
1
quart
water.
Put
a
sufficient
quantity
of
it
in
a