225 / 330
600
MISCELLANEOUS
VALUABLE
RECEIPTS.
L'25
bowl
or
other
earthen
vessel,
and
add
to
it
tlie
gold
solution.
Bend
the
conducting
wires
so
that
the
two
poles
will
be
immersed
in
the
solution.
Attach
a
small
piece
of
gold
or
platina
to
the
positive
pole
or
con
ducting-
wire
which
is
attached
to
the
copper
cups,
and
place
the
pieces
to
be
gilted
on
the
nega-
tive
or
the
one
proceeding
from
the
zinc cup.
No.
489.
Galvanism
Simplified.
—
Silver-
Plating
Fluid,
Dissolve
1
ounce
nitrate
of
silver,
in
crj^stal,
in
12
ounces
soft
water.
Then
dissolve
in
the
water
2
ounces
cyanuret
of
potash.
Shake
the
whole
to-
gether,
and
let
it
stand
till
it
becomes
clear.
Have
ready
some
half-ounce
vials,
and
fill
them
half
full
of
Paris
white,
or
fine
whiting
;
then
fill
up
the
bottles
with
the
liquid,
and
it
is
ready
for
use.
The
wdiiting
does
not
increase
the
coating-powder;
it
only
helps
to
clean
the
articles,
and
to
save
the
silver-fluid
by
the
bottles.
No.
490.
Silver
Solution
for
Plating
Cojjper,
Brass,
and
Gerinan
Silver.
Cut
into
small
pieces
a twenty-five-cent-piece,
and
put
it
into
an
earthen
vessel
with
|
ounce
of
nitric
acid.
Put
the
vessel
into
warm
water,
uncovered.
until
it
dissolves.
Add
J
gill
of
water
and
1
tea-
suoonful
of
fine
salt:
let
it
settle.
Drain
ofi*
and
re|)eat,
adding
water
to
the
sediment
until
the
acid
ta>tc
is
all
out
of
tbe
water.
Add,
finally,
about
a
pijit
of
water
to
the
sediment
and
4
scruples
cyanide
2H