1000000030

h~iog

dooe.

incre,\f~

YO'1r

r.re

fo al lOmakr

, h~ v~r.;

cowioing Ihe fand·¡',nh red ·ho!. lo

Ih~

a;<.n\.::

JOU

\\'ilI !ind a c,lx of nlvcr. which mnll be Oldled io arlu–

cible l'Iilh fOl1le foap ano ca\cineo \Vioe· lm.

Ihe dinill::!ioo be Oopptd wheo pan of the pbl' í":l

is drawo off, aod Ihe liq'Jor be Iheo f"ffcred

c,)ol.

many cryOals will thoul lhmio, which are a ocm,.1

tAl!

cootlilllted of the oi!rous aeid aod Cilver.

Ihe dillil–

Jadoo be carried fUrlh er, and Ilorpeo wheo oear ils con–

e1uCioo, the liquor beiog Iheo f,,["red 10 cool \ViII wholly

coagulate iOlo a blackith ",.fs c.lled Ihe

i'1<1/1.11

jlOIIC.

flpartl l' Silver froJ/llh: nilNUI Acid by P",itilo-

lion,

Lun. Coroea. Luna Coroea

(cJuccd,

INTo your folulion of filver pour

a~NII

a founh parl

in weight of fpiril of fah, folulion of fedal!, or ful ,,!ion

of fal ammoniae. The liqll<>r wiil ioOandy beeome tur–

bid and milky. Add t"'iee or

thri~e

ilS w(ighl of f,ir

water, and let il Ibnd fome fome hours ro fmlt.

\ViII depofile a while powder. DecaOl lhe cbr liquor,

and on the precipilate po", freOI

fl11/a

[orlÍ! ,

or fpiril of

fah, aod wal'm Ihe whole 00 a 1311d b.llh Wi,:l a geode

heal for fome time. Pour off Ihis feecod liqccr, aod

boi! your

precipilal~

io pure wmr, Olifliog it f(vm l

tintes, till the precip:tate aod Ihe water be bOlh quite

iofi pid. }'ilter the whole, aod dry the preeipitate, whieh

will be a

1111/1 COf/Ufl.

aod muO be reduced in Ihe fol·

lowiog maoner.

Smear the iofide of a good erueible well with foap,

Put your

luna cornea

ioto it; cOI'er ie with half in

weight of falt of tartar, thoroughlydried and pulverifcd;

~refs

the whole hard down; pour Ihereoo as much oil, or

melted tallow, as the powder is capableof imbibiog ; fee

the crucible thus chargrd, aod clofe covered, in a,mele.

iog furoace, aod, for the firll quarttt of an hour, kindle

no more lire than is oecelTary to n\1ke the crueible mo·

derate!y red; after that raife it fo as 10 OIeh the filver

and the fa h, Ihrowiog iOlo Ihe crucible

Irom

eime

time little bits of tallolV, Wheo it-

ceab

to finoke, let

the whole cool; or pour it into a hollow iron cone,

warmed and tallowed.

dijolve Si/ver, and flfar.', il Irolll Cold, hy

Ce-

71J~n/rJlion.

MIX thoroughly together

lio~

hriek·dull fou r pans,

vitriol calcioed to rednefs ooe part, aod fea-fale or oi–

tre one pHI. Moincn this pOlVder with a linle water.

With this cement cOI'er the bonom of a crueible half ao

inch thick; on this CirO bed laya thin plate of Ihe mafs

of gold and filver you iotend tO eemenl, and IVhieh )'OU

mua previouOy t,ke care tO beat iato fuch Ihio plates.

Cover tltis pl,tte with a fecood layer of cement, of the

f.1me thickoe(' as the former; on Ihis fecond bed lay an–

other plate of your melal; eover il io like maooer wilh

cement; aod fo proceed tiJl thcCIucible be filled tOwilh·

in half an ioch of ils brinL Fill up the rcmaining Ipace

",ith cement, .nd clnfe Ihe e,.ucible with a cover, IlIted

wilh a patle made of Windlor·loamand \\'ater : Se, yOllr

crucible thas ch"ged in a furnaee, whofe fire'

pl.ce

deep enough 10 let it be enlirdy furrounded with co:tls,

~uite

up 10 ilsmoulh, Light fome eoals in the furnace,

" ,~ir.~

cm OOt eo make Ihe fire

~ery

briOl al firn; io–

creal ~

it hy degrees, but only fu far as :0 mr,ke the cru–

cible nlOCJ..

rr.dy

red ; keep ur lhe fire in Ihis oegree for

.cighteen or ll'lenty hours : Then lu Ihe

fi" ,

go OUI; o·

I~_n

Ihe crucible \'Ihen ie is cold, and feparale the ament

Irom you,. plates of gold. Boil Ihe gold repcatedly in

fair WdlCr, lill the "'''ter come off quite iofipid.

P P E R.

7. h "lral' C'Nr!'

Irom ill

Orto

llEAT

yonr corper ore

a Cine powder, flaving firll

freed it as aeeuralely as roffible, by waOling and roaO–

ing, from all nony, eanhy, fulpbureous, and arbieal

pam , M,x )'our ore thus pulverifed with Ihrice its

weight uf the hlaek flux; pttt the mixture intn a eruei–

ble; cOI'er ie wilh cOOlmon fale to the thieknefs of hall

an ineh, aoo prefs lhe whole dolVo IVith your finger.

With all this Ihe erueible muO be but h,llf full. Set ie

in a melting furuaee; kindle the Cire hy d' grees, and

ri.if

it inftnfibly liU you he.r the lea·ralt crackle. Wheo

the derrepiminn is Ol'er, make the crueible moderately

red·hot fur half • quaner of atl hour, Then gi,'eaeoo·

fiderahle degree of heat, exeit;og the fire with a pair of

good perpelual bellows, fo tbat the crucible may become

very red hOt, aod be perfdtly ignited. Keep the lire

this degree for aboue a quaner of ao !¡'our ; then

take oue Ihe erueible, and with a haminer n,ike a few

blolYs on the Ooor 00 which you fet it, Break it ,.heo

cold.

,he

~pemioo

hath been rightly and fuectfsi'ully

performed. you will find ae Ihe bonom of the rellel

Iwd

regulus, of a hright ycllow colour, aod femi-m,dl"ble;

and ol'er it a fcori,1 o; a yelJowilh browo colour, hard,

aod Oliniog, from which you may feparate the regulus

wilh a hammtr.

pllrify Macl

C'N1r,

alld rcnder

mall,abl,.

BR EAK

inlo fmalJ bits che blaek copper )'OU iOleod

to purify; mix therewi,h a lhird pan in weight of

granulatcd lead, and put the whole iOlo a cupel fet uo–

drr lhe muIRe ina cupdling furnaee, ar.d prel'iouOy heat–

ed quite red, As roon .s the metals are in lhe eupel

raife Ihe fire eonliderably, making ufe, if it be ueedful,

of a pair of perpetual bellows, to melt Ihc eoprer fpeedl'

Iy. Whenit is thoroughly mdted, 10ll'er the fire alillle,

aod cOOlintle it jull high eoough

keep the metaJline

mafs in perfeé! fufiuo, The melted ,"aeter will then

hoil, aod Ihrow up fome feori:!!, which \ViII be

abfor~ed

by the cupe!.

When mon of the lead is eonfumed, raire

th~

fire a–

gain tilllhe raee of the eopper beeome bright and Ihioiog,

therclty fllewing that all ilS alloy is feparaled.

.~s

foon

as your eopper comes to this tlate, cOI'er it \\'ith ehar–

eoal duO conve)'ed ioto the eupel lI'ith an iroo laddle:

Then

ta~e

thecupe! out of the furoaee, aud let it cool.

70¿,prive C'N" 01

ill

Phlogij/oll

C.lcinalior.,

PI'T

your errper in filints ioto a tell.

a~d

fet it no–

d" themulllc of a cupclling furnaee;

li~ltt

lhe firr, and

keep up fueh a degrcc of btat as ma)

mJ~e

the II'h-"le

~u¡:e