1000000030

168 / 1042

e JI E M
""1a 1r.l' pl'~,9i, nI~lhnd of oI"ing i . T he zinc mon
UC '1I""d .n , clI.e.l,I" :lnd 11irr,d loll/ldy \lith a /Imng
iron Wlle, wlllle Itllow . n.l minc,,1 lull'hlll' .lIe .dlel'·
nald)' p",jcl~<ll opon It; hllt lo trt.•t Ihe qo.1I1Iit)' ,,r
fulphur m<y ~rcJ<ly "\(:e<d of Ihe t"lIulV. Ir tho
folphur 110 not burn entil'dy away. hllt fOl'm a killd ()f
lcoriJ on Ihe (urfaee ,,1' Ihe , It is a lign lhat yoor
ícmi.m,·u l eontains IcJd. [n this cafe yoo moti conlinue
throlVtng in n10re fo!phllr, and ke~p tI.rring Ihe zinc in·
cdE'"tly, till you pe..eiye Ihat tho (ulphor cea(es to u·
nilo any more IVilh a mmllic (uhn.nce, hUI borns (ree·
11' OD Ihe lurf..ce of Ihe 7.inc. The (emi·metal is Ihen
refined; bc.:,ule Ihe lilirhur, IVhich CJnnot d.n'olye it,
unltes yery readily IVith the Icad, or olher metallte (ub·
tlance, conlainetl in il
If zinc thus rofineo b: mixcd IVilh pure correr, in Ihe
prnportion of a founh tlr ~ Ih"d pan. lno the mlxlure be
kept in furoon andconll.tntlytlirring forlame IIt11e, thebra(s
produced IVill be as dU[lilc, when cold, as th,tI made by
cemenration whh the 1"Pi'J ca/tlll,;IIO,j¡.
With regard to prinCl's mml , and olher imilalions
of ~oIJ. they are m ..de euher wilh copper or brafs re·
eomb.ned wllh more zinc. As it is ncc. n:"y. for ei.
.in~ th"m a hne ¡lulJen Collour, lO mix wi th thcmotha
prop,,"olts o( th.n .hat required 10 n••ke bra(s on·
Iy, the)' are ccnwlly mueh lefs uu~tile.
Zin: di);/",d i/l Ihe Mine,./ AciJI.
W E.I KE' eonecntrmd oil of ,itriol by mixing wilh
il an equal qUJr.lity of \later. [nto :l nlAlr" pUl Ihe
zinc yOIl intlnd lO diffol,~, firn broken to [,IIJII pleees.
Pour on il lix limes its w<Íghl of the .miolic "dd, low·
creJ as aboye ullcélcJ, ano fet the ma'raI H1 a fand·balh
gently hMed. The zine \\'tll diffolve entire~y, . without
any lediment. Th: neutml muall.c falt rclulllng from
tlltS diffolution rnaots into er)'tlals, whieh go by Ihe
naOle of ,"hil' vil,i,/, or vilrío/o/' ziJlc.
Zinc is dlffolvcd by Ihenilrons and marine aeids, mueh
in Ihe manner as by the vitriolic; excepl thA! the
martn. aeid does not toueh a hlaek, (pungy, rarcfied
m,lter, ",hieh it feparms from Ihe ztne. M. Hdlot
founu upon "ial that Ihis mmer is nOI mereury, anJ
thal .t cannot be reduecd tO ~ melallie fublt.nce.
A folutiun of zinc in the marine actd, being dinilled
to uryn.(s, yidus a fublimal.e on applying a , iolent hca!
tO il
\11 the aeids diffol ' e with eafe; nOI only zinc, bUI i"
flowm alfo; and thal nearly in th. f,lme 'Iu¡nuty, .lId
~ .th .lmol1 alllhe fame phenomena.
01. A R S E N le.
7'. ltll.n ¡J,fini([rol/l ¡" [tll,im. Z. re o, S/lIf/I.
Powon fOn1O eobah, whit. pyriles, Or ollter Hfeni·
cal m,tI 1$ Pnt Ihis po"'''er into ,t retort with a /hun
wlde ncck, IUling a full thild theru.r elllptJ. et your
Itlort In a rl:\'erbuJting (urn.tce¡ lutt on a rCC'f'iVf:r;
htal )our ,efftl uy tlegrees, lInd Ihe fire till
yllu Cee. powJer 11110 the neck of the r<tort.
1\ o<:p upthe fire in tlllS ,Iegree as lung .s the fublinMtion
lOnll!lUlS: ",hIn this l>cgtnS 10 naeken, lalfe your fi.e,
VUL . 11. 0.36. 3
s T R Y. 145
311d m,ke it as lIrong as the veffds will he",. Wh,"
rM!tioC more .feends, ICI it go out. On IInluti,,~ di"
Yelleh, you I'/ill lind in Ih. ree.iyer a litll••lit mc 111
the fllrm of a fine light [., ino. T he neck of the rcto. e
\\'tll he fllll uf white Ilowers, not'quite (o fine, fOllle o:
II'hich \\:ill .•ppca~ like liulc ; antl if a good de,d
of arltn.e be lubltmcd, a ponderolls m.tlcr, like a IVhite,
(emi 'l"nfparcllt gl"fs, will be fonnd ,t1her'ing tOIhal pan
of the neek uf Ihe "tOn whieh is next ilS hody.
\Vhen all the arf.oie the eob.11 will yit:lo is Ihll' f~.
p,tt'.IICJ, the earthy fixed mal lcr I. ft behiotl is lIli xe,1
with di" crs fllfible m,tlCrs and yittifi.d, anu pt'ouuers ,1
of beauliful uluc eolour. It is e.lkJ p llall. T his
gl. fs is Iu be preparcd in Ihe following m.•oner.
T,ke four pans of fine fu fiblc f:tnd . ao eqllal quaolily
of any lixed .Ikali pcrfellly depur md, ~nu o~e pa. l of
eob, lt (10m whieh the arfenic ha;h bccn..fuhlimed bv lar.
refaéli?n. Pul'eri!e lhefe dlO'l rCnt luldanm I'C. yr.nel"
and OIlX them Ihorou~hly to~t1hcr; ptll the mixture tn.
la ,t gouu crueible, coyer n, and fc1 it io arn.:lting furna,e.
M. ke , /lron2 hre, aod keep il up eonUantly io thc f.;r,e
degree for c,JIIle hours. Thco dip an iroo \Vire iOlo tl.e
erueible ; to Ihe cnu of whieh , glaffy Olduer will I!ick,
in the fOrtn of threads, if Ihe fulion and I'itrihcatioo b~
perfeél. 1n Ihis eafe Ilke the erueible Out of the fire .
eool il by throwillg water on il, aoJ Iheo bre.k il. Yo~
will finJ in il a gl, fl, which will be of ln (xce(d.n<o
deep bluc, and alOlolt black, if Ihe operalioo hdlh fue~
eeeded. This glafs, whcn redueed to a fine puwucr, a,;.
quires , mueh brighler aod Olore lil'ely blue eolour.
. 1f )'OU find afler the operation that Ihe glafs hath IDO
hule eolour, the fufian mun be repemd a.fecond lime,
willl I",iee or Ih riee I"e quantilY of cobalto [f, 00 lhe
euntrary, Ihe be 100 d..k, lefs cobalt Olult be
ufcd.
[n order tu make the effa)'of , particular eob,lll, wilh
a Vlew la know wh'l quantity of bluc glals it will yield,
it is not nec, ffary to perform the opemion in Ihe manner
here (el clown; a gre:u deal of time "lid Irouulc may u~
fared by melttng one pm of eobalt ",ith 1\\ o or three
pms of borax. This fah is very fufible, and tnrrs,
IVhcn ",ehed, inlo a (ubflauee which, for l tillle, polI,,..
fes all th~ prope" ;es 01' gl,fs. In Ihis tri.1tho gl. ls oi'
bQrax tyill be nedrly of the (..me colollr as Ihe me ~Iar.,
or fmalt, made \~ith Ihe fame eobah.
1 he ores of uifmuth , as \Yell as cohall, )'ield a Olat.
ler Ihal colouls gl, (s blue; nay, Ihe fmalt m. de wllh
thofe ores ts mOre beauti!'ul Ihan lhat r'ocured from Ihe
orc of purc ...r. nie. Somc c"balts yielJ both ar:i:oie anel
bifnluth. When fueh eob,"" are u(ed, it is eommoo 10
fi..u . t the bouul11 of tite eru.:ibl"alittle bunon 01 n;mll,e
maner, whieh ii callcd ,(gu!,,, o/' " h'/I. This rr,~u·
lus is a fort of bifmulh, generally aclultew ed wll h a
mixlure o( f. rruAinoos and arCeoieal pUlS.
The heavicn and moti fi cd Oowers of arfenie. rrocu.
red from cou,ll, Iw 'c hkcwlfe the plopeny of a
blue eolour 10 I,Cs. BUI IhlS eolour .s f,int : tt IS 011'.
ing la a poruon uf the colnuringmmer tal ri:d up ¡long
"'\lit tite rfenie. Thcfe flowm mal' he macle ao in~r<.
u,"nt in Ihe eompofiuun of biue gl. ls, nOI only beeaufe
of Ihe colouring principie Ihey cvolaio, bUI Jlfo becoul.
t : O th.y