i8o N A T U R A L H I S T O R Y
the other at the foot, |by.'flipping ;the flake jfbfoh fuppqr6ed/fl>£1j
turned e a f# from horizontal to M I W W W
remained on the frame, runs off,
ling, into a wooden cheft, gjcadlgd * f p f t e ™
readyto receive i t ; the frame is j&m
pofition, and the fame procefs repeated, till thg-^ffer is . f u l l t h e
«intents are,then carried to the. keeve N, ^here th e y .^ .tp Ze4
fifted, and packed; the ore is then carried baefe again to the,frame,
W, and cozed, which is performedby ftopping;.the loweyend of
the frame with flime and turf that .the water may be quite lhll, and
the tin more eafily fettle upon the frame, an^defceiid -the more
furely into the coffer ;,;the coffer is then, emptied 'the Jecond^time;
the tin carried again to the ; keeve, there tozed, fkimmed, :and
packed ; and thus the flimes are flnifhed,: and,-brought-to as great
a degree of purity as the fize of the tin ,(whiqhf ,
finall, will necefiarily have fomewhat more <^wafl.th^n-wbat.#
larger and heavier) will permit. £ • ■ ?i -
Thus proceeding only upon this fingle principle, that the tofee
of water, properly applied and introdupedvlam i^ # ^ ^ e l e s \m
me-and the fordes mixed with it, will
leave the former at reft for them to cofle#
vary their operations
fcffening, increafing, difihfing, or contraamgitgeir w a^ .( t^ ;g re^
inftrument of purity), as the
metal and its feeders do require; indeed,, itd spjw ptfe fe^
what eafe, cheapnefs, and r e g q l ^ ^ t ^ . ^ ^ e ^ Q ^ S ; . ^ ?
.performed. ,
It muft here be remembered, that mundie^apd foniefOJflfgjieml-
metals, being fpecifically heavier .thaii the tin; wh^ev^ m ~ m k
incorporated with thefe muft firff be burnt,
evaporated, and then, and no.t ; oth.erwife, ;\viU. the ^ater _,Wafh
away the remains of the femimetal, and leavq.tbe ffn behind. Tlji?
bufinefs o i dreffing is a particular trade, entirely different, from that
of the labouring miner, and is beft learned under a ;m?fler-work-
ynan, who makes it his foie occupation to follow, the ftamping-mijl,
and the works belonging thereto. This mafter-workman hires boys
from feven or eight years old to eighteen,, givef/the former about
three fhillings a month, and raifes their wages as they advance in
age and workmanfhip, till they have man’s wages, at the leaft
twenty-four fhillings, at the higheft thirty fhillings per month.
This is of double benefit to the poor parents; the boys being taken
in fo young become healthy and hardy by ufing themfelves to cold,
and to work with wet feet all day; and, zdly, they learn early to contribute
to their own maintenance. Each ftamping-mill, which has
conftapt
o e a o r n # a l l . p§t
confiant work a r i d « * , will employ brie man and five bSys ; and
one hundred fàcks (each fack containing twelve gàîlôiis) 'afe ftamped,
wàflied, and fitted For melting at the rate of fix-pence 'per lack (dr
fifty Ming's jwy#ntirèd) f f l g n fbm|Mat, adcdfe&g-to the
- quality aff^th|iéi, in' fhe fpdee' of à few days; - Tor bruifing tHe
titttorë: into à Ën#^b$dér, the Mz&g-mtU (Cfrew,
: page 12) after ^the orb wis " ftampéd, an érigihé; not much
Uhlikie th# p r e fe r gtift-ihill ; M M H tîbttbîôHîh -Wdtet
ÉSMËdifëti ^ « i f^ èlél&f- id v ë t e or ihipr^i&lWis much
füorfe^effëdxiâ-l m0ne 'the wat&' ftStóf)iHg-mil{ hé>è è xk lb tó ; W : a$
it Ö%ht fefvê all 0ipofes} ‘éÊéêlêWtitt haê:ti$ïÿe$k fificé dffiffèdi
• 1 Tm?,' \ïë^^Ê^ffèdy.is êarriéd in Öcjks ukdéŸ tfie £éd&à$ name dfsECT.xvm.
Black-tiff (thöögh What is caBéd FiamC-thi is ûMÜf J^ ÿ e lfô v y - Of waring
iffr edrthy colour, ind forne otter riuddy'Btbwh, W& élMè (^ èW
©US âffd: Whitifc')' t o ^ é melSr^hoüfö fiorfcs,1 each fiorfe ëaî-
pâng?âbëéî CbreC hundred pounds' weight?. Éfefê, f fe brdtigfic
is fiïff afîàyed; iff--order to which, éitilër the wliolë pafcd i,s' emp-
tSed into * cfoan timber huddles,J arid there well mixed1,‘ of a 'little
out of ev^^ lack- is tâkén; By the aflaÿér, ahd wdlf tolled föfëtlicry
that fhë afiây of that? little parcel may afcertani the real quality of
the-whble : for it riiuft' Be "obfervedi that àfthdùgh ' thé1 procefs. óf
a â f ^ i c ÿ t s ' this cleanfiSg
ah^pss by the name of Black-tin,- yet each'parcel of evèry vyöfk
msf- be of different value,- according as it is nioifc or* Jbfs fkilfully
direfiëd, ahd aeédèdin^f- aP the different w^efi
oö^porated "^is.'eifher''^rcffloÎB3dr Öbüatè^tHe itifiihi ^.'the^metrf.
P Ü V | blacà-titi- thérfefordî!i# lÿ ^ all; ^ thenÖ ^ vri<hnièff
ant yields alike,” as Dr. Woodward s was informed, is^a'great mi-
flaké.- Kal, for inftahee, viz. wdld-irbn, is rfeckohed to mix well,
aiid melt kindly> with tin-ore, and indreaffes the quantity o f .melted
tin in a gréSteF proportion than the qddft^ is thereby'débafëd, ai'
We find-by that? of HueEboyS mine iii St. Juft, atld that ’o f other-
jdàces ; fuch ore will therefore yield orfe^'qüàrtef dfrh ; twentieth '
part more than ore of a much finer appearance to the eye. The ;
melter is not paid in môheyffor melting the tin brought, but by*'
allotment of fuch ai fhare twenty : fgr the charges of cqals, labour,
and utenfils, expended in the fufion, the melter has ufually
j|, the other twelve in twenty parts remaining to the owner : forne
tin however will bring the-'oi^fièr twelve and a half anfl jhjÿtièen■“
out of twenty, which is the moft'that is given : on the other hand,
forne black tin has fuch a quantity of other metal, or of its own
ftubborn feeder adhering to it, that" it will not bring more than
* Càtàlbgüëj völ.' II. page g ri m. a6.'
A a a eight