43 
Copper . 
the sulphuret. Much Valuable matter appeared to me to 
be washed away. Much blue vitriol (suiphat of copper) 
and much green vitriol, (suiphat of iron) might be made 
there ; but the copper is usually precipitated from the cop- 
per water, by immersing bars of iron in it.. 
In my time, they did not save the sulphur, but let it 
burn away. A few years afterward, Mr. Thomas Henry 
of Manchester, elder brother of Dr. William Henry the 
chemist, went to Anglesea, to contract for the sulphur 
that might be saved by roasting the ore with an append- 
age of long flues, and a chamber to save the sulphur sub- 
limed, which he proposed to introduce. But the scheme 
did not answer to. him . I believe the sulphur contain- 
ed some arsenic, which rendered it unlit for the oil of 
vitriol manufactory. 
Mr. T, Henry afterward died in South America, as a 
supercargo for Nickiin and Griffith of Philadelphia. 
The following account by Mr. Arthur Aikin, who was 
at Anglesea in 1796 coincides with my own. 
Process . — The ore is got from the mine by blasting ; 
after which it is broken into smaller pieces by the hammer 
(this being chiefly done by women and children), and 
piled into a kiln* to which is attached by flues a long sul- 
phur chamber. It is now covered close ; a little fire is 
applied in different places, and the whole mass becomes 
gradually kindled; the sulphur sublimes to the top of 
the kiln, whence the flues convey it to the chamber ap- 
pointed for its reception. This smouldering heat is kept 
up for six months, during which the sulphur chamber is 
cleared four times, at the expiration of which period the 
ore is sufficiently roasted.. The poorest of this, that is, 
such as contains from one and a fourth to two per cent, of 
metal, is then conveyed to the smelting-houses at Ami- 
wch-port ; the rest is sent to the company’s furnaces at 
Swansea and Stanley near Liverpool. The greater part 
