532 INQUIRY INTO THE STRENGTH 
The Ystalyfera ores are reduced in the same 
manner as those at Yniscedwyn, chiefly or entirely 
by anthracite coal in the raw state. The process 
is as nearly as possible, the same as that used at - 
coke furnaces, the charge being, coal, 5 cwt., and 
mine (according to the working of the furnace, 
and the quality of iron to be produced), from 6 
to 8 cwt—the average proportion of limestone as 
flux—being nearly one-third of the quantity of 
mine used. 
Mr. Thomas Bevan, of the Ystalyfera works, in 
handing me specimens of the iron ore, stated that 
he attaches no importance to the specific gravity 
of the minerals. Some of the ores have, however, 
been analyzed, three of which are as follows— 
No. 1, Specific Gravity, 3.358, yielding iron 28.70 per cent. 
2, : * 3.417, §) » 20.35 9 
3, 95 5 3.521, a3 9 38.5055; 
From the above it will be seen that although 
the specific gravity of all the specimens is nearly 
alike, yet the degree of richness varies consider- 
ably; No. 3 specimen yielding nearly double 
the quantity of iron to No. 2. 
The analysis of the specimens sent by Mr. 
Bevan, is as annexed. 
