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2938. On the Affaying of Iron Ores, &e. 
accurate and extenfive knowledge of the analogy of thefe res 
_ fults with thofe in the blaft-furnace. 
TABLE of PROPORTIONS of FLUXES. 
Let the earthy part of an argillaceous ore be compofed of 
clay 9, lime 6, fand 3 = 18. 
To affay 4 troy ounces of thisore . - or 1920 grains, 
add 4 bottle glafs  — 1920 
3 chalk — 1440 | 
of charcoal — 240 
11> 5520 
Let the fecond variety of argillaceous ores contain, clay 10, — 
filex 7, lime 3 = 20, 
In this cafe, 4 ounces troy of ore - or 1920 grains, — 
would require 4- - bottle glafs — 192° | 
4 chalk — 1920 . 
o% —— charcoal — 360 . 
122 ; 6120 | 
Let the firft variety of the calcareous genus of iron-ftone 
be fuppofed to contain, of earthy mixtures, lime 14, clay 65 — 
filex 4 = 24. 4 
When this iron-ftone is to ba affayed, 
to 4 ounces troy - - or 1920 grainsy 
add 5 bottle glafs - — 2400 
a3, chalk — — 720 
of charcoal _—- — 360 
11t 5400 
Again, let the fecond variety of the calcareous genus be 
fuppofed to contain, lime 10, fand 6, clay 4 = 20. 
I would add to 4 troy ounces - or 4920 grains, — 
4 bottle glafs — 1920 
2 chalk — 960 
ot charcoal -— 240° 
1O; 5040 
