( ^755 \ 
This Powder is afterwards put into a low and broad 
Furnace, made on purpofe to feparate the Sulphur and 
Arfentck ^ where th^ Powder is fpread all over, and the 
Fire, which h beneath and behind 'it, is forced topafsits 
flame along over the Powder, and fo to take along with 
St the Ajfetiick in form of a Smoak; which afterwards is 
rectiT*d by a low Chimney,, and cut of that carried in a 
clofe Channel made of Brick wall, of about 50 or more 
pacesj where the Arfenick by- the wayfticks to the Wall, 
in form of a White or Yellowifti Powder. The fame is 
taken out^every 6 months and melted into whole pieces. 
The Cohalt thus roafiedjaod fiiioaking little more, being 
red hot, is taken out, cooled again and gathered for melt- 
mg* Its C^?/i?i/r by that way of roaftiog is turned a little 
more whiti(h. 
When they hsve a mind to melt it, the Powder of the 
Cebah is mixed v^ ith Pot Afhes and Powder of White 
Flint Stones : The proportion of them is accordingto the 
goodnefsof the Ghalt, or as they will make the iW^/f of 
a deep or paler colour : For Example, they take one part 
of Pot Afhes, two parts of Cobalt^ and 5 or 4 parts of Flint. 
This Mixture is put into great ftrong Pots, fbanding in a 
hot Furnace 5 6 or 8 Pots in one Furnace 3 there it ftands 
a melting for 5 or 6 hours time, turning into a blue Glafi, 
which afterwards is taken out with a great Iron Spoon and 
put into a Veflel full of cold Water, where it cracketh 
and grows more tender, to be the more eafily powdered 
iigzin :■ But the empty pot in the Furnace is filled up again 
with the aforefaid miKture. And fo they continue night 
and day, not leaving off the fire in the Furnace. 
The blue Glafs taken out of the Water is powder- 
ed again by the ordinary Engine 5 the fined:, feparated 
by a Sieve, is put into a Mill, and grinded in Water 
into the fined Powder, which by wafliing is ftill feparated 
from the Courfer. 
The 
