220 
Lead . 
I proceed then-, to give an account of the common me- 
thod of making white leach Premising 
1st. That it is necessary to set up the manufacture 
where good water is to be had in plenty : water contain- 
ing hydrogenous, sulphureous or carbonaceous gas or 
Salts, would spoil the colour. 
2dly, It is desirable that fuel should be cheap, though 
this is not necessary : and that horse dung or bark 
should be of easy purchase. 
3dly, There must be room and space for the manufac- 
ture. The person undertaking it in the common way, 
will need, at least, the following buildings : 
A brewhouse for brewing vinegar from damaged 
grain. 
A room for casting the lead into sheets ; and for roll- 
ing it into spirals. 
A smelting room, for recasting the refuse lead into blue 
lead again. These two rooms may be in one. 
The casting room, the rolling-up room, and the smelting 
room should be contiguous, and may open into each 
other. The smelting room must be furnished with a fire 
place and chimney, and have a strong cast iron pan set in 
a brickwork furnace, to melt the lead. The rolling-up 
room should have a bench under the windows from one 
end to the other. All the rooms but the smelting room 
may be warmed by stoves. 
A room for corroding the lead with vinegar. It should 
be of a good height, and the ground plan will depend on 
the quantity of business to be done. The stacks, or beds, 
may amount to six in height, more or less according to 
the size of the pots. 
A room for holding the troughs, and grooved cylin- 
ders, where the white lead is scraped from the blue lead. 
In this room, a pump should empty the contents of the 
first trough into others, after the water is well agitated ; 
