228 
Lead . 
When the white lead washed and drained, is of a pasty 
consistence, it is well ground between two mill- stones, 
and from the troughs that receive it, is carried to the dry- 
ing room to dry upon porous pans. When whiting is 
mixed with it (which is always the case) the whiting ought 
to be well washed in troughs to carry off the dirty part : 
then it ought to subside, and the water drained away. 
Then it should be washed again for the coarser and sandy 
parts of the whiting to subside, and the finer parts of the 
whiting only should be taken, and a second time ( after 
being mixed with the white lead as well as possible in the 
troughs) passed with the lead in a state of mixture through 
the mill-stones. Then dried together in the stove room. 
From the stove room, the lead is conveyed to the store 
room, and thence to the packing room. 
Such is the common method of making white lead ; a 
process sufficiently complex, troublesome, and unscienti- 
fic. The substitution of tanner’s bark for dung, is an 
improvement in respect to cleanliness, but I do not know 
that it is superior in any other way. 
The substitution of a stove, whose flues might be con- 
veyed among the pots, or the heat of the room kept up to 
the necessary degree, regulated by two or three thermome- 
ters, would in my opinion be a considerable improve- 
ment. 
But when I went through the vinegar manufactories of 
England, I was struck with the obvious application of the 
processes there used, to the manufactories of white lead 
and of verdigrease : and I propose it without hesitation to 
the manufacturers here, as a combination of processes that 
cannot but prove economical and lucrative. I do not ex- 
pect however that it will be put in practice, till on reading 
this, some speculator in patent rights, will take out a pa- 
tent for it, and swear in the usual way that he is the true 
and original inventor. I have already detailed a process 
