224 
Lead \ 
bedded in dung, that it may be a fair specimen of the ge~ 
ixeral progress of the pots throughout the under tiers, 
which cannot be got at so easily. The stacks are taken 
down when the vinegar is evaporated, and the lead is car- 
ried into 
The mill room . Here, the hardest, whitest, and most 
sonorous pieces of lead, are picked off and selected for 
the pigment usually as flake white ; which is generally 
pure white lead unadulterated : and which may therefore 
serve as a comparison to ascertain the quantity of adulte- 
ration in common white lead. 
The corroded plates are then run through the grooved 
rollers, and scraped. This is a very unwholesome part of 
the process. The men concerned in it, become paralytic 
in three or four years. An improvement has been made 
by a Mr. Archer Ward, in this part of the manufacture, 
which, although Dr. Coxe has copied it in the second 
volume of his series of the Emporium, and Mr. Cutbush 
also has copied it in his useful work entitled the Ameri- 
can Artists Manual, yet, as I do not wish to send my 
readers hunting after processes to be found in other books, 
I chuse to copy it also in this. My plan being to accu- 
mulate all the useful information I can upon each subject, 
in one connected view : I am therefore not deterred by 
now and then a little repetition, or the insertion of papers 
which other works have stolen, before it came to my turn 
to pillage the rich store-houses of European information. 
Mr. Archer Ward’s account of his improvement is as 
follows* 
Description of a method of preventing injury to the health 
of the workmen employed in preparing White Lead. 
By Mr . Archer Ward , in his own words : 
IN order to explain, as well as I can, the advantages 
that will accrue to the workmen by adopting my invert- 
