( ^34 > 
it with (Tmple Water, feveral Times in a Day, which 
will dill aft quicker by diffolving Sal-armoniack in it. 
In thofe Countries where the Pyrites is common, the 
Vitriol ick Waters will fcale them foon enough, which 
are almod as cheap as common Water : You need only 
heap the Pyrites together, and leaving them to moulder 
in the Air, make afterwards a Lixivium with them and 
common Water, which Lie will have the defired Effect : 
But as the Leaves of Iron are fendbly much ealier cleanf- 
ed on one Side than the other, the bad Side rarely 
taking the brilliant Polifh in the tinning, but having 
always fome Spots, which proceeds in that in the beat- 
ing one Side is more expofed to the Adion of the Ham- 
mer, and is therefore better plained, the Author again 
advifes not to deep them, but only to moiden them, in 
order to make them rud, whereby you need moi- 
den that Side only that wants it mod: Whereas 
if you deep them, as the bad Side will take double 
or triple the Time of the other, the acid Mendruum 
will diffolve the Surface, and occalion a Lofs of Iron. 
He next gives two Cautions neceffary to be followed : 
the fird is in the Management of the Plates before they 
come to be prepared ; which is in the beating of them, 
to change the Place of each in its Turn, that every 
one may receive the immediate Adion of the Hammer, 
otherwife they will not extend equally : the fecond is 
to deep them in Clay or Fuller’s earth tempered with 
Water before you heat them, to prevent their foldering 
with one another. He then clofes this Part of the Ope- 
ration with remarking that whatfoever of thefe Me- 
thods are pitched upon, whether the old one, of which 
he has learnt the Secret, op any of the new,, which he 
has here (hewn, it i9 abfolutely neceffary after the Plates 
- rV ‘ are' 
