And this Paragraph, by right, ought to have been omitted, for it is not
worth Ten R. Dollers, requiring no Art in the making it; and I my self
taught it many years since, as well in the First part of the Mineral
Work, as in the Fourth part of my Furnaces; and it is made by _Regulus_
of Antimony, of which one part is mix’d with 12 parts of melted Tin,
and no more, for otherwise the Tin would be made brittle, and rendered
unuseful; rather if one part of _Regulus_ is mingled with twenty parts
of melted Tin, it will come out hard enough. And farther, it may as
well and rightly be made of _Zink_, as by _Regulus_ of Antimony, and
needing no great matter of Labour, melts sooner than _Regulus_ of
Antimony.