A NEW PROCESS OF MAKING SULPHATE OF MAGNESIA, COMMONLY CALLED EPSOM SALTS
Year: 1828

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, I, WILLIAM
GRISENTHWAITE, of Nottingham, Esquire, send greeting.
WHEREAS His present most Excellent Majesty King George the Fourth,
by His Letters Patent under the Great Seal of Great Britain, bearing date at
Westminster, the Eleventh day of August, in the ninth year of His reign,
did, for Himself, His heirs and successors, give and grant unto me, the said
William Grisenthwaite, His especial licence that I, the said William
Grisenthwaite, my exors, adññors, and assigns; or such others as I, the said
William Grisenthwaite, my exors, adñiors, or assigns, should at any time agree
with, and no others, from time to time and at all times during the term of
years therein expressed, should and lawfully might make, use, exercise, and
vend, within England, Wales, and the Town of Berwick-upon-Tweed, my
Invention of "A NEW PROCESS OF MAKING SULPHATE OF MAGNESIA, COMMONLY
CALLED EPSOM SALTS;" in which said Letters Patent is contained a proviso
obliging me, the said William Grisenthwaite, by an instrument in writing
under my hand and seal, particular to describe and ascertain the nature of my
said Invention, and in what manner the same is to be performed, and to cause
the same to be inrolled in His said Majesty's High Court of Chancery within
six calendar months next and immediately after the date of the said recited
Letters Patent, as in and by the same, reference being thereunto had, will
more fully and at large appear.
NOW KNOW YE, that, in compliance with the said proviso, I, the said
William Grisenthwaite, do hereby declare the nature of my said Invention, and

page_text: the manner in which the same is to be performed, is ascertained in and by
the following description thereof, that is to say:--
My Invention of a new process of making sulphate of magnesia, commonly
called Epsom salts, consists in mixing together magnesia, sulphate of lime,
(the substance known by the names of plaster of Paris and gypsum, will answer
very well,) carbonic acid and water, until there is formed a sulphate of magnesia.
The magnesia I obtain either by precipitation from sea water, by the common
alkaline or earthy precipitants, or from the magnesian limestone, in which
latter case it is mixed with a portion of lime. The processes of evaporation
and crystallization used by me are similar to those employed by chemists. I
claim to be the first person that has ever used sulphate of lime and carbonic
acid in a process for preparing sulphate of magnesia.
In witness whereof, I, the said William Grisenthwaite, have hereunto
set my hand and seal, this Seventh day of February, in the year
of our Lord One thousand eight hundred and twenty-nine.
BRADSHAW, Extra.
(M.D.)
AND BE IT REMEMBERED, that on the Seventh day of February, in
the year of our Lord 1829, the aforesaid William Grisenthwaite, Esquire,
came before our said Lord the King in His Chancery, and acknowledged the
Specification aforesaid, and all and everything therein contained and specified,
in form above written. And also the Specification aforesaid was stamped
according to the tenor of the Statute made for that purpose.
Inrolled the Tenth day of February, in the year of our Lord One
thousand eight hundred and twenty-nine.