IMPROVE- WADAD A CAZZE SALTA
Year: 1856

page_text: LETTERS PATENT to John Williamson and James Cochran Stevenson, of
South Shields, Alkali Manufacturers, for the Invention of "IMPROVE-
WADAD A CAZZE SALTA"
Sealed the 19th December 1856, and dated the 2nd July 1856.
PROVISIONAL SPECIFICATION left by the said John Williamson and
James Cochran Stevenson at the Office of the Commissioners of Patents,
with their Petition, on the 2nd July 1856.
We, JOHN WILLIAMSON and JAMES COCHRAN STEVENSON, of South Shields,
Alkali Manufacturers, do hereby declare the nature of the Invention for
"IMPROVEMENTS IN EVAPORATING SALINE SOLUTIONS," to be as follows:-
Our Invention has for its object the prevention of the incrustation of salts
on the heating surface of the evaporating vessel, when the same is heated by
fire applied to the sides of and not at the bottom of the evaporating vessel. In
the centre of the vessel or pan we place a vertical axis, to which are fixed
projecting arms which nearly reach but do not touch the sides of the pan, and
by the revolution of these arms we maintain a continuous circular motion in
the contents of the pan, thereby preventing the salts which are formed from
adhering to the sides of the vessel or pan. At some convenient place in the
pan or vessel a communication is made from the pan or vessel to another

page_text: pass.
vessel, through which the heated saline solution and the salts in suspension
The salts subside and the liquor returns through the same or another
communication to the evaporating pan or vessel. The salts are fished out of
the settling vessel by hand labour or any suitable mechanical means.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said John Williamson and James Cochran Stevenson in the Great
Seal Patent Office on the 2nd January 1857.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, JOHN
WILLIAMSON and JAMES COCHRAN STEVENSON, of South Shields, Alkali Manu-
facturers, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Second day of July, in the year of our Lord One
thousand eight hundred and fifty-six, in the twentieth year of Her reign,
did, for Herself, Her heirs and successors, give and grant unto us, the said
John Williamson and James Cochran Stevenson, Her special licence that we,
the said John Williamson and James Cochran Stevenson, our executors,
administrators, and assigns, or such others as we, the said John Williamson
and James Cochran Stevenson, our executors, administrators, and assigns,
should at any time agree with, and no others, from time to time and at
all times thereafter during the term therein expressed, should and lawfully
might make, use, exercise, and vend, within the United Kingdom of Great
Britain and Ireland, the Channel Islands, and Isle of Man, an Invention
for "IMPROVEMENTS IN EVAPORATING SALINE SOLUTIONS," upon the condition
(amongst others) that we, the said John Williamson and James Cochran
Stevenson, our executors or administrators, by an instrument in writing under
our or their hands and seals, or under the hand and seal of one of us or them,
should particularly describe and ascertain the nature of the said Invention, and
in what manner the same was to be performed, and cause the same to be
filed in the Great Seal Patent Office within six calendar months next and
immediately after the date of the said Letters Patent.
NOW KNOW YE, that I, the said James Cochran Stevenson, on behalf of
myself and the said John Williamson, do hereby declare the nature of the
said Invention, and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement
thereof, that is to say:-

page_text: moving power is communicated to the dredging apparatus by a belt working on
the sheave O. The pan A may be fitted with a close cover P, and the steam
formed by the evaporation conveyed away by a pipe Q, and used for drying
materials or heating solutions, or otherwise turned to account. R is a pipe
furnished with a regulating stop-cock for supplying the solution to the pan.
We have found that a velocity of the current of the solution of about six
feet per second round the sides of the pan is sufficient to prevent the adhesion
of the salts.
Having thus described the nature of our said Invention, and the manner of
performing the same, we would have it understood that we do not confine
ourselves to the precise details described; what we claim as our Invention
is the application of stirrers in combination with an evaporating vessel heated
at its sides, and having a settling vessel K for collecting the salts, as herein
described.
In witness whereof, I, the said James Cochran Stevenson, have hereunto
set my hand and seal, this Twenty-ninth day of December, in the year
of our Lord One thousand eight hundred and fifty-six.
Witness,
JA CARLYLE, Jun'.
JAMES C. STEVENSON. (L.8.)