IMPROVE- MENTS IN THE PREPARATION OF MATERIALS USED FOR SIZEING, DRESSING, OR FINISHING YARNS OR THREADS, AND WOVEN FABRICS, APPLICABLE ALSO TO SIZEING PAPER
Year: 1860

page_text: LETTERS PATENT to Alexander McDougall, of Manchester, in the County
of Lancaster, Manufacturing Chemist, for the Invention of "IMPROVE-
MENTS IN THE PREPARATION OF MATERIALS USED FOR SIZEING, DRESSING, OR
FINISHING YARNS OR THREADS, AND WOVEN FABRICS, APPLICABLE ALSO TO
SIZEING PAPER."
Sealed the 17th July 1860, and dated the 21st January 1860.
PROVISIONAL SPECIFICATION left by the said Alexander M°Dougall,
at the Office of the Commissioners of Patents, with his Petition, on the
21st January 1860.
I, ALEXANDER M°DOUGALL, of Manchester, in the County of Lancaster,
Manufacturing Chemist, do hereby declare the nature of the said Invention
for "IMPROVEMENTS IN THE PREPARATION OF MATERIALS USED FOR SIZING, DRESS-
ING, OR FINISHING YARNS OR THREADS, AND WOVEN FABRICS, APPLICABLE ALSO TO
SIZING PAPER," to be as follows:-
I take steatite, soapstone, meerschaum; or an analogous compound of
silica and magnesia, and after it has been reduced to a fine powder, I mix it.
with the materials commonly used for sizing, dressing, or finishing.
:

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Alexander McDougall in the Great Seal Patent Office on
the 21st July 1860.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, ALEXANDER
MCDOUGALL, of Manchester, in the County of Lancaster, Manufacturing
Chemist, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twenty-first day of January, in the year of our Lord
One thousand eight hundred and sixty, in the twenty-third year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me,
the said Alexander McDougall, Her special license that I, the said Alexander
McDougall, my executors, administrators, and assigns, or such others as I,
the said Alexander McDougall, my 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 THE PREPARATION OF MATERIALS USED FOR SIZEING,
DRESSING, OR FINISHING YARNS OR THREADS, AND WOVEN FABRICS, APPLICABLE ALSO
TO SIZEING PAPER," upon the condition (amongst others) that I, the said
Alexander McDougall, by an instrument in writing under my hand and seal,
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.
MAW
T
ALD
11
declare the nature of my said Invention, and in what manner the same is
to be performed, to be particularly described and ascertained in and by the
following statement (that is to say) :-
According to my Invention I mix steatite, soapstone, meerschaum, or an
analogous compound of silica and magnesia (such as tale) in a finely divided
state, with the materials commonly used for sizeing, dressing, or finishing
yarns or threads and woven fabrics, and for sizeing paper. For example, in
preparing flour sizeing, I take one part by weight of the steatite or other such
substance, reduced to a fine powder, and agitate thoroughly with two parts
by weight of caustic alkali, at the strength of twenty degrees Twaddle (using
soda by preference), and then add one part by weight of flour. This mixture

page_text: I treat in the same manner in which the flour sizeing is commonly prepared
for use.
I have above stated certain proportions of the materials, but I do not limit
myself thereto, as they may be varied to suit the kinds of goods to be operated
upon, that which I claim, as secured to me under the above in part recited
Letters Patent, being the use of steatite, soapstone, meerschaum, or analogous
compound of silica and magnesia, for the purposes above set forth.
In witness whereof, I, the said Alexander M°Dougall, have here-
unto set my hand and seal, the Twenty-first day of July, in the year
of our Lord One thousand eight hundred and sixty.
Witness,
J. W. MOFFATT,
66, Chancery Lane.
A. MCDOUGALL. (L.s.)