IMPROVEMENTS IN MADDER DYEING
Year: 1871

page_text: LETTERS PATENT to Alexander Campbell Duncan and Archibald
Duncan, of the City of Manchester, in the County of Lancaster,
for the Invention of "IMPROVEMENTS IN MADDER DYEING."
Sealed the 12th April 1872, and dated the 14th October 1871.
PROVISIONAL SPECIFICATION left by the said Alexander Campbell
Duncan and Archibald Duncan at the Office of the Commissioners
of Patents, with their Petition, on the 14th October 1871.
We, ALEXANDER CAMPBELL DUNCAN and ARCHIBALD DUNCAN, of the
City of Manchester, in the County of Lancaster, do hereby declare the
nature of the said Invention for "IMPROVEMENTS IN MADDER DYEING," to be
as follows:
-
This Invention consists,
First. In passing the goods through the dye liquor open or at full
width, so that the surface of the goods is at once and equally exposed to
the action of the coloring matter instead of passing them through in a
mass or rope-like state as at present.
Secondly. Instead of dyeing with the liquor at a low temperature at
the commencement and gradually increasing in intensity as now done,
we pass the goods through the hot water containing the coloring matter
First. In passing the goods through the dye liquor open or at full
width, so that the surface of the goods is at once and equally exposed to
the action of the coloring matter instead of passing them through in a
mass or rope-like state as at present.
Secondly. Instead of dyeing with the liquor at a low temperature at
the commencement and gradually increasing in intensity as now done,
we pass the goods through the hot water containing the coloring matter

page_text: of madder or artificial alizarine heated to as high a temperature as
convenient; the higher the temperature of the liquor the more rapidly
is the dyeing effected.
By these improvements a great saving of time is effected, as whereas
the ordinary process of madder dyeing now in use occupies from one 5
and a half to three hours, by our improved process the operation is
effected in from three to fifteen minutes, according to circumstances.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Alexander Campbell Duncan and Archibald
Duncan in the Great Scal Patent Office on the 13th April 1872.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, ALEXANDER
CAMPBELL DUNCAN and ARCHIBald Duncan, of the City of Manchester,
in the County of Lancaster, send greeting.
1
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Fourteenth day of October, in the
year of our Lord One thousand eight hundred and seventy-one, in the
thirty-fifth year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto us, the said Alexander Campbell Duncan and
Archibald Duncan, Her special license that we, the said Alexander
Campbell Duncan and Archibald Duncan, our executors, administrators,
and assigns, or such others as we, the said Alexander Campbell
Duncan and Archibald Duncan, 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 MADDER DYEING,” upon
the condition, amongst others, that we, the said Alexander Campbell
Duncan and Archibald Duncan, by an instrument in writing under our
hands and seals, or under the hand and scal of one of us, 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.

page_text: NOW KNOW YE, that we, the said Alexander Campbell Duncan
and Archibald Duncan, do hereby declare the nature of our 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 :—
First. In passing the goods through the dye liquor open or at full
width, so that the surface of the goods is at once and equally exposed
to the action of the coloring matter instead of passing them through in
a mass or rope-like state as at present.
And, secondly. Instead of dyeing with the liquor at a low temperature
at the commencement and gradually increasing its intensity as now done,
we pass the goods through the hot water saturated with the coloring
coloring matter of madder or artificial alizarine heated to and kept at as
high a temperature as convenient; the higher the temperature of tho
liquor the more rapidly is the dyeing effected.
By these improvements we obtain a great saving of: time, as whereas
the ordinary process of madder dyeing now in use occupies from one
and a half to three hours, by our improved process the operation is
effected in from three to fifteen minutes, according to circumstances.
In witness thereof we, the said "Alexander Campbell Duncan and
Archibald Duncan, have hercunto set our hands and seals, the
Tenth day of April, One thousand eight hundred and seventy-
Signed, sealed, and delivered by the
before-named Alexander Campbell
Duncan and Archibald Duncan, in
the presence of
G. SEPTIMUS HUGHES,
Patent Agent,
ALEX. C. DUNCAN. (L.s.)
ARCHP. DUNCAN.
(L.S.)
Manchester.