CERTAIN IMPROVEMENTS IN STATIONARY STEAM BOILERS, AND IN THE FURNACES AND FLUES CONNECTED THEREWITH
Year: 1844

page_text: FAIRBAIRN AND HETHERINGTON'S SPECIFICATION..
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, WILLIAM
FAIRBAIRN and JOHN HETHERINGTON, both of Manchester, in the County o
Lancaster, Engineers, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent under the Great Seal of the United Kingdom of Great Britain
and Ireland, bearing date at Westminster, the Thirtieth day of April, in
the year of our Lord One. thousand eight hundred and forty-four, in the
seventh year of Her reign, did give and grant unto us, the said William Fair-
bairn, and John, Hetherington, our exors, admors, and assigns, Her especial
licence, full power, sole privilege and authority, that we, the said William
Fairbairn and John Hetherington, our exors, adñors, and assigns, and such
others as we, the said William Fairbairn. and John Hetherington, our exors,
admors, and assigns, should at any time agree with, and no others, from time
to time and at all times thereafter during the term of years therein mentioned,
should and lawfully might make, use, exercise, and vend, within England,
Wales, and the Town of Berwick upon Tweed, our Invention of "CERTAIN
IMPROVEMENTS IN STATIONARY STEAM BOILERS, AND IN THE FURNACES AND FLUES
CONNECTED THEREWITH" in which said Letters Patent there is contained a
proviso that we, the said William Fairbairn and John Hetherington, shall
particularly describe and ascertain the nature of our said Invention, and in what
"manner the same is to be performed, by an instrument in writing under our
hands and seals, to be enrolled in Her said Majesty's High Court of Chancery
within six calendar months next and immediately after the date of the said in

page_text: part recited Letters Patent, as reference being thereunto had, will more fully
and at large appear.
NOW KNOW YE, that in compliance with the said proviso, we the said
William Fairbairn and John Hetherington, do hereby declare the nature of our
Invention to consist in constructing stationary or land steam boilers, with two
large open tubes passing through each of them below the level of the water to
be contained therein, which tubes are parallel to each other, or nearly so, and
unite the front part to the back part of each of such boilers. These tubes are
of, sufficient capacity to admit of a furnace being placed in one end of each,
which end is made a little larger for that purpose, and the other part of the
tube acts as a flue, and communicates at the end of the boiler with the main
flue formed between the brickwork and the boiler. A small opening is left in
the bridge of each furnace, which admits a limited quantity of air from the
ash pit into the flue. By feeding each furnace alternately with a fresh supply
of fuel, the superfluous carbon from the fire last fed is burnt in the main flue
on meeting with the current from the other flue in the boiler, in consequence
of such current being at a higher temperature, from having left a clear or
glowing fire, whereby the products of combustion are almost invisible, and
whereby also less fuel is consumed.

page_text: passing through the water in the boiler, each of which tubes contains a fire,
and their mode of acting, as herein-before described.
In witness whereof, we, the said William Fairbairn and John Hetherington,
have hereunto set our hands and scals, this Twenty-ninth day of
October, in the year of our Lord One thousand eight hundred and
forty-four
W
(L.B.) FAIRBAIRN.
JOHN (L.S.) HETHERINGTON.
AND BE IT REMEMBERED, that on the Twenty-ninth day of October,
in the year of our Lord 1844, the aforesaid William Fairbairn and John
Hetherington came before our said Lady the Queen in Her Chancery, and
acknowledged the Specification aforesaid, and all and every thing 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.
T