CERTAIN IMPROVEMENTS IN THE CONSTRUCTION OF BOILERS OR STEAM GENERATORS
Year: 1868

page_text: LETTERS PATENT to Thomas Blocksage, of Dukinfield, in the County
of Chester, Brick Manufacturer, for the Invention of "CERTAIN
IMPROVEMENTS IN THE CONSTRUCTION OF BOILERS OR STEAM GENERATORS."
Sealed the 21st August 1868, and dated the 27th February 1868.
PROVISIONAL SPECIFICATION left by the said Thomas Blocksage at
the Office of the Commissioners of Patents, with his Petition, on
the 27th February 1868.
I, THOMAS BLOCKSAGE, of Dukinfield, in the County of Chester, Brick
Manufacturer, do hereby declare the nature of the said Invention for
"CERTAIN IMPROVEMENTS IN THE CONSTRUCTION OF BOILERS OR STEAM GENERATORS,"
to be as follows:-
My Invention relates to all descriptions of boilers or steam generators
wherein internal flues or fire passages are employed, and is designed
to obtain a greater amount of heat from the fire passing along such
flues.
The improvements consist in dividing the flues or passages by a
horizontal or transverse partition extending across and from end to end
of the flues, and the said partitions may be of metal, fire-clay, or other

page_text: suitable material, and having either flat, convex, or other shaped
surfaces as may be found most effective; the object of such partitions
being to receive the dust and dirt and prevent it accumulating on the
bottom of the flue, (and so forming a non-conductor of heat), and also
by drawing the flame into the lower part to cause direct contact of the
flame with the bottom of the flue, so that as the heat naturally ascends
into the upper part an increased heat will be effected in the flue.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Thomas Blocksage in the Great Seal Patent Office
on the 26th August 1868.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, THOMAS
BLOCKSAGE, of Dukinfield, in the County of Chester, Brick Manufacturer,
send greeting.
WHEREAS Her most Eccellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-seventh day of February, in the
year of our Lord One thousand eight hundred and sixty-eight, in the
thirty-first year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said Thomas Blocksage, Her special licence,
that I, the said Thomas Blocksage, my executors, administrators, and
assigns, or such others as I, the said Thomas Blocksage, 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 the Isle of Man, an Invention for " CERTAIN IMPROVE-
MENTS IN THE CONSTRUCTION OF BOILERS OR STEAM GENERATORS," upon the
'condition (amongst others) that I, the said Thomas Blocksage, 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.
NOW KNOW YE, that I, the said Thomas Blocksage, do hereby declare
the nature of the said Invention, and in what manner the same is to

page_text: be performed, to be particularly described and ascertained in and by the
following statement :-
My Invention relates to that description of boilers wherein internal
flues are used, its object being to increase the effective heating power
of the boiler. I accomplish this by dividing the flue by a partition
extending across the flue and reaching from one end to within a short
distance of the furnace. This partition may be made of fire-clay or other
suitable material, and the surface may be either curved, flat, or other-
wise, but I prefer them to be made of fire-clay, and to have a curved
surface. The partition should be of sufficient width that when placed
in the flue it fits across the widest part, and rests on the curvature of
the flue, thereby dividing it into two equal or nearly equal portions.
The effect of this partition is to split the flames and the current of
heated gases into two portions, one passing through the upper portion
of the flue and the other through the lower portion. The flames are
thus caused to impinge more thoroughly upon all parts of the fluc,
and the water is thus enabled to take up a greater amount of heat than
with the ordinary flues, in which the lower portion generally remains
comparatively cool and ineffective.
In flues which have not this partition a large amount of deposit
arises from the soot falling on the bottom of the flue, where it forms a
thick layer of non-conducting material giving rise to a great loss of
heating power. The partition, however, prevents all the soot which is
formed in the upper portion of the flue from falling on the lower
portion. The deposit of soot on the lower portions of the fluc is thus
prevented from becoming so thick as it otherwise would become, and the
conducting power of the boiler is thereby improved.
In witness whereof, I, the said Thomas Blocksage, have hercunto
set my hand and seal, this Twenty-fifth day of August, in the
year of our Lord One thousand eight hundred and sixty-eight.