IMPROVE- MENTS IN BOILERS FOR HOT WATER APPARATUS
Year: 1874

page_text: LETTERS PATENT to Robert Harlow, of Heaton Norris, in the
County of Lancaster, Engineer, for the Invention of "IMPROVE-
MENTS IN BOILERS FOR HOT WATER APPARATUS.”
Sealed the 24th November 1874, and dated the 26th May 1874,
PROVISIONAL SPECIFICATION left by the said Robert Harlow at
the Office of the Commissioners of Patents, with his Petition, on
the 26th May 1874. .
I, ROBERT HARLOW, of Heaton Norris, in the County of Lancaster,
Engineer, do hereby declare the nature of the said Invention for
"IMPROVEMENTS IN BOILERS FOR HOT WATER APPARATUS," to be as follows:-
I construct an annular conical vessel or casing of welded or riveted
iron or copper, or a combination of the two, or of any other suitable
metal. The base of the cone is occupied by the fire-bars. Over the
open apex of this annular conical casing is a hollow deflecting plate
or cover (constructed of similar materials) the interior of which
communicates with the annular space of the conical casing by means of
two or more tubes riveted or otherwise fastened to the highest part of

page_text: the annular conical casing and the lower side of the hollow deflecting
plate. This deflecting plate is extended downwards around the outside
of the annular conical casing herein-before described, and at its lowest
point is again connected to such annular conical casing by tubes similar
to those described for the purpose of assisting the circulation of the
water which fills the whole interior of the deflecting plate and the
annular space of the conical casing or vessel. In the centre of this
deflecting plate is an opening for the insertion of a feed hopper, self-
acting or otherwise, the sides of this opening being extended downwards
into the interior of the annular conical casing, such extension forming
part of the hopper, and at the same time giving an extension of heating
surface at a part of the boiler where the heat is most intensc.
The whole of the boiler thus constructed is enclosed in brickwork,
suitable space being left around the outside of the downward extension
of the deflecting plate to form the fluc. When in action the flame and
heated products of combustion first rise along the interior of the annular
conical casing, they then impinge upon the deflecting plate and con-
necting tubes, whence they take a downward course through, the space left
between the outside of the annular conical vessel or casing and the insido
of the downward extension of the deflecting plate, past the tubes con-
necting its lower end with the conical casing, and finally up the outside
of such deflecting plate to the chimney shaft, by which time the greater
part of the heat has been absorbed by the boiler.
The usual flow and return pipes are respectively connected to the top
of the hollow deflecting plate and the lower part of the annular conical

page_text: WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-sixth day of May, in the year of
our Lord One thousand eight hundred and seventy-four, in the thirty-.
seventh year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said Robert Harlow, Her special licence,
that I, the said Robert Harlow, my exccutors, administrators, and
assigns, or such others as I, the said Robert Harlow, 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
BOILERS FOR HOT WATER APPARATUS," upon the condition (amongst
others) that I, the said Robert Harlow, my executors or administrators,
by an instrument in writing under my, or their, or one of their
hands and seals, 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 Robert Harlow, do hereby
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, and by reference to the accompanying
Drawing, representing in Fig. 1 a vertical section of my improved con-
struction of boiler, and in Fig. 2 a sectional plan of Fig. 1 through the
line a, b; both views are drawn to a scale of about three inches to the
foot.
In carrying out my Invention I construct an annular conical vessel
or casing A of welded or riveted iron plates, or of copper plates, or even
of cast iron. The base of the cone is occupied by the fire-bars B. Over
the open apex of the casing A; I arrange a hollow deflecting plate or
cover C (constructed of similar material to the casing A) the interior of
which communicates with the internal annular space of the casing A by
means of two or more connecting tubes D, riveted, socketed, or otherwise
secured between the highest part of the casing A and the lower part of
the hollow deflecting cover C. This deflecting cover C thus forms part-
of the boiler proper, being extended downwards around the outside of
.

page_text: the annular casing A, as illustrated, and at its lowest point being again
connected to the annular casing A by branching into the return pipes E,
for the purpose of promoting a circulation of the water which fills both
the casing A and the deflecting cover C. Through the centre of tho
deflecting cover C an opening C¹ is formed for the insertion of a feed
hopper, self-feeding or otherwise, or through which opening the boiler
may be supplied with fuel, the sides C2 of such of opening being extended
downwards into the interior of the annular casing, and such extension C³
forming part of the hopper and at the same time giving an extension
of heating surface at a part of the boiler where the heat is most

page_text: -
substantially as and for the purpose herein-before described and
illustrated on the accompanying Drawing.
In witness whereof, I, the said Robert Harlow, have hereunto
set my hand and seal, this Twenty-fourth day of November, in
the year of our Lord One thousand eight hundred and seventy-
four.
ROBERT HARLOW. (L.S.)