IMPROVEMENTS IN STEAM GENERATORS
Year: 1869

page_text: ETTERS PATENT to Henry Allason Fletcher, of the Lowca Engine
Works, near Whitehaven, for the Invention of "IMPROVEMENTS IN
STEAM GENERATORS."
Sealed the 7th September 1869, and dated the 2nd April 1869.
PROVISIONAL SPECIFICATION left by the said Henry Allason Fletcher
at the Office of the Commissioners of Patents, with his Petition,
on the 2nd April 1869.
I, HENRY ALLASON FLETCHER, of the Lowca Engine Works, near
Whitehaven, do hereby declare the nature of the said Invention for
"IMPROVEMENTS IN STEAM GENERATORS," to be as follows:-
This Invention relates to vertical boilers, and consists in attaching
round the sides of the fire-box or tube a series of conical water pockets
or thimbles closed at their inner converging ends and opening at their
outer or expanded ends through apertures made in the fire-box into the
water space surrounding the same. The heated gases and products of

page_text: combustion are thus caused to play or circulate round the water pockets
or thimbles before referred to, and owing to the greatly increased
heating surface thereby presented the generation of steam is much
facilitated,
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Henry Allason Fletcher in the Great Seal Patent
Office on the 29th September 1869.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, HENRY
ALLASON FLETCHER, of the Lowca Engine Works, near Whitehaven,
send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Second day of April, in the year of
our Lord One thousand eight hundred and sixty-nine, in the thirty-
second year of Her reign, did, for Herself, Her heirs and successors, give
and grant unto me, the said Henry Allason Fletcher, Her special
license that I, the said Henry Allason Fletcher, my executors,
administrators, and assigns, or such others as I, the said Henry
Allason Fletcher, my executors, administrators, or assigns, should at any
time agree with, and no others, from time to time and at all times there-
after 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 STEAM GENERATORS," upon the condition (amongst
others) that I, the said Henry Allason Fletcher, my executors or ad-
ministrators, by an instrument in writing under my hand and seal,
should particularly describe and ascertain the nature of the said In-
vention, 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 Henry Allason Fletcher, 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, reference being had to the accom-

page_text: panying Drawings, and to the letters and figures marked thereon, that
is to say :-
My said Invention relates to vertical boilers, and consists in attaching
round the sides of the fire-box or tube a series of conical water pockets
or thimbles closed at their inner converging ends and opening at their
outer or expanded ends through apertures made in the fire-box into
the water space surrounding the same. The heated gases and products
of combustion are thus caused to play or circulate round the water
pockets or thimbles before referred to, and owing to the greatly increased
heating surface thereby presented the generation of steam is much
facilitated.
And in order that my said Invention may be fully understood, I shall
now proceed more particularly to describe the same, and for that
purpose shall refer to the several Figures on the annexed Sheet of
Drawings, the same letters of reference indicating corresponding parts
in all the Figures.
Figure 1 of my Drawings represents a side elevation of my improved
boiler; Figure 2 is a vertical section of the same taken through the
centre of the fire-box; Figure 3 is a horizontal section taken along the
line 1-2, in Figure 2; and Figure 4 is a similar section taken along the
line 3-4, in the same Figure.
A is the shell of the boiler, and B the fire-box surrounded by the water
space C; round the sides of this fire-box and projecting into the internal
space thereof are fitted a number of conical water pockets or thimbles
D, D, which open at their enlarged ends into the water space C, and have
their inner or contracted ends closed as shown clearly by the Drawings;
these pockets or thimbles may be formed in any suitable manner;
practice I find that the best way to make them is to form each one
out of a flat plate of the proper shape, which is rolled up, welded, and
flanged so as to be readily rivetted to the fire-box. E is the fire-grate;
F, the ash-pit; G, the chimney; and H, the man-hole.
in
Having now described and particularly ascertained the nature of the
said Invention, and the manner in which the same is or may be used
or carried into effect, I would observe in conclusion that what I
consider to be novel and original, and therefore claim as the Invention
secured to me by the herein-before in part recited Letters Patent is,
the attaching of water cones or thimbles of the form described to the

page_text: sides of the fire-box or tube of a vertical boiler in the manner and for
the purpose herein-before described and illustrated by my Drawings.
In witness whereof, I, the said Henry Allason Fletcher, have to
this my Specification set my hand and seal, the Twenty-fourth
day of September One thousand eight hundred and sixty-nine.
HENRY ALLASON FLETCHER. (L.S.)