IMPROVEMENTS IN STEAM BOILERS."
Year: 1866

page_text: LETTERS PATENT to William King Hall, of Sheerness, in the County of
Kent, Captain in the Royal Navy, for the Invention of "IMPROVEMENTS
IN STEAM BOILERS."
PROVISIONAL SPECIFICATION left by the said William King Hall at the
Office of the Commissioners of Patents, with his Petition, on the 20th
January 1866.
I, WILLIAM KING HALL, of Sheerness, in the County of Kent, Captain in
the Royal Navy, do hereby declare the nature of the said Invention for
"IMPROVEMENTS IN STEAM BOILERS," to be as follows:-
My Invention consists in constructing steam boilers with vertical tubes
passing through the furnaces; the portion of such tubes between the top of
the furnaces and the water line is conical, the broader diameter being upper.
most, while the portion of the tubes which passes through the furnaces is by
preference of uniform diameter and oval.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said William King Hall in the Great Seal Patent Office on
the 20th July 1866.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, WILLIAM
KING HALL, of Sheerness, in the County of Kent, Captain in the Royal
Navy, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twentieth day of January, in the year of our Lord
One thousand eight hundred and sixty-six, in the twenty-ninth year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me, the
said William King Hall, Her special licence that I, the said William King
Hall, my executors, administrators, and assigns, or such others as I, the said
William King Hall, my executors, administrators, and 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 "IMPROVE-
MENTS IN STEAM BOILERS," upon the condition (amongst others) that I, the
said William King Hall, 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 William King Hall, do hereby declare
the nature of my said Invention, and in what manner the same is to be 'per-
formed, to be particularly described and ascertained in and by the following
statement thereof, reference being had to the Drawings hereunto annexed,
that is to say :-
My, Invention consists in constructing steam boilers with vertical tubes.
passing through the furnaces'; the portion of such tubes between the top of
the furnaces and the water line is conical, the broader diameter being upper-
most, while the portion of the tubes which passes through the furnaces is by
preference of uniform diameter and oval.
Figure 1 of the accompanying Drawings is a section through the line x, x,
of Figure 3; Figure 2, a section through the line y, y, of Figure 3;

page_text: and Figure 3 is a plan of a steam boiler constructed according to my
Invention.
A, A, is the outer casing of the boiler, and B, B, are the inner casings or
fire-boxes; C, C, are the furnaces, and D, D, the furnace bars; E is tho
Alue or passage by which the products of combustion are carried to the
uptake F.
I construct the boilers with vertical tubes G, G, which pass through the
furnaces as shown. The portion of these tubes from a to b, that is to say,
from the top of the furnaces C, C, and the water line is conical, the broader
diameter being uppermost, and the portion of the tubes G, G, which passes
through the furnace is, by preference, of uniform diameter, as represented in
the Drawings, and may be of circular, oval, or other desired shape in section.
The tubes G, G, are secured at the bottom to the bottom of the inner
casings B by means of flanged rings H, H, and at the top to the top of the
inner casings by similar rings, or they may be secured in any other convenient
manner; they are protected from the direct action of the fire by fire-bricks
I, I, J, J, are forked stays between the top of the outer casing A and
the top of the inner casings; K, K, are horizontal stays fitted at various parts
as required. The water has free circulation between the outer casing A and
the inner casings or fire-boxes B, B, also between these fire-boxes and
through the tubes G, G. The flame and products of combustion surround
the conical portions of the tubes G, G, and then pass through the flue E into
the uptake F.
Boilers constructed according to my Invention occupy much less space than
ordinary multitubular boilers, and the advantago is thus derived of being able
to fit, say, 8 boilers on board a vessel in the space now occupied by four
ordinary boilers.
I do not limit myself to the arrangement herein-before described and repre-
sented in the Drawings of the outer and inner casings, or of the flues and
uptake, as they will be varied to suit the particular purpose for which the
boiler is required.
And having now described the nature of my said Invention, and in what
manner the same is to be performed, I declare that I claim,―
First, constructing steam boilers with vertical tubes passing through the
furnaces, the portion of such tubes between the top of the furnaces and the
water line-being conical, substantially as herein-before described and repre-
sented in the accompanying Drawings.
Second, the employment in steam boilers of tubes, one portion of which is

page_text: conical and another portion parallel, substantially as herein-before described
and represented in the accompanying Drawings.
In witness whereof, I, the said William King Hall, have hereunto set
my hand and seal, this Nineteenth day of July, One thousand eight
hundred and sixty-six.
WILLIAM KING HALL. (L.S.)