IMPROVEMENTS IN STEAM BOILERS OR GENERATORS
Year: 1874

page_text: LETTERS PATENT to William Arnold, of Barnsley, in the County of
York, for the Invention of "IMPROVEMENTS IN STEAM BOILERS OR
GENERATORS."
Sealed the 2nd April 1875, and dated the 12th October 1874.
PROVISIONAL SPECIFICATION left by the said William Arnold at the
Office of the Commissioners of Patents, with his Petition, on the
12th October 1874.
I, WILLIAM ARNOLD, of Barnsley, in the County of York, do hereby
declare the nature of the said Invention of "IMPROVEMENTS IN STEAM
BOILERS OR GENERATORS," to be as follows:-
:―
My Invention relates to improvements in high-pressure steam boilers,
whereby a more safe and economical working is obtained, which I effect
by a combination of small boilers or pipes made of boiler plate, and
such boilers or pipes so forming the fire-place should be set longitudinally
or otherwise and fired externally. All these pipes or boilers should be

page_text: joined together by means of wrought-iron junctions communicating with
each other.
Also by my Invention the placing of the fire-grate in internal flues of
boilers is dispensed with, same being placed at the front end under-
neath.
The pipes or boilers forming the fire-place can be easily connected to
a second part of boiler by means of wrought-iron junctions or cast-iron
expansions, communication pipes, or otherwise, so that one water gauge
and one steam gauge will regulate the whole. At the same time by my
arrangement the second part of boiler can be cross tubed in every ring
from one to the other, and by this arrangement uniformity of strength
is obtained, and the collapsing of the internal tubes in the second part
of boiler rendered impossible, as well as uniformity of expansion and
contraction is obtained.
I
The old bridge system is entirely done away with, as uniformity of
heating surface is obtained. I divide the ash-pit underneath the furnace
or grating, and by placing two folding doors at front end of fireing-place
the draught can be regulated at will, and by this arrangement they can
alternately draw the green fire over the red, and by these means consume
the greater part of smoke.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said William Arnold in the Great Seal Patent Office on
the 12th April 1875.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, WILLIAM
ARNOLD, of Barnsley, in the County of York, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twelfth day of October, in the year
of our Lord One thousand eight hundred and seventy-four, in the thirty-
eighth year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto the said William Arnold, Her special licence 8
that I, the said William Arnold, my executors, administrators, and
assigns, or such others as I, the said William Arnold, my executors,

page_text: iron junctions or cast-iron expansions, communication pipes, or otherwise,
so that one water gauge and one steam gauge will regulate the whole at
the same time by my arrangements. The second part of boiler can be
cross-tubed in every ring from one end to the other, and by this arrange-
ment uniformity of strength is obtained, and the collapsing of the 5
internal tubes in the second part of boiler rendered impossible, as well
as uniformity of expansion and contraction being obtained.
The small boilers or pipes are also applied vertically, forming upright
furnace boilers. In this arrangement the pipes or generators vary in
number according to the size of the boiler, and the draught is divided 1
by a. brick wall in the centre, conducting the flames,
Thus far I have described the object of my said Invention, and in
general terms intimated in what manner the same is to be performed,
and I will now in further compliance with the condition in said Letters
Patent contained describe the Invention in detail by reference to the 1
accompanying Drawings, as follows :—
Figure 2, front elevation; Figure 3, end elevation.
Figure 4 represents elevation of my boiler or generator arranged:
vertically.
In these Figures, A, small boilers or pipes; B, junctions connected to
the small boilers or pipes (A) to allow of free circulation between same;
C, furnace or fire-grate; D, furnace bars; E, furnace doors; F, ash-pit
fitted with folding doors (G) so as to regulate the draught to fire; G are
folding doors underneath fire-doors to regulate the draught and to draw
one fire over the other; Hare communication pipes or junctions between
small boilers (A) and second part of boiler (A¹); I are cross tubes in
second part of boiler; K, setting for boiler.
Having now particularly described and ascertained the nature of my
said Invention, and in what manner the same is to be performed or put
in practice, I hereby declare that I claim the herein described Invention
Improvements in Steam Boilers or Generators," as the same is
of "

page_text: herein-before set forth and described and illustrated by the accompanying
Drawings.
In witness whereof, I, the said William Arnold, have hereunto set
my hand and seal, this 9th day of April, in the year of our Lord
One thousand eight hundred and seventy-five.
Witness,
CHARLES BROADBENT,
Jordan Vale,
Barnsley.
WILLIAM ARNOLD. (L.S.)