IMPROVEMENTS IN THE CONSTRUCTION OF BOILERS FOR GENERATING STEAM, AND IN THE APPLICATION OF STEAM TO MECHANICAL POWER
Year: 1841

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOHN
HALL, of Breezes Hill, Ratcliffe Highway, in the County of Middlesex, Sugar
Refiner, send greeting.
WHEREAS Her present most Excellent Majesty Queen Victoria, by Her
Royal Letters Patent under the Great Seal of Great Britain, bearing date at
Westminster, the Ninth day of December, in the fifth year of Her reign,
did, for Herself, Her heirs and successors, give and grant unto me, the said John
Hall, Her especial licence, full power, sole privilege and authority, that I,
the said John Hall, my exors, admors, and assigns, or such others as I, the
said John Hall, my exors, admors, or assigns, should at any time agree with,
and no others, from time to time and at all times during the term of years
therein expressed, should and lawfully might make, use, exercise, and vend,
within England, Wales, and the Town of Berwick upon Tweed, my Invention
of "IMPROVEMENTS IN THE CONSTRUCTION OF BOILERS FOR GENERATING STEAM, AND
IN THE APPLICATION OF STEAM TO MECHANICAL POWER;" in which said Letters
Patent is contained a proviso that I, the said John Hall, shall cause a par-
ticular description of the nature of my said Invention, and in what manner the
same is to be performed, to be inrolled in Her said Majesty's High Court of
Chancery within six calendar months next and immediately after the date of
the said in part recited Letters Patent, as in and by the same, reference being
thereunto had, will more fully and at large appear.
_NOW KNOW YE, that in compliance with the said proviso, I, the said
John Hall, do hereby declare that the nature of my said Invention, and the
manner in which the same is to be performed, are fully described and ascer-

page_text: tained in and by the following statement thereof, reference being had to the
Drawing hereunto annexed, and to the figures and letters marked thereon
(that is to say):
My Invention consists of constructing steam boilers of two or more parts,
in such manner that the parts can readily be separated one from the other,
in order to the more readily cleansing of the flues and tubes of such boilers.
And in order that my Invention may be most fully understood and carried into
effect, I will proceed to describe the Drawing hereunto annexed, in the
various figures of which the same letters are used to indicate similar parts.
DESCRIPTION OF THE DRAWING.
Figure 1 represents an external side elevation of a boiler constructed
according to my Invention, such boiler being composed of three separate
parts. Figure 2 is a plan thereof. Figure 3 shows a side section of the
boiler, the three parts of which it is composed being separated one from the
other. Figure 4 shews a plan of the boiler in section, with a Stourbridge or
brick division in the centre of the part B to guide the draft. Figure 5 shews
a section of the front of the boiler taken across the line Z, Z. Figure 6 is
another section taken across the line O, O, shewing the space opening into the
chimney; and Figure 7 shews a back view of the front part of the boiler.
A, B, C, shew the three parts of which the boiler is to be composed. The part A
consists of a furnace L, the chimney K, the water space J, the steam
chest or space I, the spiral tube H, which opens into the water space at the
lower end, and such is the case with the other two pipes G, G; and it will bo
evident that as these pipes will be full of water when the boiler is at work,
such water will be heated by the heat of the vapours passing up the chimney;
consequently the water will come into the boiler at high temperature. The
upper part of the tube H is connected with the feed head W, the height of
which above the water line of the boiler will depend on the pressure of steam
used as heretofore, and as is well understood. The parts B and C of the
boiler simply consist of water spaces and tubular connections between the
upper and lower water spaces, so as to produce a circulation of the water, and
to offer an extended surface to be heated. The part of the boiler A is in the
Drawing represented to be fixed, whilst the parts B and C have each small
wheels applied thereto, by means of which the parts B and C of the boiler can be
readily separated from each other, and from the part A, by moving the parts
B and C on the rails or guides D, D; by this arrangement it will be evident
that the flues and tubes of the separate parts of the boiler may be readily got
at when they require to be cleansed. But if more convenient, any one of the

page_text: parts A, B, and C, may be fixed, or all may be made moveable. E is the
steam connecting pipe between the upper parts of the boilers A, B, C, and
F is the water communicating pipe, to connect the water spaces of the three
parts A, B, C, of the boiler, as is shewn. M is a left and right hand screw
bolt, the screws of which work in female screws N, N, affixed to the parts A, C,
of the boiler, by means of which the parts of the boiler may be drawn closely
together or separated. I would, however, remark, that other mechanical
means may be resorted to for combining the parts of a boiler constructed
according to my Invention. X, X, X, are man-holes for cleansing out the
water spaces of the parts of the boiler. It will be evident that a boiler might
in like manner be made of more parts than three, and combined together, and
capable of ready separation; and further, a boiler may be made of only two
parts in place of three, having one part or both parts capable of movement and
ready separation from the other. I do not therefore confine myself to the
number of parts shewn in the Drawing. And I would state, that the details of
the construction of each of the parts may be varied without departing from
my Invention, so long as the mode of combining two or more parts be
retained. I have not thought it necessary to shew a safety valve, or steam
pipe, or guage cocks, or man-holes to the steam chest, as a boiler maker
capable of constructing the boiler will, as a matter of course, apply such parts
where most convenient.
Having thus described the nature of my Invention, and the manner in
which the same is to be performed, I would have it understood, that I make
no claim to the separate parts of which the boiler above described is composed.
But what I claim is, the mode of constructing steam boilers for generating
steam of two or more parts, capable of being readily combined, and the parts
readily separated one from the other when required, as above described.
In witness whereof, I, the said John Hall, have hereunto set my hand
and seal, this Seventh day of June, in the year of our Lord One
thousand eight hundred and forty-two.

page_text: DISCLAIMER.
In the Matter of a Patent granted to John Hall, of Breezes Hill,
Ratcliffe Highway, Sugar Refiner, for his Invention of "IMPROVE-
MENTS IN THE CONSTRUCTION OF BOILERS FOR GENERATING STEAM, AND IN
THE APPLICATION OF STEAM TO MECHANICAL POWER," bearing date at
Westminster, the Ninth day of December, One thousand eight
hundred and forty-one, in the fifth year of the reign of Her present
most Excellent Majesty.
DISCLAIMER proposed to be entered by the said John Hall with the
Clerk of the Patents of England, pursuant to an Act passed in the fifth
and sixth year of the reign of His, late Majesty King William the
Fourth, entituled "An Act to. amend the Law touching Letters. Patent
for Inventions."
I, the said John Hall, do declare that since I obtained the said Letters
Patent,. I have discovered that the Invention which was intended to have been
described under that part of the title, which is contained in the following
words," and in the application of steam-to-mechanical power," is not of such
practical utility as would make it desirable to retain it in the said Patent; for
which reason, I am desirous to and do hereby disclaim all that part of the title
which is contained in the following' words," and in the application of steam to
mechanical power."
In witness whereof, I, the said John Hall, have hereunto set my hand
and seal, this Sixth day of June, in the year of our Lord One thousand