IMPROVEMENTS IN THE MODE OF PREVENTING INCRUSTATION IN BOILERS
Year: 1857

page_text: LETTERS PATENT to James Hall, of Lancaster, in the County of Lan-
caster, Engineer, for the Invention of "IMPROVEMENTS IN THE MODE OF
PREVENTING INCRUSTATION IN BOILERS."
Sealed the 6th October 1857, and dated the 22nd July 1857.
PROVISIONAL SPECIFICATION left by the said James Hall at the
Office of the Commissioners of Patents, with his Petition, on the 22nd
July 1857.
I, JAMES HALL, of Lancaster, in the County of Lancaster, Engineer, do
hereby declare the nature of the said Invention for "IMPROVEMENTS IN THE
MODE OF PREVENTING INCRUSTATION IN BOILERS," to be as follows:-
My Invention consists in the adaptation and application to steam boilers of
a vessel or receptacle of the form and construction herein-after described, for
collecting the sediment contained in the water.
The vessel or receptacle is composed of a series of metal plates, one within
the other, in which are formed apertures or spaces for the passage of water
and sediment into the interior of the vessel or receptacle; such apertures or
spaces being arranged so that the aperture or space in the one plate may
alternate with the obstructing piece of metal in the next plate, and thus over-.
come the agitation of the water passing from the boiler before it reaches tho
interior of the vessel or receptacle.

page_text: The plates are united at intervals by means of metal stays, but the mode of
uniting them may be varied. There is a pipe leading from the interior of
the vessel or receptacle from which the sediment may be drawn as required-by
means of a cock conveniently fixed outside the boiler. The shape of the
vessel or receptacle may be varied, but I prefer that it should be funnel-shaped.
Also it may be desirable in some cases to employ more than one vessel or
receptacle of the above-named construction either separately or combined.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said James Hall in the Great Seal Patent Office on the 18th
January 1858.
i
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JAMES
HALL, of Lancaster, in the County of Lancaster, Engineer, sond greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twenty-second day of July, in the year of our
Lord One thousand eight hundred and fifty-seven, in the twenty-first year
of Her reign, did, for Herself, Her heirs and successors, give and grant unto
me, the said James Hall, Her special license that I, the said James Hall,
my executors, administrators, and assigns, or such others as I, the said
James Hall, 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 THE
MODE OF PREVENTING INCRUSTATION IN BOILERS," upon the condition (amongst
others) that I, the said James Hall, by an instrument in writing under my
hand and seal, should particularly describe and ascertain the nature of the said
İnvention, 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 James Hall, 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 Drawing hereunto annexed, and to the letters
and figures marked thereon (that is to say) :-
My Invention of "Improvements in the Mode of Preventing Incrustation
in Boilers" consists in the adaptation and application to steam boilers of a

page_text: vessel or receptacle of the form and construction herein-after described, for
collecting the sediment contained in the water.
The vessel or receptacle is composed of a series of metal plates one within
the other, in which are formed apertures or spaces for the passage of water
and sediment into the interior of the vessel or receptacle, such apertures or
spaces being arranged so that the aperture or space in the one plate may
alternate with the obstructing piece of metal in the next plate, and thus over-
come the agitation of the water passing from the boiler before it reaches the
interior of the vessel or receptacle.
The plates are united at intervals by means of metal stays, but the mode of
uniting them may be varied. There is a pipe leading from the interior of the
vessel or receptacle from which the sediment may be discharged as required by
means of a cock conveniently fixed outside the boiler. The shape of the vessel
or receptacle may be varied, but I prefer that it should be funnel-shaped. Also
it may be desirable in some cases to employ more than one vessel or receptacle
of the above-named construction either separately or combined.
. In order, however, that my Invention may be fully understood, I will prcc:ed
to describe it more particularly by the aid of the accompanying Drawing, in.
which Fig. 1 is an elevation, and Fig. 2 a horizontal section of one form of the
vessel or receptacle; Fig. 3 is an elevation, and Fig. 4 a horizontal section of
two vessels or receptacles combined; Fig. 5 represents a vessel or receptacle
similar to that shewn at Figures 1 and 2 applied to a boiler. In all these
Figures the same letters of reference indicate corresponding parts. a, a, arẹ
the series of metal plates of which the vessel or receptacle is composed; these
plates are respectively formed so as to converge to a central aperture at the
bottom of each plate leading to a discharge pipe. b, b, are apertures or spaces
formed in the plates a, a, so that an aperture in one plate may be opposite to
the metal of the next plate; c, c, are metal stays, by means of which the plates
are kept apart, and are united to form the vessel or receptacle; d is the dis-
charge pipe at the bottom of the outer plate a, communicating with the
apertures at the bottom of the inner plates a, a, respectively; e is the discharge
cock, by opening which the sediment may be blown in a partially liquid state
through the pipe d by the pressure of the steam in the boiler. In Figures 3
and 4, ff, are nuts and bolts by which the flanges of the two vessels or
receptacles, or two portions of the vessel or receptacle, are united together.
g. 9, are the supports by which the vessel or receptacle is suspended within
the boiler so as to be immersed in the water to about the depth shewn in the
Figure.
It will be seen that the water in a state of ebullition in the boiler as it

page_text: enters the vessel or receptacle through the apertures or spaces in the outer
plate will come in contact with the metal surface of the next plate, which will
tend in some degree to destroy the agitation of the fluid, and this effect will be
repeated on its passing through the next aperture or space into the next cell
of the vessel until it arrives at the interior thereof, by which time the agitation
of the fluid will be so far diminished as to admit of its precipitating the
matters held in solution, and forming a sediment capable of being discharged
through the piped and cock e when required.
Having thus described the nature of my Invention, and in what manner the
same is to be performed, I would have it understood that I do not claim as of
my Invention any particular form or construction of the vessel or receptacle
otherwise than as composed of a series of metal plates as described, nor any
particular mode of applying the same to boilers; but what I do claim as of
my Invention is the adaptation and application to boilers of a vessel or vessels
composed of a series of plates one within the other with apertures or spaces,
arranged as described, for the purpose of diminishing the agitation of the
water and collecting the sediment contained therein, in order that it may be
afterwards discharged as required.
In witness whereof, I, the said James Hall, have hereunto set my hand
and seal, the Twenty-second day of September, in the year of our Lord
One thousand eight hundred and fifty-seven.
Witness,
WILLIAM SPENCE,
50, Chancery Lane,
Patent Agent.
JAMES HALL. (L.S.)