CERTAIN IMPROVEMENTS IN THE CONSTRUCTION of SAE ROLLERS STEAM BOILERS
Year: 1853

page_text: LETTERS PATENT to Thomas Evans the younger, of 18, Tooley
Street, Southwark, in the County of Surrey, Corn Factor, for the
Invention of "CERTAIN IMPROVEMENTS IN THE CONSTRUCTION of
SAE ROLLERS"
Scaled the 8th September 1853, and dated the 12th March 1853.
PROVISIONAL SPECIFICATION left by the said Thomas Evans at
the Office of the Commissioners of Patents, with his Petition, on
the 12th March 1853.
I, THOMAS EVANS the younger, of 18, Tooley Street, Southwark, in
the County of Surrey, Corn Factor, do hereby declare the nature of
the said Invention for "CERTAIN IMPROVEMENTS IN THE CONSTRUCTION
OF STEAM BOILERS" to be as follows:-
In the place, as heretofore, of making the bottoms or heating surfaces
of steam boilers of a flat, circular, or other configuration, I make
them with one or more chambers or reservoirs, running longitudinally,
transversely, or in any way best suited for the purpose of increasing the

page_text: area of the heating surface, and which said chambers or reservoirs may
be formed of a conical, curvilineal, angular, square, or of any other
figure best adapted for the purpose, and by which means an advantage
may be gained in generating steam.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Thomas Evans, in the Great Seal Patent Office,
on the 12th September 1853.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I,
THOMAS EVANS the younger, of 18, Tooley Street, Southwark, in the
County of Surrey, Corn Factor, send greeting.
WHEREAS IIer most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twelfth day of March, in the year of
our Lord One thousand eight hundred and fifty-three, in the sixteenth
year of Her reign, did, for Herself, Ifer heirs and successors, give and
grant unto me, the said Thomas Evans the young Her special
licence that I, the said Thomas Evans, my executors, administrators,
and assigns, or such others as I, the said Thomas Evans, my execu-
tors, 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 "CERTAIN IM-
PROVEMENTS IN THE CONSTRUCTION OF STEAM BOILERS," upon condition
(amongst others) that I, the said Thomas Evans, by an instrument in
writing under my hand and seal, 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 Oflice within six calendar months next and immediately
after the date of the said Letters Patent.

page_text: NOW KNOW YE, that I, the said Thomas Evans, 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 (that is to say):
My Invention as improvements consists in the peculiar construction
and formation of such part or parts of boilers and other vessels to which
heat is or may be applied for the purpose of generating steam, or boiling
or heating liquids, or melting fatty, glutinous, or resinous substances;
and which improvements are not only applicable to boilers of locomotive,
marine, and stationary engines, coppers, cauldrons, vats, and other
vessels used for the purposes above named, but also to articles of
domestic use, wherein water or other fluid is required to be heated or
substance to be melted; and which improvements will more fully
appear upon reference being had to the accompanying drawings, which
I will now proceed to describe, as follows (the same letters of reference
denoting similar corresponding parts).-Figure 1, is a sectional elevation
of a boiler, having my improvements attached thereto. A, A, A, surface
plates, forming the boiler; B, B, B, the bottom of boiler, constructed of
a curvilineal form, or of a series of chambers running longitudinally
the whole length of the boiler; C, C, the fire box, representing the
heat or flame ascending to the heating surface or chambers B, B, B, of
the boiler; D, D, D, braces or supports, screwed, nutted, or otherwise
affixed, either horizontally, vertically, or obliquely, within the boiler, for
the purpose of strengthening it. Figure 2, a transverse section, shewing
the braces or supports. Figure 3, an enlarged view of the bottom of the
boiler, delineated for the purpose of more distinctly shewing the object
of my improvements. Figure 4, another lineal section of the bottom of
the boiler, shewing a different form of the chambers described under
Figure 1; and Figure 5, a sectional elevation of a Cornish boiler, with
my improvements thereto added. By the application to a boiler
or other vessel used for heating or melting fluids and substances of my
improved heating surface, water or other fluid contained in such boiler
or vessel becomes heated, and fatty, glutinous, or resinous matter be-
comes liquified or melted, in a much less time than by the ordinary and

page_text: known methods at present in use, by reason of a greater surface of
heat playing and having power over the same quantity of water, or other
liquid, fatty, glutinous, or resinous matter, as is usually contained in
boilers or other vessels of the same dimensions; and also, by the peculiar
form of the chambers, exposing small bodies of water or other fluid,
fatty, glutinous, or resinous matter, to the direct action of the fire. In
the construction and formation of bottoms of boilers and other vessels
for containing water or other fluids, fatty, glutinous, or resinous matter,
I may in some cases find it desirable to construct such bottoms of a
series of angularly shaped chambers, as shewn in Figure 4, on the said
plan, running either longitudinally, transversely, circularly, curvilineally,
or obliquely, in place of the curvilineal chambers already described; or
I may find it desirable to combine the two; and I do not therefore con-
fine myself to the precise form as shewn in the accompanying drawings,
nor do I confine myself to the precise dimensions of such chambers,
as much must necessarily depend upon the size of the boiler or vessel
to which such said improvements are or may be applied. and also
whether a larger or smaller heating surface be required. Likewise, with
reference to Cornish or circular boilers, or other vessels of a like con-
struction, I do not confine myself to the precise number of chambers,
or the precise area of the heating surface required therein, or to the
precise part or parts to which such chambers shall or may be formed.
Ilaving thus described the nature of my said Invention, and the manner
in which the same is to be performed, I would remark that I am aware
of cones, or conical shaped vessels, having been applied to the bottoms
of boilers for the purposes above described, but which cones or conical
shaped vessels materially differ from my method, both in position and
effect; and what I claim as my improvements in the construction of
steam boilers is the quicker generation of steam, and boiling of water
or other liquid, or inclting or heating fatty, glutinous, or resinous
matter, by means (as herein-before described) of presenting an increased
heating surface to no larger body of water, or other fluid or matter,
than is usually contained in boilers or vessels of the same dimensions,
and also by the peculiar form of the chambers exposing small bodies of

page_text: water or other fluid, fatty, glutinous, or resinous matter, to the direct
action of the fire.
In witness whereof, I have hereunto set my hand and seal, the
Ninth day of September, in the year of our Lord One thousand
eight hundred and fifty-three.
THOMAS EVANS jun. (L.S.)