CERTAIN IMPROVEMENTS IN STEAM BOILERS OR GENERA- TORS
Year: 1842

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOHN
SQUIRE, of Poughill, in the County of Cornwall, Engineer, send greeting.
WHEREAS Her present most Excellent Majesty Queen Victoria, by Her
Letters Patent under the Great Seal of Great Britain, bearing date at
Westminster, the Twenty-first day of December, in the sixth year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me,
the said John Squire, my exors, admors, and assigns, Her especial licence,
full power, sole privilege and authority, that I, the said John Squire, my
exors, adiñiors, and assigns, and such others as I, the said John Squire, my
exors, adññors, or assigns, should at any time agree with, and no others, from
time to time and at all times thereafter during the term of years therein
expressed, should and lawfully might make, use, exercise, and vend, within
that part of Her said Majesty's United Kingdom of Great Britain and Ireland
called England, Her Dominion of Wales, and the Town of Berwick-upon-
Tweed, my Invention of "CERTAIN IMPROVEMENTS IN STEAM BOILERS OR GENERA-
TORS;" in which said Letters Patent there is contained a proviso that I, the said
John Squire, shall cause a particular description of the nature of my said
Invention, and the manner in which the same is to be performed, under my
hand and seal, 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.

page_text: NOW KNOW YE, that in compliance with the said proviso, I, the said
John Squire, do hereby declare that the nature of my said Invention, and the
manner in which the same is to be performed, are fully set forth and ascer-
tained in and by the following Specification thereof, reference being had to
the Drawings hereunto annexed (that is to say) :-
:-
Figure 1 is a side elevation of a steam boiler embodying my said improve-
ments, with its outer casing removed, in order to show the interior construc-
tion. Figure 2 is a back view, and Figure 3 a front view of the same.
Figure 4 is a plan in the line a, b, of Figures 1 and 2, and Figure 5 a plan
in the line c, d, of Figures 1 and 3. A is the furnace; B', B³, are a series
of double tubes, rising vertically from above the furnace, and constructed and
connected in the manner shewn in the plans Figures 4 and 5, and in the
section and elevation of a single tube given in Figures 6 and 7. The outer
tubes B' are of a cylindrical form, closed at top and bottom, and filled with
water to the height of the general water line w, w; the inner tubes B are
on the contrary open at top and bottom. In order that the flame and heated
vapours from the furnace may ascend freely through them, and to increase
the draught, they are made of a conical form up to nearly the level of the
water line w, w, and then contracted into the narrow cylindrical channel e.
The whole of the spaces between these tubes communicate with one another
by means of the short cross pipes f, f, at top and bottom, which serve also to
bind the tubes together. C, C, are two vertical side chambers, the plates of
which are bound together by stay bolts 3, 3, s, filled with water to the same
height as the tubes B. D, D, D, D, are horizontal water tubes, which
connect the chambers C, C, at the two ends, and also along their bottom
edges, those at the bottom serving at once the purpose of furnace bars and
of steam generators; E, E, are two cylindrical steam receivers connected
by a cross pipe F, into which the steam ascends from the chambers C, C,
and from which it may be conveyed by any of the most approved methods
to the engine cylinders. G, G, is an outside casing of thin sheet iron, by
which the boiler is enclosed, to prevent the escape of heat at the ends where
the tubes D, D, D, D, are exposed, and also to protect the side chambers
and the cylindrical steam receivers from the cooling influence of the atmosphere.
At the top part this casing is pierced with holes to allow the heated vapours
ascending from the furnace through the tubes B' to escape; H, Figures
1 and 2, is a door in the back of the boiler through which the furnace is
supplied with fuel; I is an aperture in the front of the boiler, through which
the exhausted or waste steam is conducted back from the cylinders by means
of pipes into the furnace, and there absorbed. The manner in which the

page_text: connection between the inner and outer tubes B', B³, is formed is as follows:-
The top of the outer tube has a flanged cover, which is driven in_and_rivetted,
and in the centre of this cover there is a screw hole tapped to receive the
top of the inner tube, which, when screwed through, is made tight by a nut
and collar. At the bottom the outer tube is connected with the inner one
by a solid ring, on to which both tubes are rivetted.
And having now described the nature of my said Invention, and the manner
in which the same is to be performed, I declare that though I prefer the
form given to the inner or fire tube B2 in the Drawings hereunto annexed
and before described, I do not limit myself to the use of that particular form,
for the same may be contracted towards the top in various other ways, all
tending more or less to produce the same result, and that neither do I confine
myself to the use of the same number of tubes, or tubes of the same size as
are represented in the said Drawings, since, according to the size of the boiler
and the rapidity with which the steam is required to be generated, the number
and size of the tubes would require to be varied. But that what I claim as
of my Invention is :-
Firstly, the steam boiler before described in the general arrangement and
combination of the parts of which the same consists, and whereby it is dis-
tinguishable from others; and,
Secondly, the employment in tubular boilers of fire and water tubes; the
one within the other, the former being of an area more or less contracted
towards the top, and the latter of the same area throughout.
In witness whereof, I, the said John Squire, have hereunto set my hand
and seal, this Twenty-first day of June, One thousand eight hundred