IMPROVEMENTS IN BOILERS
Year: 1884

page_text: We, JAMES JOHN MILLER and GERALD JOHN TUPP, both of Hammersmith in the
County of Middlesex, Engineers and Boat Builders, do hereby declare the nature
of our invention for "IMPROVEMENTS IN BOILERS " to be as follows:-
Our invention relates to boilers ordinarily used for the purpose of generating
steam and especially to the kind known as vertical boilers, and it has for its object
novel methods of constructing and arranging the parts of such boilers so that
they are very strong, cheap, and effective, and readily accessible for repair when
roquired.
Supposing our invention to be applied to a cylindrical vertical boiler, having a
horizontal firegrate in its lower part, we make the inner firebox in the usual way
of an inner cylinder, preferably tapering to a less diameter at its upper end, fitting
inside the outer shell with a suitable water space between them, the lower edges of
the two being rivetted together so as to make a tight joint, and an opening for a
firedoor being made through them in the usual way.
We make the upper part of the inner firebox flat upon two of its opposite sides,
the flat parts being parallel, and into these flat parts we insert a sufficient number
of tubes, horizontal or somewhat inclined. These tubes are preferably fixed by
screwing their ends into the two parallel sides of the firebox which form tube
plates, the tubes being expanded at one end so that the remainder of their length
can pass through the holes in the corresponding plate, but the pitch of the screw
threads being the same at both ends.
The upper part of the inner firebox is closed by a flat or convex plato having a
central opening which is connected to a corresponding central opening in the top
of the boiler by a strong vertical tube or flue above the upper open end of which
is arranged a chimney of any convenient shape and size. The vertical flue is
preferably larger at its upper end, the hole in the top of the boiler being made of a
corresponding size,
We arrange the horizontal tubes described, which pass across the firebox, in
groups or in such manner that the ends of one part of their number are opposite to
a manhole upon one side of the boiler, whilst the other ends of the other part of
their number are opposite to a similar manhole upon the opposite side of the boiler,
the two manholes being provided with sufficiently strong covers or doors and
D....dll

page_text: fastenings of the usual kind by which they can be closed steamtight, and we
arrange the two manholes and the corresponding direction of the cross tubes, in
the most convenient position, in plan, to give ready access to them.
It will be seen that by the method of construction and arrangement described
the tubes through which water is always circulating, pass through the fire in the
upper part of the firebox, whilst when necessary some of the tubes can be cleaned,
repaired, or replaced, through one of the manholes, whilst the remainder can be
cleaned, repaired, or replaced through the other opposite manhole.
We prefer to arrange round the ends of the tubes opposite each manhole a
deflecting plate closed below and at the sides but open above, so that circulation
of water through the tubes is facilitated; and such deflecting plates can be adjusted,
fixed, and removed when required for cleaning the tubes, by means of the manhole
opposite to it.
A horizontal baffle plate may be suspended in the firebox a short distance below
the top of the latter, above the tubes, in order to prevent the flame and products
of combustion from passing too directly to the chimney.
Boilers constructed according to our invention are cheap, simple, and strong, not
liable to prime, and readily cleaned when required.

page_text: We, JAMES JOHN MILLER and GERALD JOHN TUPP, both of Hammersmith, in
the County of Middlesex, Engineers and Boat Builders do hereby declare the nature
of our invention for IMPROVEMENTS IN BOILERS" and in what manner the same is
to be performed, to be particularly described and ascertained in and by tho
following statement:—
Our invention relates to boilers ordinarily used for the purpose of generating
steam and especially to the kind known as vertical boilers; and it has for its object
novel methods of constructing and arranging the parts of such boiler so that they
are very strong, cheap, and effective, and readily accessible for repair when
required.
The accompanying drawing is in illustration of our invention, which is shewn
applied to a cylindrical vertical boiler, having a horizontal firegrate in its lower
part.
Figures 1 and 2 are vertical sections, and figure 3 a horizontal section.
We make the inner firebox in the usual way of an inner cylinder a preferably
tapering to a less diameter at its upper end, fitting inside the outer shell 6 with a
suitable water space c between them, the lower edges of the two being rivetted
together at d so as to make a tight joint, and an opening for a firedoor being made
through them in the usual way at e.
We make the upper part of the inner firebox a flat upon two of its opposito
sides the flat parts being parallel, as shown in figures 2 and 3, and into these flat
parts wo insert a sufficient number of transverse tubes f,f,f, and g, g, g, horizontal
or somewhat inclined. These tubes are fixed in the ordinary way by expanding
and rivetting, or preferably by screwing their ends into the two parallel sides of the
firebox a, which form tube plates, the tubes being either fixed in the usual way as
shewn, or enlarged at one end so that the remainder of their length can pass
through the holes in the corresponding plate, but the pitch of the screw threads
being the same at both ends.
The upper part or top of the inner firebox is formed of a flat or convex plate h
having a central opening which is connected to a corresponding central opening
in the top of the outer shell of the boiler b by a strong vertical tube or flue k above
the upper open end of which is arranged a chimney of any convenient shape and
size. The vertical flue is preferably larger at its upper end, the hole in the top
of the boiler being made of a corresponding size.
Or, sometimes, instead of a single central tube or flue, we use two or more such
tubes or flues,
We arrange the horizontal tubes described, which pass across the firebox, in
groups or in such manner that the ends of one part of their number, for instance
those shewn at f, f. f. f, f, are opposite to a manhole m upon one side of the
boiler, whilst the other ends of the other part of their number g, g, J. J. J, are
opposite to a similar manholen upon the opposite side of the boiler, the two
manholes being provided with sufficiently strong covers or doors and fastenings of
tho usual kind by which they can be closed steamtight, and we arrange the two
manholes m, n, and the corresponding direction of the cross tubes, in the most
convenient position, in plan, to give ready access to them.
It will be seen that by the method of construction and arrangement described
the tubes through which water is always circulating, pass transversely through the
fire in the upper part of the firebox, whilst when necessary some of the tubes can

page_text: be cleansed, repaired, or replaced, through one of the manholes, whilst the
remainder can be cleaned, repaired, or replaced through the other opposite manhole.
We prefer to arrange round the ends of the tubes opposite each manhole m and n
a deflecting plate o closed below and at the sides but open above, so that circulation
of water through the tubes is facilitated; and such a deflecting plate can be
adjusted, fixed, and removed when required for cleaning the tubes by means of
the manhole m or n opposite to it.
A similar deflecting plate, but closed above and open below may also be fitted
opposite the other ends of each set of tubes.
A horizontal baffle plate may be suspended in the firebox a short distance below
the top of the latter above the tubes, in order to prevent the flame and products of
combustion from passing too directly to the chimney.
Boilers constructed according to our invention are cheap, simple, and strong, not
liable to prime, and readily cleaned when required.
Our invention may be applied to boilers of other shapes as well as to vertical
ones.
Having now particularly described and ascertained the nature of our said
Invention and in what manner the same is to be performed, we declare that what
we claim is:—
1. The combination of the firebox a, the sets of tubes f, f. f, and g, g, g, and the
manholes m, and n, substantially as described and shewn.
2. The deflecting plates o, opposite the ends of the tubes f, f, f, and g, 9, 9,
substantially as and for the purpose described and shewn.
-Dated this 3rd day of January 1885.