Year: 1886

page_text: I, WILLIAM ROBERT DENNIS of 93 Copenhagen Road New Brompton, Chatham, in
the County of Kent, Engineer do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and ascertained
in and by the following statement:—
The object of this my invention is to provide greater heating surface combined with
compactness and economy and furthermore to entirely dispense with the combination
of brickwork commonly used in that class of boilers known as heating apparatus.
My invention consists of a horse shoe bent flue entirely surrounded by water space
which I now proceed to describe and illustrate in the drawings annexed, reference
being had to the letters and numbers marked thereon. Fig. 1 is a sectional side
elevation of my improved boiler taken on line of Fig. 2.
Figs. 2 and 3 are respectively front and side elevation of same.
Fig. 4 is a sectional elevation on line
yy of Fig. 1.
In this my invention I provide a casing. A formed of one or more pieces of sheet
metal and having at its periphery or outer edges, flanges a by means of which the
casing A is securely bolted, rivetted or otherwise attached to the covers or side
pieces B which are also made of one or more pieces of sheet metal, hollow in shape
and having their edges formed into flanges bb corresponding to those marked a a on
the casing A. In the front of the casing A, and at suitable positions are the doors,
respectively-soot door C, furnace feed door c, furnace clearing door c¹, ash door and
draught regulator &³, said doors being attached to the sides of the casing and flue
either by angle irons and bolts as shewn or in any suitable manner. I arrange the
interior for flue and water space as follows:-Several sheets of metal d are curved in
such a manner that the surfaces form a flue, having three or more distinct top heating
surfaces (according to size of boiler) by means of which arrangement the unconsumed
smoke is first held over the fire then passed through the flames at the curve and carried
upwards by the draught to the chimney E.
The sheets of metal d are cast or wrought, and secured by bolts or rivets, which
pass through holes in the flanges d¹ suitably formed at their outer edges to two sides
or end plates F, which form the sides of the furnace and flue D. It will be observed
that the covers B when secured to the casing A, form by means of the cavity or

page_text: hollow in their shape, a water space between their outer sides and the side-plate F of
the furnace and flue D,-the whole of the fire space with the exception of the front
being by this means surrounded by water, thus obviating any danger of fire to sur-
rounding objects and obviating the necessity of using brickwork, fireclay or other
covering materials. At the rear and lower part of the boiler is attached in any suitable
way the pipe or inlet G through which the cold water enters, and as the water becomes
heated it rises to the surface and passes through the outlet H, and by the action of
cold water taking its place, a perfectly uniform and complete circulation is secured in
the direction indicated by arrow heads. The fire bars jare supported either on angle
irons e securely fixed to the sides of the furnace and flue as shown, or in any other
suitable way.
Having now particularly described and ascertained the nature of my said invention,
and in what manner the same is to be performed I declare that what I claim is :—
1. In a heating apparatus the construction of curved flue entirely surrounded by
water space, substantially as described, set forth and illustrated in the drawings
annexed.
2. In a heating apparatus the construction of top heating surfaces substantially as
and for the purposes herein before described set forth and illustrated in the drawings
annexed.
3. In a heating apparatus the compact arrangement of water space by which a large
quantity of water is quickly heated at a small cost of fuel, substantially as described,
set forth and illustrated in the drawings annexed.