Year: 1886

page_text: I, SAMUEL PEARCE WILDING of the firm of Fell and Wilding, of 1 Queen
Victoria Street, in the City of London, Patent Agents, do hereby declare the nature
of this invention (a communication from abroad by Theodore Lammine, Manu-.
facturing Engineer, of Mülheim on the Rhine) and the manner in which the same
is to be performed to be particularly described and ascertained in and by the
following statement:―
The said invention relates to certain improvements in steam boilers as shown in
the accompanying drawings, in which Fig. 1 is a longitudinal and Fig. 2 a cross
section; like letters referring to like parts in both figures.
.
In a cylindrical boiler A of large diameter and proportionately small length is
inserted a fire box, consisting of a front cylindrical part B of about half the
diameter of the boiler, and a back part C (forming a continuation of B) having the
shape of a chamber, with slightly convex ends, and of side walls, partly cylindrical,
partly flattened. The part B of this fire box is traversed by boiler tubes a, the
back ends of which are inserted in the back wall of the chamber C, their front
ends being inserted in the front wall of the part B, where they join in a compart-
ment B, which is placed on the front like a cover. Above the fire box B the
boiler A is traversed by a considerable number of fire tubes b, which are inserted
in the front wall of the boiler and of that of the chamber C, and are (figure 2)
grouped around the upper part of the fire box B. The flame developed on the bars
placed in the fire box B plays around the boiler tubes a and passes then, after
traversing the chamber C, through the fire tubes b, whence it passes either
through suitable flues in the brickwork of the boiler or through an iron jacket on
the boiler, covered with non-conducting materials. Here it plays around the steam
chest D, to finally escape towards the chimney.
The advantages of the described arrangement are a large heating surface in a
small space, and a larger quantity of water in the free part of the main boiler A.
Further, the whole of the boiler, including the fire flues, is also in a small space,
which makes it specially advantageous for use in ships. A tube c connecting the
space B¹ and the steam chest D allows the steam generated in B¹ to ascend to D. The

page_text: end of the fire box is connected to the end of the boiler by means of two short
tubes E, figure 1, these short tubes serving at the same time for stiffening the end
of the boiler and the end of the fire box. The other end of the boiler is stiffened
by the fire box B and the fire tubes 6 surrounding it in great number. The
stiffening thus affected allows of the usual connections of bolts and strips of iron
being dispensed with. In consequence all parts of the boiler remain easily
accessible for thorough cleaning. It should be also mentioned that the tubes a
and b, can easily be put in and taken out.
Having now fully described and ascertained the nature and objects of the
invention, as communicated to me by my foreign correspondent, I declare that
I claim:-
1st. A steam boiler with inside. furnace in which the fire box, traversed by
boiler tubes a, consists of a cylindrical part B surrounded by fire tubes b, and a
part C, forming a continuation of B, designed for the passage of the fire gases to
the tubes b, the latter part C being in the shape of a chamber formed with convex
ends, and partly cylindrical, partly flattened walls, placed within the water space
of the boiler in such a manner that all the walls are used as a heating surface.
2nd. In a steam boiler as before 'described the application of short tubes E
connecting the end of the chamber C to the neighbouring end of the shell and
serving as man-holes and for stiffening.
FELL & WILDING,
Agents for the Applicant.