Improvements in Steam Boilers.
Year: 1888

page_text: Date of Application, 23rd Aug., 1888
Complete Specification Left 23rd May 1889-Accented. 13th July. 1889
PROVISIONAL SPECIFICATION.
Improvements in Steam Boilers.
A communication to me from abroad by FRANÇOIS LE MOAL, of Paris, in tho
Republic of France, Engineer.
I, EDMUND EDWARDS of the firm of Edwards and Co., Patent Agents and
Engineers, 35 Southampton Buildings, Chancery Lane, in the County of Middlesex,
do hereby declare the nature of the said Invention to be as follows:-
This invention relates to boilers used for the generation of steam, and it has for its
object a novel method of construction by which economy of space and of fuel is
effected, with large heating surface, whilst the boiler is simple, strong, and effective.
The improved boiler has an internal fire, and the heating surface consists of
hollow vertical surfaces containing water, and of tubes, the whole being enclosed
in metal plates or sheets and suitable non-conducting material.
The boiler is rectangular in cross section and of suitable length, the fireplace being
at one end and provided with firebars preferably made in two sets with an intermediate
cross bearer, and extending for about half the length of the boiler. The principal
heating surfaces consist of hollow vertical or inclined waterspaces extending from
end to end of the boiler, a sufficient number of these waterspaces being arranged
parallel to each other and being preferably of less depth at the front end above the
fire, their lower edges inclining downward toward the other end of the boiler.
Each water space consists of two plates, rivetted together at their upper and lower
edges with the intervention of bars representing the internal width of the water-
space, the plates being strongly stayed together by a sufficient number of tubular
stays.
The number, length, and height of these waterspaces may be varied according to
the purpose for which the boiler is required, and by their use the water is divided
into a corresponding number of thin sheets exposing a large surface to the heat of
the fire. The two outer waterspaces are of greater depth and form the sides of the
boiler.
A firebridge of the usual kind is provided at the inner end of the firegrate,
extending across the inside of the boiler and rising to a sufficient height between
the parallel waterspaces described. The flame passes over this bridge and between
the parallel heating surfaces and finally passes to the chimney through one or more
openings at the lower part of the back end of the boiler.
The ends of the several hollow waterspaces described are connected together by
sufficiently strong hollow chambers, so that circulation of the water and separation of
the steam can take place freely, the movement of the water preventing incrustation or
the collection of sediment.
A transverse row of longitudinal tubes is arranged above the upper edge of the
waterspaces, the ends of the tubes being fixed in the connecting chambers described,
and a similar row of tubes preferably of larger diameter is similarly arranged above
those just described and serve as a steam space.
In the improved boiler described a very large and effective heating surface is
exposed to the action of the flame between the hollow heating surfaces and through
the tubular stays in the latter, and the volume of water in the boiler being
comparatively small and in thin sheets steain can be raised to a high pressure very
quickly and without danger.
The details of construction and arrangement may be varied more or less as may be
found convenient.
EDWARDS & Co.,
Agents for the Applicant.

page_text: COMPLETE SPECIFICATION.
Improvements in Steam Boilers.
A communication to me from abroad by FRANÇOIS LE MOAL, of Paris, in the
Republic of France.
I, EDMUND EDWARDS, of the firm of Edwards and Co., Patent Agents and
Engineers, of 35, Southampton Buildings, Chancery Lane, in the County of Middlesex,
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 and accompanying drawings, that is to say :-
This invention relates to boilers used for the generation of steam, and it has for its
object a novel method of construction by which economy of space and of fuel is
effected, with large heating surface, whilst the boiler is simple, strong, and effective.
The improved boiler has an internal fire, and the heating surface consists of hollow
vertical surfaces containing water and of tubes, the whole being enclosed in metal
plates or sheets and suitable non-conducting material.
In the accompanying drawings which are in illustration of the invention, figure 1 is
a section on the line C, D, (figure 2), shewing the longitudinal arrangement of the
vertical heating surfaces and tubular stays, and the manner of their connection at the
ends of the boiler.
The boiler is rectangular in cross section and of suitable length, the fireplace a of
large area being at one end and provided with firebars bb preferably made in two
sets so that they are short and light and can be easily taken out, with an intermediato
cross bearer and extending for about half the length of the boiler. The principal
heating surfaces consist of hollow vertical or inclined water spaces c extending from
end to end of the boiler, a sufficient number of these water spaces being arranged
parallel to each other and being preferably of less depth at the front end above the
fire their lower edges inclining downward toward the other end of the boiler.
Each water space consists of two plates, rivetted together at their upper and lower
edges with the intervention of bars representing the internal width of the water space,
the plates being strongly stayed together by a sufficient number of tubular stays i
and 7.
The number, length, and height of these waterspaces may be varied according to
the purpose for which the boiler is required, and by their use the water is divided into
a corresponding number of thin sheets exposing a large surface to the heat of the
fire. The two outer waterspaces are of greater depth and form the sides of the
boiler.
A firebridge d of the usual kind is provided at the inner end of the firegrate,
extending across the inside of the boiler and rising to a sufficient height between the
parallel waterspaces described. The flame passes over this bridge and between the
parallel heating surfaces and finally passes to the chimney through one or more
openings j,j, at the lower part of the back end of the boiler.
The firedoor e is placed at the level of the grate, to facilitate the stirring and
feeding of the fire.
The ends of the several hollow waterspaces described are connected together by
sufficiently strong hollow chambers f, so that circulation of the water and separation
of the steam can take place freely, the movement of the water preventing
incrustation or the collection of sediment.
Figure 2 is a transverse section on the line A, B, (figure 1), shewing the arrange-
ment of the vertical surfaces or water spaces c, so that they are subjected to the most
intense heat of the fire.
A transverse row of longitudinal tubes n is arranged above the upper edges of the
water spaces, the ends of the tubes being fixed in the connecting chambers described,
and a similar row of tubes m preferably of larger diameter is similarly arranged above
those just described and serve as a steam space.
The outer casing of the boiler is shown at o. v.

page_text: In the improved boiler described a very large and effective heating surface is
exposed to the action of the flame between the hollow heating surfaces and through
the tubular stays in the latter, and the volume of water in the boiler being com-
paratively small and in thin sheets, steam can be raised to a high pressure very
quickly and without danger.
The details of construction and arrangement may be varied more or less as may be
found convenient.
Having now particularly described and ascertained the nature of the said Inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. The boiler consisting of the firegrate b, vertical or inclined waterspaces c,
tubular stays i and connecting chambers f, arranged and operating substantially as
described and shewn in the drawings.
2. In combination with the waterspaces c, and connecting chambers f, f, the
firebridge d, and opening to the chimney, arranged substantially as described and
shown.
3. In combination with the waterspaces c and connecting chambers f, f, the
external metal case o, p, and non-conducting material, substantially as described.
Dated this 23rd day of May 1889.
EDWARDS & Co.,
35, Southampton Buildings, London, Agents for the Patentee