Year: 1887

page_text: Date of Application, 18th Nov., 1887
Complete Left, 20th Feb., 1888
Complete Accepted, 23rd Mar., 1888
declare the nature of this invention to be as follows:-
This Invention which relates to boiler furnaces and is particularly applicable to
Egg-Ended or Cornish boilers has for its object to effect more complete combustion
of the fuel burned therein and to prevent in greater measure the emission of smoke
therefrom.
In carrying out the invention an air duct or channel is formed on each side of the
furnace or combustion chamber extending from the front of the boiler to the rear end
of the fire grate where the air supply for the proper combustion of the fuel is discharged
after having been heated in passing through the ducts or channels; and just beyond.
the fire grate where in ordinary furnaces a flame bridge is formed, a wall of fire
brick, or similar refractory material is built up to the bottom of the boiler to prevent
the direct out-flow of the fire gases whilst a longitudinal flue space is formed on each
side of said wall and extends towards the rear terminating in general at about the
mid length of the boiler. Thence the flues return towards the flame wall, there meet
in a central flue space which extends rearwards towards the end of the boiler. From
the rear end of the boiler the flue is carried back in a line parallel to the first men-
tioned flues but at a higher plane and farther from the central flue in order that the
hot products of combustion flowing therethrough may be brought into contact with
the sides of the boiler, and at the front the side flue is carried across the upper front
part of the furnace to the opposite side of the boiler along which it is carried to an
outlet at the rear leading to the chimney: The several channels composing this sinuous
flue are formed by walls of brickwork carried up to the bottom of the boiler and
serving in part to support the boiler, and as the channels are only separated from each
other by the walls the heat of the fire gases which are deflected by the flame wall to
the channels on each side and are thence carried through the sinuous flue to the
chimney is almost entirely utilized in heating the boiler.
Dated this Seventeenth day of November 1887.
CRUIKSHANK & FAIRWEATHER,
62, Saint Vincent Street, Glasgow,
Agents.

page_text: I, DAVID MCQUEEN, Factor Wishaw Estate Office, Wishaw, Lanarkshire, 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:
This Invention which relates to boiler furnaces and is particularly applicable to
Egg-Ended and Cornish boilers has for its object to afford more complete combustion
of the fuel burned therein and to prevent in greater measure the emission of smoke
therefrom.
In carrying out the invention as applied to an Egg-Ended boiler and as represented
in sheet 1 of the accompanying drawings in horizontal section at figure 1 in sectional
elevation at figure 2 and in cross sections at figures 3, 4, and 5, an air duct or
channel a is formed on each side of the furnace or combustion chamber b extending
from the front of the boiler c to the rear end of the fire-grate d where the air supply
for the proper combustion of the fuel is discharged through lateral openings e after
having been heated in passing through the ducts or channels; and just beyond the
fire grate where in ordinary furnaces a flame bridge is formed, a wall f of fire brick
or similar refractory material is built up to the bottom of the boiler to prevent the
direct outflow of the fire gases whilst a longitudinal flue space g is formed on each
side of said wall and extends towards the rear terminating in general at about the
mid length of the boiler. Thence the flues return at h towards the flame wall, and
there meet in a central flue space which extends rearwards toward the end of the
boiler and communicates with the chimney. The several channels g, h, i composing
this sinuous flue are formed by walls of brickwork carried up to the bottom of the
boiler and serving in part to support the boiler, and as the channels are only separated
from each other by the walls the heat of the fire gases, which are deflected by the
flame wall to the channels g on each side and are thence carried through the sinuous
flue to the chimney, is almost entirely utilized in heating the boiler.
In cases in which sufficient draught can be maintained as for example when a tall
chimney is provided the flue i may be carried forward from the rear end of the boiler
in a line parallel to the first mentioned flues g but at a higher plane and farther from
the central flue i in order that the hot products of combustion flowing therethrough
may be brought into contact with the sides of the boiler and at the front the side flue
is carried across the upper front part of the furnace to the opposite side of the boiler
along which it is carried to an outlet at the rear leading to the chimney. In sheet 2
of the drawings my invention is shown as applied to a Cornish boiler figure 1 being a
horizontal section of the boiler flue c¹ figures 2 and 3 longitudinal vertical sections
and figures 4 and 5 cross sections, the boiler shell c being represented in dotted lines:
The arrangement of the air ducts a deflecting wall and sinuous flue g, h, i is similar
to that described with reference to the illustrations on sheet 1, excepting that the

page_text: several walls are placed within the boiler flue instead of under the boiler, and that
they are carried on a floor J formed in the flue. The flue i in this case instead of termin-
ating in the chimney opening is connected to a flue space j under the floor J wherein
the products of combustion are carried forward to the rear end of the fire grate and
there return through a flue k on the opposite side of a supporting wall K to the
chimney outlet. The walls are by preference composed of fire clay slabs made to fit
in place without building.
In each case the admission of air by the ducts or channels may be regulated by the
use of sliding doors or like means.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is
In a boiler furnace the arrangement of the deflecting wall and sinuous flue in con-
junction with air ducts or channels admitting heated air at the rear of the fire grate
substantially as described with reference to the annexed drawings.
Dated this Eighteenth day of February 1888.
CRUIKSHANK & FAIRWEATHER,
62, Saint Vincent Street, Glasgow,
Agents.
CRUIKSHANK & FAIRWEATHER,
62, Saint Vincent Street, Glasgow,
Agents.