Improvements in Furnaces or Flue-tubes of High Pressure Boilers.
Year: 1888

page_text: Date of Application, 28th May, 1888
Complete Specification Left, 14th Sept., 1888
Complete Specification Accepted, 19th Oct., 1888
PROVISIONAL SPECIFICATION.
Improvements in Furnaces or Flue-tubes of High Pressure Boilers.
I, ARTHUR JACKSON, of 22 Ward Street, West Hartlepool, in the County of Durham,
Engineer, do hereby declare the nature of this invention to be as follows:-
My Improved Furnaces or Flue-tubes consist of a series of cylindrical rings,
frustums of cones, and annular discs, arranged in the following order :-A short
cylinder of the full diameter of the furnace or flue-tube, a frustum of a cone;
a short cylinder of smaller diameter than the first, and an annular disc. This disc
connects the smaller cylinder to the cylinder next following, which (cylinder) is of the
same diameter as the first, that is, of the full diameter of the furnace or flue tube.
The extremeties of the cylinders, frustums of cones, and annular discs may either be
curved or angular.
The preceding formation is continued until the required length of the furnace or
flue-tube is reached. For moderate lengths each furnace or fluc-tube is made from
one plate.
A modification of the foregoing is when the furnace or flue tube is made up of
sectional rings connected together by riveted circumferential seams; with this
arrangement there are two annular discs between the smaller and larger cylinders.
These sectional rings will either have their longitudinal seams welded or be rolled
seamless.

page_text: I, ARTHUR JACKSON of 22, Ward Street West Hartlepool, in the county of Durham,
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 :-
My improved furnace or Flue-tube consists of a series of cylindrical rings, frusta
of cones and annular discs and in order that my invention may be thoroughly under-
stood I refer to the accompanying drawings.
Fig. I is a sectional view of a single complete furnace or flue-tube made in
accordance with my invention and Fig. II is an enlarged section of a portion
thereof.
In both views similar letters of reference refer to the same parts.
Assuming the fire-door to be in position A in Fig. I the direction of the draught is
as shewn by the arrow . The several parts of which the sectional form of the plate
of the flue-tube consists are arranged as follows
First a short Cylinder C which is of the full diameter of the furnace or flue-tube,
second a frustum of a cone D, third a short Cylinder E, of smaller diameter than C
and fourth an annular disc F. It will be soon that the disc F connects the Cylinder E
with the Cylinder C which is similar to C and is the commencement of another series
of similar sectional forms. The various sections or parts may be united by curves as
shewn in the drawings. The series described are repeated until the desired length of
fluc-tube is obtained.
For moderate lengths each flue-tube is made from one plate. When it is necessary
to join two lengths they can be rivetted with an ordinary lap joint as shewn at
G Fig. I or two of the annular disc portions may be made use of and the joint
rivetted as shown in Fig. III at H.
I do not confine myself to the exact proportions of the several parts to one another
as shewn in the accompanying drawings, and I may while retaining the same sectional
form and described order of the parts, reverse their position relatively to the fire-door
in which case the dotted arrow & would represent the direction of the draught.
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. The special sectional form of furnace or flue-tube consisting of a repetition of a
series of sectional forms, in the order named, sucli forms, being, first a Cylinder,
second a frustam of a cone, third a Cylinder of smaller diameter and fourth an
annular disc substantially as herein before described and illustrated in the accompanying
drawings.
Dated thin 10:1 J