Year: 1895

page_text: I, EDWARD MAKIN Junior, of 40 New Brown Street, Manchester, in the County
of Lancaster, Manufacturer, do hereby declare the nature of this invention to be
as follows:-
My invention relates to improvements in steam boilers and the object of my
improvements is to arrest and absorb a greater portion than usual of the heat
passing through the furnace flue or flues of the boiler and conduct it to the water to
be heated.
In carrying my invention into effect I construct each furnace flue of a number of
flanged tubes preferably of shorter length than now customary and between each
pair of flanges or between as many pairs as may be desired, I rivet a ring or disc of
metal of greater diameter than that of the flanges of the tubes so that when the
rings are riveted into position they project some distance, say three or four inches,
or more or less, into the water space of the boiler: the inner diameter of the rings
is also made smaller than the diameter of the tube so that they project into the
furnace flue; by this means the heat absorbed by the parts of the rings in the flue
The holes in the
is transmitted by the other parts in the water space to the water.
rings may be eccentric in form so that near the bottom of the flue they do not
project into it and therefore allow the lower surface of the flue to be cleaned more
readily.
In place of one or two of the rings or in addition to them I may construct a
bridge beyond the ordinary furnace bridge the additional bridge being arranged to
deflect the gases on to the bottom of the flue and I may also construct a similar
bridge at the rear end of the flue, these extra bridges which may be of firebrick
or metal cause the current of gases to sweep over and keep the bottom of the flue
clean.
DL: 14th dow of Ma 1895
H. B. BARLOW & GILLETT,
Agents for Applicant.
I, EDWARD MAKIN Junior, of 40 New Brown Street, Manchester, in the County
of Lancaster, Manufacturer, 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 invention relates to improvements in steam boilers and the object of my
improvements is to arrest and absorb a greater portion than usual of the heat

page_text: passing through the furnace flue or flues of the boiler and conduct it to the water
to be heated.
In carrying my invention into effect I construct each furnace flue of a number of
flanged tubes preferably of shorter length than now customary and between each
pair of flanges or between as many pairs as may be desired, I rivet a ring or dise
of metal of greater diameter than that of the flanges of the tubes so that when the
rings are riveted into position they project some distance, say three or four inches,
or more or less into the water space of the boiler the inner diameter of the rings is
also made smaller than the diameter of the tube so that they project into the furnace
flue; by this means the heat absorbed by the parts of the rings in the flue is
transmitted by the other parts in the water spice to the water. The holes in the
rings may be eccentric in form so that near the bottom of the flue they do not
project into it and therefore allow the lower surface of the flue to be cleanel more
readily.
In place of one or two of the rings or in addition to them I may construct a
bridge beyond the ordinary furnace bridge the additional bridge being arranged to
deflect the gases on to the bottom of the flue and I may also construct a similar
bridge at the rear end of the flue these extra bridges which may be of firebrick
or metal cause the current of gases to sweep over and keep the bottom of the flue
clean.
And in order that my invention may be fully understood and readily carried into
effect I will describe the accompanying sheet of drawings reference being had to
the figures and letters marked thereon.
Fig. 1 is a longitudinal section of the furnace flue of a steam boiler to which my
improvements are applied, and Figs. 2 and 3 are sectional transverse views
of Fig. 1.
In these views the furnace flue is shown composed of a number of flanged tubes a
between each of which, or between some of them, is riveted a ring or disc of
metal b. In the drawings these rings bare represented with eccentric holes and
with their outer diameter extending beyond the flanges of the tubes and entering
into the water space of the boiler; the inner upper portion of each ring b projects
into the furnace flue while the lower portion is about level with the bottom of the
Alue and therefore allows the lower surface of the flue to be readily cleaned. A fire
brick or metal bridge e is placed a short distance beyond the ordinary bridge cat
the back of the firebars d and the form of the bridge e is shown clearly in Figs. 1
and 3; the latter view showing the bridge supported upon the metallic bricks f
which are formed and arranged as described in the Specification to Letters Patent
numbered 19249 and granted to me on the 13th day of October 1893 and
with which the whole length of the flue or any portion of it may be lined.
I may also construct a similar bridge el near the rear end of the flue as shown and
instead of supporting the bridge (or bridges) on metallic bricks such as fit can be
otherwise supported as for example on angle brackets fixed inside the flue.
Heat from the flame and hot gases passing through the flue is conducted by the
rings into the water space all round the flue whereby the heat from the furnace is
more completely utilized in raising steam. The gases deflected by the bridges e e¹
sweep over and serve to keep the bottom of the flue clean and also to distribute the
heat more equally.
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 :-
1. The combination with the tubes a, of the rings 6 substantially as and for the
purposes herein set forth.
2. The combination with the furnace flue and the ordinary bridge c, of the
.additional bridge or bridges (e¹) substantially as and for the purposes herein set
forth.

page_text: 3. The combination with the tubes a the rings b and the ordinary bridge c, of
the additional bridge or bridges (e e¹) substantially as and for the purposes herein
set forth.
Dated this 14th day of February 1896.
H. B. BARLOW & GILLETT,
17 St. Ann's Square, Manchester, Agents for Applicant.