IMPROVEMENTS IN THE CONSTRUCTION of the FLUES OF STEAM BOILERS
Year: 1883

page_text: LETTERS PATENT to George Rowland, of Stalybridge in the County of
Chester. for an Invention of IMPROVEMENTS IN THE CONSTRUCTION of the
FLUES OF STEAM BOILERS
"
"
PROVISIONAL SPECIFICATION left by the said George Rowland at the
Office of the Commissioners of Patents on the 28th September 1883.
GEORGE ROWLAND of Stalybridge in the County of Chester
THE CONSTRUCTION OF THE FLUES OF STEAM BOILERS"
"
IMPROVEMENTS IN
The objects of my invention are to give a greater stability and strength to the
said flues, and at the same time to increase the heating surface of the flue and the
displacement of water in the boiler.
I construct the flues of a series of flanged rings or sections rivetted together, but
instead of making them of a cylindrical form as hitherto I make them convex or
arched as regards their longitudinal section.
This convex or arched form will be found to give much greater strength to the
Blues and to give them greater power of resistance against collapsing.
There will also be an increased amount of heating surface owing to the convex
or bulged form of the sections, and consequently there will also be an increased
displacement of water in the boiler.
In some cases I propose to use these convex sectional rings only at the furnace
end of the flues and to have the remaining portion made in the cylindrical form.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said George Rowland in the Patent Office on the 26th March 1884.
GEORGE ROWLAND of Stalybridge in the County of Chester IMPROVEMENTS IN
THE CONSTRUCTION OF THE FLUES OF STEAM BOILERS
The objects of my invention are to give a greater stability and strength to the
said flues, and at the same time to increase the heating surface of the flue and the
displacement of water in the boiler.
Such being the nature and object of my said Invention I will now proceed to
describe in detail the manner in which the same is to be or may be performed or
carried into practical effect, and in order that the same may be clearly understood
I have annexed hereunto a drawing illustrative thereof and have marked the same
with letters of reference corresponding with those in the following explanation
thereof.
The annexed drawing represents in longitudinal section part of a steam boiler
with my improved flues shown as applied thereto, a, a is the shell of the boiler b, b
the fire bars c, c the bridge and d, & the flues.
I construct these flues of a series of flanged rings or sections rivetted together,
but instead of making them of a cylindrical form as hitherto I make them convex
or arched as regards their longitudinal section, as clearly shown in the drawing.
This convex or arched forin will be found to give much greater strength to the
flues and to give them greater power of resistance against collapsing.
There will also be an increased amount of heating surface owing to the convex or
bulged form of the sections and consequently there will also be an increased
displacement of water in the boiler.
In some cases I propose to use these convex sectional rings only at the furnace
end of the flues and to have the remaining portion made in the cylindrical form.
Having now de-cribed the nature and object of my said invention, and the
manner in which the same is to be performel I wish it to be understood that
I claim
The construction of flues for steam boilers of a series of archied or bulged rings or
sections provided with flanges at their ends by means of which they are rivetted
together as herein before described and illustrated by the drawings annexed.
In witness whereof I the George Rowland have hereunto set my hand
and seal this twenty second day of March in the year of our Lord one
thousand eight hundred and eighty four
A6A DOWLAND