IMPROVEMENTS IN THE MANUFACTURE OF WROUGHT-IRON BOILERS FOR BREWING, WASHING, AND OTHER PURPOSES
Year: 1864

page_text: PROVISIONAL SPECIFICATION left by Robert Gardner at the Office of
the Commissioners of Patents, with his Petition, on the 14th November
1864.
I, ROBERT GARDNER, of West Bromwich, in the County of Stafford, Iron
Founder and Boiler Manufacturer, do hereby declare the nature of the said
Invention for "IMPROVEMENTS IN THE MANUFACTURE OF WROUGHT-IRON BOILERS
FOR BREWING, WASHING, AND OTHER PURPOSES," to be as follows.-
My Invention consists in manufacturing the said boilers by making the
sides of one continuous plate of wrought-iron instead of three or four plates
joined or rivetted together as is usual. Or where the boilers are of great depth
and capacity making the sides of two or more continuous plates of wrought-
iron joined one above the other. In making a boiler in which the sides are
composed of one continuous plate of wrought-iron I proceed as follows:-
I take a plate of wrought iron of the required length and breadth, having the
ends inclined to one another at such an angle that when the said ends are
brought together a conical tube open at top and bottom is formed. The side
of the plate between the wider ends is cut of a convex figure, and the side of
the plate between the narrow ends is cut of a concave figure. While flat I
punch the necessary rivet holes in the ends and lower side of the said plate.
I then by means of rolls or otherwise bend the said plate into a conical tube,
the ends of the plate being joined together by a joint of the kind called a jump
joint, that is, with the ends joined face to face instead of overlapping, the jump
joint being completed by rivetting a strip of iron on the outside of the said

page_text: joint. By making the junction of the plates with a jump joint the inside of
the boiler is made smooth. The bottom of the boiler is afterwards joined to
the sides by a jump joint, and the joint completed by rivetting a belt outside
the said joint; or the parts may be joined together by means of a lap joint, in
which case no belt is required. The bottom of the boiler may either be of a
concave or convex figure. A flange may be made from the metal at the top
of the boiler, or a flange of angle-iron may be rivetted thereto, as a bearing
for the boiler on the brick work.
In making a boiler in which the sides are made of more than one contiuuous
plate of wrought-iron continuous plates are taken of the proper size provided
with the necessary rivet holes, and bent into conical tubes, and the said tubes
are rivetted or joined together one above the other to form the sides of the
boiler.
Although I prefer to join the plate or plates forming the sides of the boilers
by jump joints as described yet the said plates may be joined together by lap
joints or by welding. The continuous plates may either be made of equal
thickness throughout, or they may be made bevil or taper in section, the thin
end of the plate being situated at the top of the boiler.
Boilers made according to my Invention may be used without being coated,
or they may be galvanized or enamelled.
Boilers made according to my Invention may be circular, elliptical, square,
or of other figure in cross section.
Boilers made according to my Invention are less costly, more durable, and
take less heat to heat or boil water or other liquid than ordinary boilers.
They are also washed and cleaned with greater ease and in less time, are
less liable to crack or break by heat or cold, and are more readily repaired
than ordinary boilers.