IMPROVEMENTS IN STEAM BOILERS OR STEAM GENERATORS
Year: 1874

page_text: PROVISIONAL SPECIFICATION left by George Herbert Lloyd at the
Office of the Commissioners of Patents, with his Petition,. on the
15th June 1874.
'
I, GEORGE HERBERT LLOYD, of the Firm of Thomas Piggott and..
Company, of Birmingham, in the County of Warwick, Manufacturers,
do hereby declare the nature of the said Invention for "IMPROVEMENTS IN
STEAM BOILERS OR STEAM GENERATORS," to be as follows:-
My Invention consists in constructing and arranging the parts of
steam boilers or steam generators in the manner herein-after described.
In constructing a steam boiler or steam generator according to my
Invention, I employ two or other number of hollow spheres made either
of cast iron, wrought iron, or other metal or alloy, suitable for the manu-
facture of steam boilers. Two circular portions are cut away from cach
hollow sphere, the said cut away portions being at opposite extremes of
the same diameter of the sphere. The said spheres are connected
together at the openings made as, described, the edge of one of the
openings of one sphere being connected to the edge of the opening of the
adjacent sphere by flanges rivetted or otherwise joined together. Or
the spheres may be connected together at their openings by means of

page_text: short tubes of the same diameter as the openings, to which short tubes
the edges of the said openings are connected by rivetting or otherwise.
In this way two or other number of hollow spheres are connected
together so as to communicate with each other by the openings left by
the cut away portions herein-before referred to, or by the connecting
tubes, the said openings or tubes being in a line or symmetrically
arranged about the same axis. In the series of hollow spheres thus
connected together a tubular flue is fixed, the said tubular flue being by
preference slightly conical. One end of the said tubular fluc is rivetted
or otherwise connected, steam and water-tight, with one end of the series
of spheres, and the other end of the said flue is similarly rivetted or
otherwise connected to the other end of the series of spheres. The said
flue is of less diameter than the circular openings or connecting tubes
between the several spheres, and there is consequently free communi-
cation between the interior of the said spheres. The said flue may be
provided with transverse tubes of the kind commonly known as
Galloway tubes, or with other like tubes.
The first and last openings made in the series of spheres are less than
the intermediate ones, being of a size proper to receive and fit the ends
of the tubular flue. A steam pipe on the summit of each sphere com- .
municates with a common steam chest or steam reservoir.
The spheres may be connected at bottom to a water heater or supple- .|
mentary boiler, and may be connected laterally to promote the free
circulation of the water.
Instead of using one tubular flue two tubular flues on the same level a
may be employed; or a series of flues or tubes similar to those used in
a locomotive boiler may be employed.
The steam boiler or steam generator is set in a furnace so arranged
that the fire passing under the series of spheres enters the internal
tubular flue or flues in the spheres, and on emerging from the said flue
or flues divides itself and passes through side flues on either side of the
spheres, and thence to the chimney stack; or the furnace may be
within the tubular flue of the boiler as in the Cornish boiler..