Year: 1886

page_text: Date of Application, 3rd Aug., 1886.
Complete Left, 3rd May, 1887.
Complete Accepted, 3rd June, 1887.
I, JOHN RICHARDSON, of the firm of Robey & Co., Lincoln, Engineers, do hereby
declare the nature of this invention to be as follows:-
The object of this invention, is to dispense with internal stays, or tie-bars without
interfering with the efficiency of the boiler.
For the purpose of my invention, I make the internal shell, or fire box of cylindrical,
or circular shape vertically, with contracted portions for forming a water chamber
between it and the outer shell also cylindrical, or circular, and with bulged out, or
enlarged portions for connection to the outer shell such as at the base and at the
fire door. The dome is circular, or capped with overlapping edges to fit on the
belly plates.
The back plate of the fire box merges from a round to a flat by a curve, for the
reception of tubes, whose opposite ends are in a flat plate in a cylindrical horizontal
barrel and terminates in the smoke box. The upper part of the back plate by its
formation somewhat contracts the fire box but forms a kind of natural water bridge.
Dated this 3rd day of August 1886.
H. GARDNER,
166, Fleet Street, London,
Agent for the said J. Richardson.

page_text: I JOHN RICHARDSON of the firm Robey & Co., Lincoln, Engineers, do hereby
declare the nature of my said invention and in what manner the same is to be performed
to be particularly described and ascertained in and by the following statement:-
The object of this invention is to dispense with internal stays or tie bars without
interfering with the efficiency of the boiler.
For the purpose of my invention I make the internal shell A or fire box of
cylindrical or circular shape vertically-with contracted portions B, B, for forming a
water chamber between it and the outer shell C, also cylindrical or circular and
preferably with bulged out or enlarged portions D, D, for connection to the outer
shell C such as at the base E and at the fire door F. The dome G is circular or
capped, with over lapping edges H, H to fit on the belly plates. The back plate J
of the fire box merges from a round to a flat at K by a curve for the reception
of tubes L, L, the opposite ends of which are in a flat plate M in a cylindrical
horizontal barrel N and terminates in the smoke box P. The upper part of the back
plate by its formation somewhat contracts the fire box but forms a kind of water
bridge at K.
Figures 1 and 2 of the annexed drawings show my invention as forming part of a
boiler of the locomotive type and Figures 3 and 4 with the invention as forming part
of a vertical boiler.
The boiler thus described are made entirely independent of stays and for this
purpose every part of the internal firebox, and outside shell is made circular or
hemispherical in form so that it has no tendency to change its shape under pressure.
The only exceptions are the tube plates, and these are necessarily made flat, but
as each tube forms a stay those flat surfaces do not detract from the strength of
the boiler. The flat surface in the tube plate is formed by flanging the plate in the
manner shown that is, by forcing the tube plate inwards. This is an important
feature, and by bringing the flat surfaces back as shown in plan a full size tube plate
is obtained, the part K being bent in circular shape is as strong as any other part of
the boiler and it forms a natural water bridge, the flame from the fire striking against
it and being then turned back is well broken up and more effective than if the line
went up as shown by the dotted lines Q. It further gives the advantage of greater
length of tube surface between the tube plates J and M and admits of the tubes
being cleaned from the manhole more easily than if the tube plates were fixed at the
line Q.

page_text: The boiler can be made with barrel and tubes of any length and thus be of either
vertical or locomotive form as may be most convenient.
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 :-
Making the firebox by pressing the tube plate J into the shape shown so as to give
the flat surface the part KK being also made a portion of a cylinder so that every
part of the firebox is of either spherical or cylindrical shape the parts intersecting
each other and therefore on equilibrium in the highest pressures, the only flat surface
being abundantly stayed by the tubes L L as set forth.
H. GARDNER,
166, Fleet Street, London,.
Agent for the said J. Richardson.