IMPROVEMENTS BOILERS."
Year: 1876

page_text: LETTERS PATENT to Francis George Bonc, of Bermondsey, in the County of
Surrey, Boiler Maker, for the Invention of " IMPROVEMENTS
BOILERS."
IN STEAM
Sealed the 9th September 1876, and dated the 15th March 1876.
PROVISIONAL SPECIFICATION left by the said Francis George Bone at the
Office of the Commissioners of Patents on the 15th March 1876.
FRANCIS GEORGE BONE, of Bermondsey, in the County of Surrey, Boiler Maker.
"IMPROVEMENTS IN STEAM BOILERS."
This Invention relates to improvements in steam boilers.
According to my Invention I construct the shell of the boiler of cylindrical form,
and (by preference) flat at the ends, the same boing placed horizontal and sur-
mounted by the usual steam chamber. Lengthwise through the shell I place a
central tube of large dimensions, and fix same in the opposite end plates of the
shell, forming thus a stay, as well as giving heating surface, and within this tubo I
fix four (more or less) "Galloway" tubes. The position and size of this central tubo
are such that its upper surface will be some inches below the water line, and its
under surface rather a greater distance from the bottom of the boiler. On either
side of this central tube I place as many as convenient of smaller horizontal tubes
fixed also between the end plates of the shell of the boiler. The boiler is fired at
the front underneath the outer shell, and the fire thus impinging on the whole of
its under surface passes into a smoke box at the back, whence it returns through
the small tubes on either side of the central tube into a smoke box at the front of
the boiler, and thence back again through the main central tube and into the
chimney. The smoke box at the back of the boiler communicates only with the
small tubes, that at the front with both the small and the main central tubes. By
this arrangement of boiler rapid circulation is obtained through the "Galloway
tubes, and great heating surface is combined with great strength, as all the tubes
act also as stays. The union of the ends is further strengthened by gusset stays
riveted to the ends and to the cylindrical shell. The boiler is provided with the
usual and ordinary mountings. The setting simply forms a seat for the boiler,
leaving as much as possible of the under surface exposed to the action of the fire.
The furnace front, furnace, and bridge are of ordinary construction. Man-hole and
inud-hole doors are provided as convenient.
"

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Francis George Bone in the Great Seal Patent Office on the 15th
September 1876.
FRANCIS GEORGE BONE, of Bermondsey, in the County of Surrey, Boiler Maker.
"IMPROVEMENTS IN STEAM BOILERS."
This Invention relatos to improvements in steam boilers.
And in order that the same may be clearly understood and readily carried into
effect I will proceed to describe it with the aid of the accompanying Drawings,
reference being had to the letters and figures marked thereon, and in which,-
Figure 1 is an end viow, partly in elevation and partly in section, taken at the
line a, b, Figure 2.
Figure 2, a longitudinal vertical section taken at the centre line of the boiler.
Figure 3, a transverse vertical sectional back view taken at the line b, c,
Figure 2.
And Figuro 4, a horizontal section taken on the centre line of the inner tube.
The same letter of reference indicates the same part in the several Figures.
According to my Invention I construct the shell of the boiler A of ordinary
cylindrical form, and (by preference) flat at the ends, the said shell being used
horizontally, and surmounted by the usual steam chest. Lengthwise through the
shell I place a central tube B of large, dimensions, and attach same to the opposito
end plates of the shell by angle iron in the usual way, the tube B thus answering
the purpose of a stay as well as for providing heating surface, as will be herein-
after explained. Within the tube B I fix four (more or less) Galloway tubes C.
The position and size of the tube B are such that its upper surface will be the usual
distance of tops of tubes below the water line, and its under surface rather a greater
distance from the bottom of the boiler. On the opposite sides of tube B I fix
also between the end plates of the boiler as many as convenient of smaller tubes D.
The boiler is further stayed by gussets E, or in any ordinary and convenient manner.
It is fired at the front end underneath the outer shell, and is set, as shewn, in
brickwork Ę or other setting, so as to leave as much as possible of its under surface
exposed to the action of the fire. O is the fire-box, and H the space beneath,
exposing the surface of the boiler to the fire. The fire or heated products of com-
bustion after impinging on the under surface of the boiler pass into a fire or smoko
box J at the back of the boiler, whence they return through the tubes D, commu-
nicating therewith into a smoke or fire box K at the front of the boiler, and thence
back again through the main central tube B, and into the chimney. By this form
of boiler great heating surface is combined with great strength, as all the tubes for
giving heating surfaco act also as stays. The area of the opening of tube B is
continued by a section of tubing through the smoke box J, and as this part is
exposed on both sides to the action of the fire it is either made of metal encased in
fire-brick or clay, or is constructed wholly of these or such like fire-resisting material;
or this part may be made of double metal, with a water space between, the water
being supplied either by this space being in communication with the water of the
boiler, or from a reservoir of higher level than the tube. The smoke box J is pro-
vided with side doors j for facility of getting into same for any purpose required.
The furnace front, furnace, and bridge are of ordinary construction. Man-hole and
mud-hole doors are provided as convenient, and the boiler is provided with the
usual and ordinary mountings. The Galloway tubes are set in the tube B at such
an angle that they may be readily removed and replaced if required without dis-
turbing the side tubes D.
Having thus particularly described and ascertained the nature of my said Inven-
tion, and the manner in which the same is to be or may be performed, I claim as
my Invention to be secured by the horein-before in part recited Letters Patent, the

page_text: improvements in steam boilers substantially as herein-before set forth and described
and illustrated in the accompany Drawings.
In witness whereof, I, the said Francis George Bone, have hereunto set my
hand and seal, this Fifteenth day of September, in the year of our Lord One
thousand eight hundred and seventy-six.
Witness,
JOHN W*. GRAY, C.E.
Patent Agent,
16, Southampton Buildings,
W.C.
F. G. BONE. (L.S.)