IMPROVEMENTS IN THE CONSTRUCTION OF STEAM BOILERS AND IN SETTING THE SAME.
Year: 1875

page_text: LETTERS PATENT to Charles Mace, Engineer, and John Dickinson,
Engine Builder, both of Sunderland, in the County of Durham,
for the Invention of "IMPROVEMENTS IN THE CONSTRUCTION OF STEAM
BOILERS AND IN SETTING THE SAME.
"
Sealed the 11th May 1875, and dated the 12th March 1875.
PROVISIONAL SPECIFICATION left by the said Charles Mace and
John Dickinson at the Office of the Commissioners of Patents, with
their Petition, on the 12th March 1875.
We, CHARLES MACE, Engineer, and JOHN DICKINSON, Engine Builder,
both of Sunderland, in the County of Durham, do hereby declare the
nature of the said Invention for "IMPROVEMENTS IN THE CONSTRUCTION OF
STEAM BOILERS AND IN SETTING THE SAME," to be as follows:-
This Invention relates to improvements in that class of steam boilers
which are formed of groups of small cylinders, around which the flame
and heated gases of the furnace are free to circulate, the chief object
being to procure large heating surface and high pressure, and to facilitate
the instant disconnection of any part of the outer casing or framing of
the setting, so as to provide for the free inspection, cleaning, and repairing
of any part, thereby providing increased security.

page_text: The boiler consists of one or more sections of small cylinders, each
section consisting of two or more cylinders of wrought iron or other
material connected together by two or more tubes, so as to allow of free
circulation of the steam and water from one to the other; and the said
cylinders are moreover filled with small tubes of any approved material
in such a manner that the gases can freely pass from end to end,
imparting their heat to the water. The cylinders are furthermore
connected together at the bottom by transverse tubes, and at the top by
one or more transverse steam receivers, thereby causing the whole to be
bound together in a rigid manner. The fire-bars are placed below the
boiler, and the flame and heated gases from the fire pass below the boiler
to a combustion chamber at the back, and circulating around the
exterior of the cylinders and through the tubes which pass through
them the heated gases pass to a smoke box at the front of the boiler, and
from thence to the chimney or flue.
The setting of the boiler consists of cast-iron frames filled with fire-
bricks, and these frames are so made and placed as to allow of any part
of same being instantly removed to allow of inspection.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Charles Mace and John Dickinson in the Great Seal
Patent Office on the 11th September 1875.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, CHARLES
MACE, Engineer, and JOHN DICKINSON, Engine Builder, both of
Sunderland, in the County of Durham, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twelfth day of March, in the year of
our Lord One thousand eight hundred and seventy-five, in the thirty-
eighth year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto us, the said Charles Mace and John Dickinson, Her
special license that we, the said Charles Mace and John Dickinson, our
executors, administrators, and assigns, or such others as we, the said
Charles Mace and John Dickinson, our exccutors, administrators, and
assigns, should at any time agree with, and no others, from time to
time and at all times thereafter during the term therein expressed,

page_text: should and lawfully might make, use, exercise, and vend, within tho.
United Kingdom of Great Britain and Ireland, the Channel Islands,
and Isle of Man, an Invention for "IMPROVEMENTS IN THE CONSTRUCTION
OF STEAM BOILERS AND IN SETTING THE SAME," upon the condition (amongst
3 others) that, we, the said Charles Mace and John Dickinson, our exe-
cutors or adminstrators, by an instrument in writing under our, or
their hands and seals, or under the hand and seal of one of us or them,
should particularly describe and ascertain the nature of the said In-
vention, and in what manner the same was to be performed, and
cause the same to be filed in the Great Seal Patent Office within six
calendar months next and immediately after the date of the said Letters
Patent.
NOW KNOW YE, that we, the said Charles Maco and John Dickinson,
do hereby declare the nature of the said Invention, and in what
manner the same is to be performed, to be particularly described and
ascertained in and by the following statement thereof, that is to
say :-
This Invention relates to improvements in that class of steam boilers
which are formed of groups of small cylinders, around which the flame
and heated gases of the furnace are free to circulate, the chief object
being to procure large heating surface and high pressure, and to facilitate
the instant disconnection of any part of the outer casing or framing of
the setting so as to provide for the free inspection, cleaning, and repairing
of any part, thereby providing increased security.
The boiler consists of one or more sections of small cylinders, each
section consisting of two or more cylinders of wrought iron or other
material connected together by two or more tubes, so as to allow of free
circulation of the steam and water from one to the other; and the said
cylinders are moreover filled with small tubes of any approved material
in such a manner that the gases can freely pass from end to end,
imparting their heat to the water. The cylinders are furthermore
connected together at the bottom by transverse tubes, and at the top by
one or more transverse steam receivers, thereby causing the whole to be
bound together in a rigid manner. The fire-bars are placed below the
boiler, and the flame and heated gases from the fire pass below the boiler
to a combustion chamber at the back, and circulating around the
exterior of the cylinders and through the tubes which pass through

page_text: them the heated gases pass to a smoke box at the front of the boiler,
and from thence to the chimney or fluo.
The setting of the boiler consists of cast-iron frames filled with fire-
bricks, and theso frames are so made and placed as to allow of any part
of same being instantly removed to allow of inspection.
Figure 1 of the Drawings hereunto annexed shows a front elevation,
partly in section; Figure 2, a back elevation, partly in section; Figure 3,
a longitudinal section; and Figure 4 a plan of a steam boiler constructed
and set in the manner above described. In theso Figures A is the
chimney; B, B, wrought-iron cylinders arranged in pairs one above the
other; C, C, tubes connecting together the cylinders of each pair, and
also connecting them to a steam receiver D, and to tubular mud boxes F,
by which the boiler is carried. The tubes F rest on girders G as shown;
Hare the furnaces; I, the fire-bars; E, the smoko box; J, the bridge;
K, the casing, within which the boiler is enclosed. This casing is as
shown composed of cast-iron gratings with the several spaces of the
grating filled in with fire-bricks. The sides of the furnace and back and
top of combustion chamber are all made in this manner, the several
sections or gratings being securely fastened to each other and in such a
manner that any one or other of them may be quickly removed whenever
desired.
Having thus described the nature of our Invention, and the manner
of performing the same, we would have it understood that we claim, the
construction and setting of steam boilers, substantially in the manner
above described.
In witness whereof, we, the said Charles Mace and John Dickinson,
have hereunto set our hands and seals, this Ninth day of
September, in the year of our Lord One thousand eight hundred
and seventy-five