IMPROVEMENTS IN STEAM GENERATORS GENERATOR
Year: 1879

page_text: LETTERS PATENT to Thomas Russell, of the Firm of Hall, Russell, and Com-
pany, of the City and County of Aberdeen, North Britain, Engineers and Ship-
builders, for the Invention of "IMPROVEMENTS IN STEAM GENERATORS." A
communication from abroad by George Jamieson Scott, of Calcutta, in the
Empire of India.
Sealed the 30th January 1880, and dated the 5th August 1879.
PROVISIONAL SPECIFICATION left by the said Thomas Russell at the
Office of the Commissioners of Patents on the 5th August 1879.
THOMAS RUSSELL, of the Firm of Hall, Russell, and Company, of the City and
County of Aberdeen; North Britain, Engineers and Shipbuilders. "IMPROVEMENTS
IN STEAM GENERATORS." A communication from abroad by George Jamieson
Scott, of Calcutta, in the Empire of India.
The said Invention relates to improvements in steam generators, and consists in
forming the sides of the combustion chamber of tubes or their equivalents, which
communicate at their upper ends with the upper part of the water space of the
boiler, their lower ends communicating with the lower part of the water space
below the fire bars of the boiler, either directly, or by being led into a chamber
which is in communication with the said lower part of the water space. The sides
of the combustion chamber may consist of one or more lines or rows of tubes, in
the latter case the tubes of the one row preferably break joint with those of the
row next it. The Invention is applicable to externally fired boilers, as well as to
internally fired boilers, and to boilers generally. By its use a greatly increased
heating surface is obtained, and the circulation of the water within the boiler is
improved, and heavy brickwork which is now used in certain boilers may be dis-
pensed with. In the case of internally fired boilers, the leakage that at present
takes place at the bottom seams will be reduced or prevented.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Thomas Russell in the Great Seal Patent Office on the 3rd February
1880.
THOMAS RUSSELL, of the Firm of Hall, Russell, and Company, of the City and
County of Aberdeen, North Britain, Engineers and Shipbuilders. "IMPROVEMENTS
IN STEAM GENERATORS." A communication from abroad. by George Jamieson
Scott, of Calcutta, in the Empire of India.
The said Invention relates to improvements in steam generators, and consists in
forming the combustion chamber as hereinafter described. The said Invention is
applicable to internally or externally fired boilers, and to boilers or steam generators
generally.
Figure 1 represents in back elevation, and Figure 2 in longitudinal vertical
section, a marine boiler having a combustion chamber constructed according to this
Invention. The sides of the said chamber are formed of tubes A, which are curved
as shewn, or to any other suitable curve, and communicate at their upper ends with
the upper part of the water space of the boiler, their lower ends communicating
with the lower part of the water space below the fire bars of the boiler, either
directly, or as shewn in the Drawing, by being led into a tube or chamber B which
communicates by means of the pipe C with the said lower water space. In the
Drawing, two rows or lines of tubes A are shewn, the one being outside the
other, and breaking joint therewith, but one row or more than two rows of tubes
may be employed as desired. The said tubes are enclosed in a casing D. In
Figures 3 and 4 are shewn respectively a back elevation and a longitudinal vertical
section of externally fired boilers to which the Invention is applied. The tubes A
communicate with the upper part of the water space, and the lower ends with a
chamber B, as in the arrangement first described. The said chamber B communi-
cates by the pipe C with the legs E of the boiler below the level of the fire bars.
The casing D is omitted from Figures 1 and 3, the more clearly to shew the
arrangement of the tubes. In Figure 3, one of the boilers is shewn with one of the
rows of tubes removed.
By the use of this Invention, a greatly increased heating surface is obtained, the
circulation of water within the boiler is improved, and the leakage which at present
takes place at the bottom seams will be reduced or prevented. Also it enables
some heavy brickwork which is now used in certain boilers to be dispensed with.
It will be understood that the chamber B may be extended to receive the tubes A
of the combustion chambers of any number of boilers placed side by side, a division
being placed in the chamber B so as to cut off the communication from one boiler
to another, the lower part of the water space of each boiler communicating by a
pipe C with the said chamber B.
Having now described and particularly ascertained the nature of the said Inven-
tion, and the system, mode, or manner in or under which the same is or may be
used or practically carried into effect, I would observe in conclusion that what I
consider to be novel and original, and therefore claim as the Invention secured to
me by the herein before in part recited Letters Patent is,―
The improvements in steam generators, consisting in forming their combustion
chambers of tubes, as herein before described.
In witness whereof, I, the said Thomas Russell, have hereunto set my hand
and seal, this Twenty fourth day of January, in the year of our Lord One
thousand eight hundred and eighty.