IMPROVEMENTS IN AND RELATING TO STEAM-BOILERS OR GENERATORS
Year: 1881

page_text: LETTERS PATENT to Henry Harris Lake, of the Firm of Haseltine, Lake,
& Co., Patent Agents, Southampton Buildings, London, for an Invention
of "IMPROVEMENTS IN AND RELATING TO STEAM-BOILERS OR GENERATORS."
A communication from abroad by David Renshaw, of Cohasset, and Harvey
PROVISIONAL SPECIFICATION left by the said Henry Harris Lake at the
Office of the Commissioners of Patents on the 7th February 1881.
HENRY HARRIS LAKE, of the Firm of Haseltine, Lake, & Co., Patent Agents,
Southampton Buildings, London. "IMPROVEMENTS IN AND RELATING TO STEAM
BOILERS OR GENERATORS." [A communication from abroad by David Renshaw,
of Cohasset, and Harvey T. Litchfield, of Hull, both in Massachusetts, United
States of America.]
This Invention relates to steam boilers or generators which have a large water
body amd curved circulating pipes connected therewith within a combustion
chamber; and chief novel features of the said Invention are as follows, that is to
say:
The boiler shell instead of being cylindrical is made large at the top and small
at the bottom, both bottom and top being curved and connected with each other
by flat sides. At intervals along the sides of the shell sets of concentric water
tubes are arranged vertically, the ends of the tubes being expanded into perfo-
rations in the upper and lower portions of the flat sides. The concentric tubes,
and nearly all the lower portion of the boiler shell, are enclosed within the walls
of a furnace, and the upper portion of the shell is used for a steam drum, or the
steam may be carried from it at suitable points to a steam drum conveniently
placed outside the boiler. The water line is just above the arch of the furnace,
and the feed and blow-off cocks are at the lower part of the boiler shell.
The water circulates freely down the centre of the boiler, and up through the
concentric tubes, disengaging its stean into the steam chamber or upper portion
of the boiler, the arrangement of the tubes and the nature of the furnace ensuring
a rapid and complete generation of steam.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Henry Harris Lake in the Great Seal Patent Office on the
6th August 1881.
HENRY HARRIS LAKE, of the Firm of Haseltine, Lake, & Co., Patent Agents,
Southampton Buildings, London. "IMPROVEMENTS IN AND RELATING TO STEAM-
BOILERS OR GENERATORS:" A communication from abroad by David Renshaw,
of Cohasset, and Harvey T. Litchfield, of Hull, both in Massachusetts, United States
of America.
This Invention relates to steam boilers or generators which have a large water
space and curved circulating pipes connected therewith within a combustion
chamber.
The principal features of the said Invention are as follows, that is to say :-
The boiler shell instead of being cylindrical is made large at the top and small
at the bottom, both the bottom and top being curved and connected with each
other by straight or flat sides. At intervals along the sides of the said shell sets
of concentric water tubes are arranged vertically, the ends of the tubes being
expanded into perforations in the upper and lower portions of the flat sides.
These concentric tubes and nearly all the lower portion of the boiler shell are
enclosed within the walls of a furnace, and the upper portion of the shell is utilized
as a steam drum, or the steam may be carried from it at suitable points to a steam
drum conveniently placed. outside the boiler. The water line is just above
the arch of the furnace, and the feed and blow-off cocks are at the lower part of
the boiler shell.
The water circulates freely down the centre of the boiler, and up through the
concentric tubes, disengaging its steam which passes into the steam chamber or
upper portion of the boiler, the arrangement of the tubes and the nature of the
furnace ensuring a rapid and complete generation of steam.
In the accompanying Drawing,
Figure 1 represents in transverse section a furnace with one form of my
improved steam generator applied thereto, and
Figure 2 is a side view partly in section of a portion of the same.
Figures 3 and 4 are similar views of a modified form of the said steam generator.
A represents the top of the boiler shell, A' its sides, A² its bottom; a, a, the
concentric water tubes; b, b, the fire brick of the furnace; c, c, the common
brickwork; d, the bridge-wall; e, the grate-bars; and f, the ash-pit.
Having thus fully described the said Invention as communicated to me by my
foreign correspondents, and the manner of performing the same, I wish it understood
that I claim,
The improved steam boiler or generator herein described consisting of the boiler
shell, A, A1, A2, and curved concentric water tubes a, a, upon the sides of the said
boiler shell, the whole arranged in connection with a furnace, substantially as
above set forth.
In witness whereof, I, the said Henry Harris Lake, have hereunto set my
hand and seal, this Sixth day of August, in the year of our Lord One
thousand eight hundred and eighty one.