IMPROVEMENTS IN AND CONNECTED WITH STEAM GENERATORS
Year: 1874

page_text: LETTERS PATENT to Thomas Vicars, the elder, and Thomas Vicars,
the younger, both of Liverpool, in the County of Lancaster,
Engineers, and James Smith, of the same Place, Baker, for the In-
vention of "IMPROVEMENTS IN AND CONNECTED WITH STEAM GENERAtors
the younger, both of Liverpool, in the County of Lancaster,
Engineers, and James Smith, of the same Place, Baker, for the In-
vention of "IMPROVEMENTS IN AND CONNECTED WITH STEAM GENERATORS
AND FURNACE
دو
Sealed the 17th November 1874, and dated the 20th May 1874.
PROVISIONAL SPECIFICATION left by the said Thomas Vicars, the elder,
Thomas Vicars, the younger, and James Smith, at the Office of the
Commissioners of Patents, with their Petition, on the 20th May
1874.
We, THOMAS VICARS, the elder, and THOMAS VICARS, the younger, both
of Liverpool, in the County of Lancaster, Engineers, and JAMES SMITH,
of the same Place, Baker, do hereby declare the nature of the said
Invention for "IMPROVEMENTS IN AND CONNECTED WITH STEAM GENERATORS AND
FURNACES," to be as follows:-
The objects of the said Invention are,―
(1.) To provide a steam generator which shall, as regards production

page_text: flued, or Lancashire double flued boiler, with the capability to resist
high pressure possessed by boilers of the tubulous type.
(2.) To secure in internal flued boilers the economy and efficiency
arising from the use of a large externally flued furnace or fire-place.
To secure the advantages first above named we, under our Invention,
take three cylindrical shells of equal length and place them triangularly
one above and two below. Each of the bottom shells is connected to the
top shell by two or more circulation tubes. Each of the lower cylin-
drical shells is formed with a central flue running its entire length
through which the gases of combustion pass, to be further carried along
or through side flues or otherwise as may be deemed best, to the
chimney. From the bottom of the front of each of the lower shells
circulation tubes are led to a higher part of the front of the same shell
to the front of the top shell, or part to a lower shell and part to the top
shell. The said circulation tubes are led forward a sufficient distance
to form the crown or top of the furnace.
To secure the advantages second above mentioned we attach across
the bottom of the front of a Cornish, Lancashire, or other internal flued
boiler, a cylindrical vessel which has connected thereto and projecting
therefrom circulation tubes; such circulation tubes re-enter the boiler
above the said vessel below the water line. The said projecting circula-
tion tubes form the crown or top of the furnace.
Boilers constructed as above described under our Invention may be
fired by any arrangement of fire-bars, doors, or furnaces, however they
the said boilers are used in combination with external furnaces or fire-1
places, such furnaces or fire-places being provided, by preference, with
our well-known self-stoking mechanism.
In using a large external furnace in combination with the above or
other steam generator it is sometimes found advantageous to make one
or more of the bars or each alternate bar a water bar. These bars when
used are connected to the generator at the bridge end of the furnace by
a cross tube or otherwise, and at the inner front end of the furnace to a
similar cross tube, from which a vertical or nearly vertical tube or
several tubes is or are connected direct to the generator, or to one or
more of the tubes forming the top or crown of the furnace.
When our self-stoking arrangement of moving bars is used with water-
bars connected into a steam generator we alternate our moving bars

page_text: with stationary water bars.
The vertical or nearly vertical tube or
tubes protect the front of the furnace, and in combination with the
water bars and connections promote circulation:
SPECIFICATION in pursuance of the conditions of the Letters Patent
filed by the said Thomas Vicars, the elder, Thomas Vicars, the
younger, and James Smith in the Great Seal Patent Office on the
20th November 1874.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, THOMAS
VICARS, the elder, and THOMAS VICARS, the younger, both of Liverpool,.
in the County of Lancaster, Engineers, and JAMES SMITH, of the same
Place, Baker, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twentieth day of May, in the year of
our Lord One thousand eight hundred and seventy-four, in the thirty-
seventh year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto us, the said Thomas Vicars, the elder, Thomas
Vicars, the younger, and James Smith, Her special licence, that we,
the said Thomas Vicars, the elder, Thomas Vicars, the younger, and
James Smith, our executors, administrators, and assigns, or such others
as we, the said Thomas Vicars, the elder, Thomas Vicars the younger,
and James Smith, our executors, 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, should and law-
fully might make, use, exercise, and vend, within the United Kingdom
of Great Britain and Ireland, the Channel Islands, and Isle of Man,
an Invention for " IMPROVEMENTS IN AND CONNECTED WITH STEAM GENERATORS
AND FURNACES," upon the condition (amongst others) that we, the said
Thomas Vicars, the elder, Thomas Vicars, the younger, and James
Smith, our exccutors or administrators, by an instrument in writing
under our, or their, or one of their hands and seals, particularly describe
and ascertain the nature of the said Invention, 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.
.

page_text: NOW KNOW YE, that we, the said Thomas Vicars, the elder, Thomas
Vicars, the younger, and James Smith, do hereby declare the nature
of our said Invention, and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the
following statement, refrence being had to the accompanying two
Sheets of Drawings, and to the figures and letters marked thereon, (that
is to say) :-
(1.) To provide a steam generator which shall, as regards production
of steam, combine the steadiness and regularity of the Cornish single
flued or Lancashire double flued boiler, with the capability to resist high
pressure possessed by boilers of the tubulous type.
(2.) To secure in internal flued boilers the economy and efficiency
arising from the use of a large externally placed furnace or fire-place.
To secure the advantages first above named we, under our Invention,
take three cylindrical shells of equal length and place them triangularly
one above and two below. Each of the bottom shells is connected to
the top shell by two or more circulation tubes. Each of the lower
cylindrical shells is formed with a central flue running its entire length
through which the gases of combustion pass to be further carried along
or through side flues or otherwise, as may be deemed best, to tho
chimney. From the bottom of the front of each of the lower shells
circulation tubes are led to a higher part of the front of the same shell
to the front of the top shell, or part to a lower shell and part to the top
shell. The said circulation tubes are led forward a sufficient distance to
form the crown or top of the furnace.
To secure the advantages second above mentioned we attach across
the bottom of the front of a Cornish, Lancashire, or other internal flued
boiler, a cylindrical vessel which has connected thereto and projecting
therefrom circulation tubes; such circulation tubes rc-enter the boiler
above the said vessel below the water line. The said projecting circula-
tion tubes form the crown or top of the furnace.
Boilers constructed as above described, under our Invention, may be
fired by any arrangement of fire-bars, doors, or furnaces, however they
the said boilers are used, in combination with external furnaces or fire-

page_text: tubes carried forward over the furnace to the vessel r, returning again
to the upper part of the generator by the tubes s and vessel t.
8
Fig. 8 is a front elevation, and Fig. 9 a sectional side elevation
showing our improvements attached to a single flued or Cornish boiler.
p, lower vessel; q, circulation tubes; r, middle vessel; 8, return tubes
to upper vessel and boiler.
Having now described the nature of our said Invention, and particu-
larized the same, we would have it understood that we do not confine
ourselves to details, but what we claim is,—
First. The combination of the three cylindrical shells of equal length,
a, b, with the circulation tubes f, substantially as described and illus-
trated for the purposes set forth.
Second. The combination of the three cylindrical shells a, b, with the
circulation tubes g, substantially as described and illustrated for the
purposes set forth.
Third. The three cylindrical shells a, b, and water bars k arranged
and combined, substantially as and for the purposes set forth.
Fourth. In combination with Cornish or Lancashire boilers of the
parts p, q, r, s, and t, substantially as described and illustrated for the
purposes set forth.
In witness, whereof, we, the said Thomas Vicars, the elder, Thomas
Vicars, the younger, and James Smith, have hereunto set our
hands and seals, the Eighteenth day of November, in the year
of our Lord One thousand eight hundred and seventy-four.
THOMAS VICARS, THE ELDER.
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