IMPROVEMENTS IN SELF-STOKING FURNACES, AND IN STEAM GENERATORS
Year: 1875

page_text: L
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 Invention of
2
"
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
13th February 1875.
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 SELF-STOKING FURNACES, AND IN STEAM
GENERATORS," to be as follows:-

page_text: consists in removing partly or entirely the furnace bridge, so as to allow
a larger mass or larger masses of clinker and half-burned fuel to be
pushed by our reciprocating grate bars on to a plate, thence into the
ashpit or flue. In some cases we employ an auxiliary grate to catch the
falling fuel or clinker. The partly consumed clinker or fuel in the ash-
pit or flue forms an auxiliary fire, and burns until entirely consumed or
nearly so.
Second. To improvements in the system of steam generators for which
we obtained Her Majesty's Letters Patent of the year 1874, under the
serial numbers 699 and 1773, and consists in forming the whole or part
of the sides, top, or crown of the furnace of a water space bounded on
the inside by a corrugated shell or wall in place of the tubes heretofore
specified.
Third. To the application of the improvements described under the
above second head to Lancashire or Cornish boilers, with the addition
of diaphragms or partitions in the said water space to promote cir-
culation.
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
11th August 1875.
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 Thirteenth day of February, 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 suc-
cessors, 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

page_text: 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
lawfully 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 SELF-STOKING FURNACES, AND
IN STEAM GENERATORS," upon the condition (amongst others) that we,
the said Thomas Vicars, the elder, Thomas Vicars, the younger, and
James Smith, our executors or administrators, by an instrument in
writing under our, or their, or one of their hands and seals, should
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.
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 performed,
to be particularly described and ascertained in and by the following
statement, reference being had to the accompanying Sheet of illustrative
Drawings and to the figures and letters marked thereon, that is to

page_text: culation.
DESCRIPTION OF THE DRAWINGS.
Figs. 1 and 2 are illustrative of the first part of our Invention. a,
generator; b, flue; c, reciprocating grate bars; d, plate on to which
clinker falls, to be afterwards pushed off by the bars c into the flue b.
In some cases the partly consumed fuel, after leaving d, falls on to an
auxiliary grate e, as shown in Fig. 4. If desired the plate d may form
part of the boiler or generator and form a water bridge.
Fig. 3 is a transverse section, Fig. 4 a longitudinal vertical section,
and Fig. 5 a longitudinal horizontal section, all of a steam generator
constructed under our Invention, and illustrative of the first and second
parts thereof. a, boiler; b, flues; c, reciprocating grate bars; d, clinker
plate; e, auxiliary grate. The sides and top or crown of the furnace f
are formed by the water space g corrugated internally. / are circulation
tubes.
Fig. 6 is a transverse section of a Cornish boiler constructed under
our Invention, and illustrative of the third part thereof. a, boiler;
b, flue; c, reciprocating grate bars; g, corrugated water space forming top
and sides of furnace; h, circulation tubes; i, diaphragms for promoting
circulation. This part of our Invention is also applicable to Lancashire
boilers.
Having now particularly described and ascertained the said Invention
so that others will be enabled to carry our improvements into effect, we
claim,―
Under the first head. The arrangement in combination of the clinker
receiving plate d and bars c with or without the auxiliary grate e,
substantially as described and illustrated.
Under the second head. The employment in combination with the

page_text: generator a of the corrugated water space g, substantially as described
and illustrated.
Under the third head. The water space 9 diaphragms i, in com-
bination with a Cornish or Lancashire boiler with or without the
circulation tubes h, substantially as described and illustrated.
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 Seventh day of August, in the year of our
Lord One thousand eight hundred and seventy-five.
THOMAS VICARS, THE ELDER.
(L.S.)
THOMAS VICARS, THE YOUNGER. (L.S.)
JAMES SMITH.
(L.S.)
JAMES JOHNSON,
Patent Office,
Witness.
Clayton Square,
Liverpool,