NEW INVENTED MOVEABLE REGULATING MACHINE OR APPARATUS FOR THE IMPROVEMENT OF FIRE-PLACES AND FLUES
Year: 1795

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, I, THOMAS
CROSBEY, of the City of Bath, in the County of Somerset, Vintner, send
greeting.
WHEREAS His most Excellent Majesty King George the Third, by His
Letters Patent under the Great Seal of Great Britain, bearing date at
Westminster, the Twelfth day of January, in the thirty-fifth year of His
reign, did give and grant unto me, the said Thomas Crosby, my executors,
administrators, and assigns, His especial licence that I, the said Thomas
Crosbey, my executors, administrators, and assigns, during the term of years
therein expressed, should and lawfully might make, use, exercise, and vend,
within England, Wales, and the Town of Berwick upon Tweed, my "NEW
INVENTED MOVEABLE REGULATING MACHINE OR APPARATUS FOR THE IMPROVEMENT
OF FIRE-PLACES AND FLUES;" in which Letters Patent there is contained a
proviso, obliging me, the said Thomas Crosby, under my hand and seal, to
cause a particular description of the nature of my said Invention, and in
what manner the same is to be performed, to be inrolled in His Majesty's
High Court of Chancery within one calendar month next and immediately
after the date of the said recited Letters Patent, as in and by the same
(relation being thereunto had) will more fully appear.
NOW KNOW YE, that in compliance with the said proviso, I, the said
Thomas Crosbey, do hereby declare that the nature of my said Invention, and
the manner in which the same is to be performed, is particularly described
and ascertained in manner and form following (that is to say):-
The machine or Invention is made either of wrought iron, cast iron, copper,
brass, tin, or other metal, or of earth or clay, burnt stone or lime, or any other

page_text: hard, compact, and fit substance or substances whatever, and of such breadth
to fit the back part of any chimney or flue in which the same is to be fixed or
placed, having in front of the machine or Invention a valve or cover, of such
size and demensions as the chimney or flue in which the same is to be fixed,
to lift up and down at pleasure, by means of a handle or screw fixed to the
samo for that
purpose. The same when down will prevent all sudden gusts or
blasts of wind driving the smoke and dust into the room, and at the same time
it considerably increases the draught for the smoke to ascend, by preventing
all other communication with the upper part of the chimney or flue, but
through the machine or Invention, or the false back to be left behind the
same as is herein-after mentioned and described; on the other hand, when the
valve is raised, the draught decreases according to the height that it is raised, by
which means the draught or current of air in the flues is either lessened or
increased at pleasure. At the top of the valve, and fixed to the front of the
first plate, and which constitute the first draughts or cavities for the smoke
to ascend through, when the valve or cover is let down, are two small
tubes or pipes, to permit the smoke to ascend through, in order to create
greater draught, the size of which depend in a great measure upon the size
and dimensions of the chimney or flue in which the said machine or Invention'
is to be fixed, it being necessary for them to be larger in a kitchen chimney or
fluo than in a parlour, which said pipes or tubes are not connected with the
back draughts or cavities. The first plate against which the above-men-
tioned tubes or pipes are fixed, and which constituted the front of the first
draught or cavity, is made with many small holes to draw all dust and ashes
into the strong draught behind, which carries the same up the flues by force of
the velocity of air and smoke passing through the machine or Invention,
thereby preventing the dust and ashes from flying about the room which it
otherwise would. The second plate or partition, which makes the back of
the first draught or cavity, and front of the second draught or cavity,
for the smoke to ascend through, is likewise made with holes, either
round, oblong, square, or otherwise, of a larger size than those in the
first plate or partition, which admit the dust and ashes, and likewise the
smoke and air, more freely and in a greater degree into the back draught,
vent, or cavity, which will be made by placing the machine or Invention
against the chimney or flue, leaving a cavity or hollow at the back part
thereof in the solid stone, brick, or other materials with which the chimney,
fire-place, or flue is made of, and placing against the same a tin or other plate.
The heat of the fire acting upon the same creates a greater heat in the flue.or
cavity, which rarifies the air and smoke in a greater degree than if the back.

page_text: of the chimney, fire-place, or flue was left without placing a plate of tin or
other metal against the same, which said back, fluc, vent, or cavity has a
communication above the fire-place to receive the dust and ashes that flies
from the top of the fire, and also receives the light dust and ashes that flics
from the bottom of the fire, when moved by means of the back flue or cavity
being continued down in the solid stone or brick work with which the fire-
place is made of below the grate, which fluc, cavity, or vent creates such a
strong draught below the fire, that all light dust and ashes are drawn up the
All which flues, vents, cavities, tubes, or pipes in the said machine or
Invention are not so wide at the top as at the bottom, thereby increasing the
velocity of the air and smoke passing through the said Invention, the air being
rarified by the fire beneath, so as to accelerate and impel the ascention thereof
with great rapidity; and the sides of the said machine or Invention are made
solid and compact, so as not to admit or emit any air through the same;
which said Invention is to be fixed or placed of such height in the chimney or
flue as creates the strongest draught, and the same can easily, and at a very
small expence, be removed from one chimney or flue to another, without doing
any injury to the chimney or flue from which the same is taken or removed,
a Drawing whereof is hereunto annexed.
In witness whereof, I, the said Thomas Crosbey, have hereunto set my
hand and seal, this Sixth day of February, in-the thirty-fifth year of the
reign of our Sovereign Lord George the Third, by the grace of God, of
Great Britain, France, and Ireland, King, Defender of the Faith, &c.,
and in the year of our Lord One thousand seven hundred and ninety-
AND BE IT REMEMBERED, that on the Seventh day of February, in
the year above mentioned, the aforesaid Thomas Crosbey came before our
Lord the King in His Chancery, and acknowledged the Specification afore-
said, and all and every thing therein contained, in form above written. And
also the Specification aforesaid was stamped according to the tenor of the
Statute in that case made and provided.