AN IMPROVED MODE OF APPLYING HEAT TO CERTAIN STEAM BOILERS
Year: 1840

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JAMES
DAVIS, of Shoreditch, in the County of Middlesex, Engineer, send greeting.
WHEREAS Her present most Excellent Majesty Queen Victoria, by Her
Letters Patent under the Great Seal of Great Britain, bearing date at West-
minster, the Sixteenth day of December, in the fourth year of Her reign, did,
for Herself, Her heirs and successors, give and grant unto me, the said
James Davis, Her especial licence that I, the said James Davis, my exors,
admors, and assigns, or such others as I, the said James Davis, my exors;
admors, or assigns, should at any time agree with, and no others, from time
to time and at all times during the term of years therein expressed, should
and lawfully might make, usė, exercise, and vend, within England, Wales, and
the Town of Berwick upon Tweed, my Invention of "AN IMPROVED MODE OF
APPLYING HEAT TO CERTAIN STEAM BOILERS;" in which said Letters Patent is.
contained a proviso obliging me, the said James Davis, by an instrument in
writing under my hand and scal, particularly to describe and ascertain the
nature of my said Invention, and in what manner the same is to be per-
formed, and to cause the same to be enrolled in Her said Majesty's High
Court of Chancery within six calendar months next and immediately after
the date of the said in part recited Letters Patent, as in and by the same,
reference being thereunto had, will more fully and at large appear.
NOW KNOW YE, that in compliance with the said proviso, I, the said
James Davis, do hereby declare the nature of my said Invention to con-
sist in the application of heat to such boilers as are susceptible of such an

page_text: arrangement through the medium of coke ovens; or such like enclosed fire
chambers placed within the fire tube or fire cylinder of such boiler, so that the
flame and heat produced within the said ovens shall pass off through an aper-
ture or apertures in the crown or. arch of the same by transmission, and also
by radiation from the external surface of the said oven to the inner surface of
the fire tube of the boiler. And further, when two ovens are used for this
purpose, one placed over the other, my said Invention consists in an arrange-
ment of lateral openings or vents in the lower oven directed so as to conduct
the flame and heat from the lower oven upwards, and between the sides of the
upper oven and the inner surface of the plates of the fire tube of the boiler,
and thence passed off from over the upper oven by ordinary flues, the apertures
or vents of both ovens being so arranged as not to interfere with or essentially
to diminish the reverberating principle of the said ovens. And further, my
Invention consists in the introduction of a metallic brick or tile floor or false
bottom placed at a distance below the bottom of the lower oven, or of the oven
when one only is used, upon which combustion may readily be produced, for
the purpose of aiding the conversion of the fuel into coke. And in further
compliance with the said proviso, I, the said James Davis, do hereby describe
the manner in which my said Invention is to be performed by the following
statement thereof, reference being had to the Drawing annexed, and to the
figures and letters marked thereon, that is to say:-
DESCRIPTION OF THE DRAWING.
Figure 1 is a longitudinal section of a single oven in a boiler, to which an
oven is shown applied according to my said Invention. A, A, is the boiler;
B, B, the fire tube of the same; C, the oven; and D, the false bottom afore-
said placed below the bottom of the oven; E is the fire door of the oven;
F, the flue of the fire tube of the boiler; and G, the opening from the oven
into the fire tube H; H is the water to be heated; and I, I, the brickwork.
in which the boiler is set. Figure 2 is an end section of the same boiler with-
out the brickwork in which it is set; similar letters being used to denote
similar parts in all the Figures. Figure 3 is a longitudinal section of a double
oven boiler, having one oven placed over the other, and representing at the
same time how a double oven may be set at each end of a boiler with a
division in the middle of the firo tube. J is the said division, and K, K, the
lower ovens, having apertures marked L, to let the heat and flame escape over
the top of the upper oven, and better shewn in. section at Figure 4, where
P is an air opening for letting off. the damp. Figure 5 shews a section taken
on the line M, N, of Figure 3.

page_text: Now whereas I claim as my Invention the application of, heat for
generating steam in steam boilers or generators by placing an oven or ovens
with such arrangements of flues, apertures, and false bottoms as aforesaid
within the fire tube of a steam boiler or steam generator in manner aforesaid,
and such my Invention being, to the best of my knowledge and belief, entirely
new and never before used within that part of Her said Majesty's United
Kingdom of Great Britain and Ireland called England, Her said Dominion of
Wales, or Town of Berwick upon Tweed, I do hereby declare this to be my
Specification of the same, and that I do verily believe this my said Specifica-
tion doth comply in all respects fully and without reserve or disguise with the
proviso in the said herein-before in part recited Letters Patent contained.
Wherefore I hereby claim to maintain exclusive right and privilege to my said
Invention.
In witness whereof, I, the said James Davis, have hereunto set my
hand and seal, this Sixteenth day of June, in the year of our Lord One