IMPROVEMENTS IN THE CONSTRUCTION OF FLUES FOR STEAM- ENGINE BOILER AND OTHER FURNACES
Year: 1841

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOSEPIr
APSEY, of Cornwall Road, Lambeth, in the County of Surrey, 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 Sixth day of April, in the fourth year of Her reign, did, for
Herself, Her heirs and successors, give. and grant unto me, the said Joseph
Apsey, Her especial licence, full power, sole privilege and authority, that
I,,the said Joseph Apsey, my exors, admors, and assigns, or such others as I,
the said Joseph Apsey, my exors, adiñors, 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, use, exercise,
and vend, within England, Wales, and the Town of Berwick upon Tweed,
my Invention of "IMPROVEMENTS IN THE CONSTRUCTION OF FLUES FOR STEAM-
ENGINE BOILER AND OTHER FURNACES;" in which said Letters Patent is con-
tained a proviso that I, the said Joseph Apsey, shall cause a particular de-
scription of the nature of my said Invention, and in what manner the same is
to be performed, to be inrolled 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
Joseph Apsey, do hereby declare that the nature of my said Invention, and
the manner in which the same is to be performed, are fully described and
ascertained in and by the following statement thereof, reference being had
1

page_text: the Drawing hereunto annexed; and to the figures and letters marked thereon
(that is to say) —
My Invention relates to a mode of constructing flues to the furnaces of
steam-engine boilers and to the furnaces of other boilers, whereby the heat
from the furnaces may be more advantageously applied, and thereby econo-
mised. And in order that my Invention may be most fully understood and
readily carried into effect, I will, by the aid of the Drawing annexed, describe
the means pursued by me in carrying out my Invention. But I would first
remark, that in constructing the flues of steam-engine boiler furnaces, as well
as flues for boiler furnaces for other purposes, as heretofore practised, it is
usual so to arrange the flues that they do not rise so high as the water-line in
the boiler, and this rule of practice is of the greatest importance when pursuing
the old method of constructing flues where the products rush upwards with a
strong draft, so that the whole contents of the flues in one continued stream
flows rapidly to the outlet, which is at the upper part of the flục; and it will
be readily understood that if the flues rose bigher than the water-line of the
boiler, and the rush of heat were to be general, and the same to pass off into
the chimney above the water-line of the boiler, the metal of the boiler would
become quickly injured and destroyed. Now the object of my Invention is so
to construct the flues of steam-engine boiler furnaces and of boiler furnaces
for other purposes, that the flues may be carried above the water-line, and, in
fact, in many cases for the most part envelope the whole surface of the boiler,
and yet, owing to carrying off the products of combustion at a point below the
water-line of the boiler, the metal above the water-line will not be injured,
although the heat from the furnace will generally pervade the flues, and it will
be found that the rush or draft from the furnace to the chimney will not rise
above the water-line, but will flow in the shortest direction to the point of exit
or outlet, which, as above stated, is to be below the water-line into the chimney,
and the heat or atmosphere in the flue space above such outlet into the chim-
ney will be in a state which may properly be said to be stagnant, In con
structing flues according to my Invention; whatever be the arrangement_or
formation of the boiler, the flues are as much as possible to surround the whole
outer surface, whatever may be the position of the water-line; consequently a
workman, in carrying out my Invention, will pursue the very reverse of the
course heretofore necessary, and in constructing flues for a steam boiler furnace
or a boiler furnace for other purpose, ho will pay no attention to the water-
line within the boiler, but will extend the flue space as nearly as the circum-
stances of the particular case will allow, so as to include as much of the
external surface of the boiler as possible, and in all cases to carry up the flucs

page_text: as much as possible above the water-line of the boiler; and it only becomes
important to attend to the position of the water-line in arranging the position
of the opening or outlet of the flue or flues into the chimney, which is to be at
a point below the water-line of the boiler, in place of proceeding from the
highest part of the flue, which has heretofore been the practice when the flues
have been kept below the water-line in the boiler. By pursuing the directions
above given, it will be found that although the flues are above the water-line
of the boiler, the flow or rush of heated vapour through the flues will not be
higher that the outlet into the chimney, and all above that line may, as above
stated, be considered a stagnant heated atmosphere, which will be found very
advantageous.
Having thus generally described the nature of my Invention, I will explain
the Drawing hereunto annexed, which represents the mode of constructing
flues according to my Invention for two classes of boilers, by which, aided by
the description herein given, a workman will readily be able to construct flues
for the furnaces of other boilers, the shapes of which may differ from those
shown. Figure 1 shows the plan in section; Figure 2, a longitudinal section;
and Figure 3, a transverse section of flues, according to my Invention, for a
cylindrical boiler. Figure 4 shows a plan in section; Figure 5, a transverse
section; and Figure 6, a longitudinal section of flues, according to my Inven-
tion, for a waggon boiler. In each of these Figures the same letters indicate
the same parts. a, a, are the flues, which for the most part surround the
whole external surface of the boiler; 6 is the fire grate or furnace; c, c, is the
brickwork; d is the chimney; e is the entrance of the flue into the chimney,
the lower part of which entrance or outlet will be seen to be below the water-
line of the boiler. The dotted lines a', a', represent the position or height to
which the flue would be carried if according to the old construction.
Having thus described the best means I am acquainted with for performing
my Invention, I would remark that I do not confine myself to the precise
details shown in the Drawing, as they will require modifying for particular
cases. But what I claim is, the mode of constructing flues of steam-engine
and other boiler furnaces, whereby the same are carried above the water-line
of the boilers, and the outlet into the chimney is found below the water-line of
boilers, as above described.
In witness whereof, I, the said Joseph Apsey, have hereunto set my
hand and seal, this Sixth day of October, in the year of our Lord
One thousand eight hundred and forty-one.
JOSEPH (L.B.) APSEY.

page_text: AND BE IT REMEMBERED, that on the Sixth day of October, in the
year of our Lord 1841, the aforesaid Joseph Apsey came before our said
Lady the Queen in Her Chancery, and acknowledged the Specification afore-
said, and all and every thing therein contained and specified, in form. above
written. And also the Specification aforesaid was stamped according to the
tenor of the Statute made for that purpose.
Inrolled the Sixth day of October, in the year of our Lord One thousand
eight hundred and forty-one.