AN IMPROVEMENT IN ADMITTING AIR TO FURNACES WHERE TUBULAR BOILERS ARE EMPLOYED
Year: 1854

page_text: LETTERS PATENT to Robert Galloway, of Lambeth, in the County of
Surrey, Engineer, for the Invention of "AN IMPROVEMENT IN ADMITTING
AIR TO FURNACES WHERE TUBULAR BOILERS ARE EMPLOYED."
Sealed the 30th May 1854, and dated the 18th January 1854.
PROVISIONAL SPECIFICATION left by the said Robert Galloway at the
Office of the Commissioners of Patents, with his Petition, on the 18th
January 1854.
I, ROBERT GALLOWAY, of Lambeth, in the County of Surrey, Engineer, do
hereby declare the nature of the said Invention for "AN IMPROVEMENT IN
ADMITTING AIR TO FURNACES WHERE TUBULAR BOILERS ARE EMPLOYED" to be as
follows:-
My Invention has for its object the consumption of smoke, as far as that
may be attained; and I effect this by admitting air into the fire through the
lower row or rows of tubes, either through the entire row or part thereof
only, according to circumstances.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Robert Galloway in the Great Seal Patent Office on the 18th
July 1854.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, ROBERT
GALLOWAY, of Lambeth, in the County of Surrey, Engineer, send greeting.

page_text: WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Eighteenth day of January, in the year of our
Lord One thousand eight hundred and fifty-four, in the seventeenth year of
Her reign, did, for Herself, Her heirs and successors, give and grant unto
me, the said Robert Galloway, Her special licence that I, the said Robert
Galloway, my executors, administrators, and assigns, or such others as I, the
said Robert Galloway, my 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
ADMITTING AIR TO FURNACES WHERE TUBULAR BOILERS ARE EMPLOYED," upon the
condition (amongst others) that I, the said Robert Galloway, by an instrument
in writing under my hand and seal, should particularly describe and ascertain
the nature of the said Invention, and in what manner the same was to be per-
formed, 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 I, the said Robert Galloway, do hereby declare the
nature of my said Invention, and in what manner the same is to be performed,
to be particularly described and ascertained in and by the following statement
thereof, reference being had to the Drawings hereunto annexed, that is to say:-
My Invention has for its object the consumption of smoke, as far as that
may be attained; and I effect this by admitting air into the fire through the
lower row or rows of tubes, either through the entire row or part thereof only,
according to circumstances. In the Drawings annexed I have shewn the
method which I adopt for carrying my Invention into effect, both in boilers
constructed upon the ordinary plan, and in boilers that may be hereafter made.
Figure 1 is a longitudinal section of an ordinary tubular boiler for marine
purposes. A, A, is the shell of the boiler; B, the furnace; and C, the fire box;
Dare the tubes; and E, the uptake to the chimney; F is one of a series of short
lengths of tubes, which are passed through the front of the smoke box and
rivetted thereto, the inner ends being inserted into the lower row of tubes D.
By this means a communication is opened between the external atmosphere
and the products of combustion in the fire box C, whereby a constant stream
or streams of air is or are caused to mix with the smoke and gases, and thereby
to insure their more perfect consumption. Figure 2 represents a similar
section of a boiler, fitted with a double smoke box door G, open at top, and
communicating with an air chamber H, into which the lower row of tubes D

page_text: opens for admitting the air to pass to the fire box, for the purpose herein-
before explained. In this arrangement the air, before passing to the fire,
becomes partially heated by contact with the smoke box E, and in consequence
of this body of air in front of the boiler the engine room is kept considerably
cooler. Should it be found desirable to give to the air a greater impetus, I
partially close the ends of the tubes by means of a ferrule or cap a, Figure 3,
inserted into them. Figure 4 is a separate view. in section; and Figure 5, an
end view of one of these caps, removed from the tubes and drawn upon an
enlarged scale. These caps may be formed of cast iron. Figure 6 is a modi-
fication of the preceding arrangement. In this boiler the air tubes are-made
of a smaller diameter than that of the fire tubes, so as to admit of their being
passed through them, whereby the air tubes become surrounded by the heated
vapours passing through the fire tubes, and thereby become considerably
heated, and impart to the air passing to the back of the furnace a propor-
tionate amount of heat.
And having now described the nature of my said Invention, and in what
manner the same is to be performed, I declare that, I claim,-
The admitting of air to furnaces, where tubular boilers are employed, through
the lower row or rows of tubes into the back of the fire, in the manner and
for the purpose herein-before described.
In witness whereof, I, the said Robert Galloway, have hereunto set my
hand and seal, this Eighteenth day of July, One thousand eight
hundred and fifty-four.
R. GALLOWAY. (L.8.)