IMPROVEMENTS IN FURNACES
Year: 1876

page_text: LETTERS PATENT to Henry Houldsworth Grierson, of Manchester, in the
County of Lancaster, Engineer, for the Invention of "IMPROVEMENTS IN
FURNACES."
Sealed the 15th June 1877, and dated the 18th December 1876.
PROVISIONAL SPECIFICATION left by the said Henry Houldsworth Grierson
at the Office of the Commissioners of Patents on the 18th December 1876.
HENRY HOULDSWORTH GRIERSON, of Manchester, in the County of Lancaster,
Engineer. "IMPROVEMENTS IN FURNACES."
My Invention consists in a method of admitting air to furnaces, whereby the
smoke arising therefrom is more perfectly consumed and a nuisance consequently
prevented or abated, while at the same time an economy in fuel is effected. To
accomplish these objects I divide the fire-bars longitudinally into two or more com-
partments by means of two or more plates constituting a hollow inidfeather or
feathers open at top and bottom, and extending upward to about the level of the
highest part of the fuel when the furnace is fed, and air therefrom passes upward
through the hollow divisions. The plates may be perforated on their sides and
extended throughout the length of the fire-bars, or partly so, and instead of
continuous plates detached channels may extend upward as above described.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Henry Houldsworth Grierson in the Great Seal Patent Office on the
18th June 1877.
HENRY HOULDSWORTH GRIERSON, of Manchester, in the County of Lancaster,
Engineer. "IMPROVEMENTS IN FURNACES."
Fig. 1 represents one form of my improvement in longitudinal section, and Fig. 2
is a transverse section thereof. At a, a, are the usual fire-bars, upon the front
portion of which I place a midfeather b, c, formed hollow, as seen in the transverse
section, and provided with a recessed foot at bottom which fits on two adjacent fire-
bars. The midfeather b, c, is provided with two series of side apertures d, e, and it
ID 77

page_text: is in this case supposed to be made of fire-clay. The Drawing represents it as
made in three parts 1, 2, 3, for the convenience of manufacture and for economy of
renewal should it become partially broken. In making up the fire the highest level
thereof should not extend above the midfeather. In operation the air passes from
the ash-pit fup the hollow space g, and issues therefrom through the two series of
apertures d, e, inpinging upon the fuel and causing a consumption of smoke.
Figs. 3 and 4 represent a modification of the above described arrangement.
The three parts of the midfeather 1, 2, 3, in this instance are straight at bottom
and rest within a recess formed in two adjacent fire-bars. The parts 1, 2, 3, arc
not in this case formed with one hollow part, but are provided with a series of
central passages h, the tops of which communicate with transverse piercings d, e,
which act precisely as those described in reference to Figs. 1 and 2.
Fig. 5 shews a method of making the midfeather of iron. In this case two of the
fire-bars are continued upward, as at k, l, and are united at top by a longitudinal
bar m, thus leaving a space n from which the air issues through the apertures d, e.
Instead of forming the midfeather as above described it might be made up by a
series of detached tubes, with side and also if desired with top openings, and other
similar modifications may also be adopted, and instead of applying the said mid-
feather to the front bars only, it may also be placed at the back.
Having thus described and ascertained the nature of my said Invention and the
manner in which the same is to be performed, I desire it to be understood that
I claim as secured to me under the above in part recited Letters Patent and for the
purpose above set forth, the use of the air-conveying midfeather or other such part,
substantially as described.
In witness whereof, I, the said Henry Houldsworth Grierson, have hereunto
set my hand and scal, this Sixteenth day of June, in the year of our Lord
One thousand eight hundred and seventy-seven.
TT HATTY SIFARTH PERSON
1