IMPROVEMENTS IN STOVES AND FURNACES HEATED BY GAS
Year: 1880

page_text: LETTERS PATENT to Friedrich Carl Glaser, of Berlin, in the Kingdom of
Prussia and Empire of Germany, Engineer and Patent Agent, for an
Invention of "IMPROVEMENTS IN STOVES AND FURNACES HEATED BY GAS."
A communication from Friedrich Schaffer, of Rothenbach, near Gottesberg,
Silesia, Germany.
PROVISIONAL SPECIFICATION left by the said Friedrich Carl Glaser at the
Office of the Commissioners of Patents on the 11th March 1880.
FRIEDRICH CARL GLASER, of Berlin, in the Kingdom of Prussia and Empire of
Germany, Engineer and Patent Agent. "IMPROVEMENTS IN STOVES AND FURNACES
HEATED BY GAS." A communication from Friedrich Schaffer, of Rothenbach, near
Gottesberg, Silesia, Germany.
This Invention relates to direct heating or firing by gas, with exit for the gases
by a transverse slit as near as possible to the point where the fuel is fed in or
stoking place.
For the combustion of any kind of fuel suitable for producing gas I construct a
fire-box or fire-place, closed beneath by a sliding bottom and a grate placed above
the ash pit, at the sides by masonry or brick-work, and above mainly by an arched
roof.
The choice of fire-grate will be regulated by circumstances; that which is shown
on the accompanying Sheet of Drawing is a grate in steps, and will be found most
generally suitable. With this step grate the fuel itself will close the entrance or
mouth; with other grates, doors or similar closing apparatus must be used.
The arches of the upper division of the fire-place consist of the front wall at the
feed point or stoke opening, and of the roof of the fire-place, which lends itself to
the accumulation of the gases and protects the body or object which is to be heated
from the action of the jets of flaine.
Between these two covering parts, in about half the length of the fire-grate, is
the transverse slit for the passage of the gases.
Two different gases are evolved on the grate, namely,-
1°. Upon the first front half of this grate lighting gases are principally obtained,
which, for their perfect combustion, require the introduction of more air.
2º. On the second half of this grate are formed the heating gases, which are
more advantageously burnt without such introduction of air.

page_text: t
The transverse slit which constitutes the burner brings the two kinds of gas,
almost unmixed, to the upper heating chamber; there the air necessary for the
lighting gas is brought by a channel or conduit made in the front half of the roof
or arch, and the mixture of the two kinds of gas immediately takes place.
The aforesaid air for combustion should be first sufficiently heated;
this heating
is obtained in a sufficient manner by the movement of this air along the interior
and lower sides of the channel or conduit, which are brought by the fire to a red
heat.
The introduction of the air is regulated by suitable opening and closing
apparatuses, which may be worked together from the place occupied by the
fire-man.
Regenerators seem mostly needless for this kind of heating; they may however
be easily added where special circumstances may render them useful. The blowing
in of air beneath the grate is superfluous, trial firings having given the most
satisfactory results without it. When the heating is to be forced to the highest
point then, without any other change, a fan or blast engine may be used.
This heating requires but very little chimney draught; a column of petroleum of,
say 1 to 1 of an inch (3 to 4 m/_) is sufficient for advantageous working; it may
therefore, owing to its simplicity of construction, be adopted everywhere, for a
domestic stove as well as for any manufacturing use, and for locomotives. All
kinds of fuel or combustible materials may be burnt in this manner with a good
result. I may cite, for example, the bituminous shales or schists resulting from
the washing of the coal, and which contains 60% of ash, as also of coal sludge, wet
as withdrawn from the washing machine. The formation of scoria is particularly
slight and the management or working is therefore easy. The action of the fire on
the boiler produces an immediate vaporization when the air supply channel is
completely opened and that air has access at the stoking opening.

page_text: Between these two covering parts, in about half the length of the fire grate, is
the transverse slit for the passage of the gases.
Two different gases are evolved on the grate, namely,―
1. Upon the first front half of this grate lighting gases are principally obtained,
which, for their perfect combustion, require the introduction of more air.
2. On the second half of this grate are formed the heating gases, which are more
advantageously burnt without such introduction of air.
The transverse slit which constitutes the burner brings the two kinds of gas,
almost unmixed, to the upper heating chamber; there the air necessary for the
lighting gas is brought by a channel or conduit made in the front half of the roof
or arch, and the mixture of the two kinds of gas immediately takes place.
The aforesaid air for combustion should be first sufficiently heated; this heating
is obtained in a sufficient manner by the movement of this air along the interior
and lower sides of the channel or conduit, which are brought by the fire to a red
heat.
The introduction of the air is regulated by suitable opening and closing
apparatuses, which may be worked together from the place occupied by the
fireman.
Regenerators seem mostly needless for this kind of heating, they may however
be easily added where special circumstances may render them useful. The blowing
in of air beneath the grate is superfluous, trial firings having given the most
satisfactory results without it. When the heating is to be forced to the highest
point then, without any other change, a blast engine may be used.
This heating requires but very little chimney draught; a column of petroleum
of, say, to / of an inch (3 to 4 m/m) is sufficient for advantageous working;
it may therefore, owing to its simplicity of construction, be adopted everywhere,
for a domestic stove as well as for any manufacturing use, and for locomotives.
All kinds of fuel or combustible materials may be burnt in this manner with a
good result. I may cite, for example, the bituminous shales or schists resulting
from the washing of coal, and which contain 60% of ash, as also coal sludge wet
as withdrawn from the washing machine. The formation of scoria is particularly
slight and the management or working is therefore easy. The action of the fire
on the boiler produces an immediate vaporization when the air-supply-channel is
completely open and that the air has access at the stoking opening.
This apparatus for heating by gas, which is also very free from liability to
repairs, is consequently as simple an apparatus as may be imagined.
Having now described and ascertained the nature of the Invention communicated
to me as aforesaid, and in what manner the same is or may be performed,―
I claim as of the Invention secured to me by the hereinbefore in part recited
Letters Patent,―
In generators, the transverse slit in the arch of the generator close by the stoking
place in combination with the air inlet channel in the front wall of the smoke
casing, substantially as hereinbefore described and illustrated on the accompanying
Sheet of Drawing.
In witness whereof, I, the said Friedrich Carl Glaser, have hereunto set my
hand and seal, this Thirtieth day of August, in the year of our Lord Oue
F. C. GLASER. (L.S.)