IMPROVEMENTS IN STEAM BOILERS
Year: 1880

page_text: LETTERS PATENT to Friedrich Carl Glaser, of Berlin, in the Kingdom of
Prussia and Empire of Germany, Engineer and Patent Solicitor, for an
Invention of "IMPROVEMENTS IN STEAM BOILERS." A communication by
Jean Louis Piedboeuf, of Dusseldorf, in the German Empire.
PROVISIONAL SPECIFICATION left by the said Friedrich Carl Glaser at
the Office of the Commissioners of Patents on the 25th August 1880.
FRIEDRICH CARL GLASER, of Berlin, in the Kingdom of Prussia and Empire
of Germany, Engineer and Patent Solicitor. "IMPROVEMENTS IN STEAM BOILERS."
[A communication by Jean Louis Piedboeuf, of Dusseldorf, in the German Empire.]
This Invention relates to steam boilers of the kind in which there are two or
more compartments one above the other, and consists in a construction whereby
steam space is provided, and the water level is maintained approximately constant in
the lower compartments as I will describe, referring to the accompanying Drawings.
Fig. 1 is a part elevation and part transverse section of a boiler having two
compartments, the lower a double flued Cornish boiler, and the upper a tubular
boiler; Fig. 1a is a longitudinal section of the same. In the upper part of the
lower compartment I fix a cross partition B extending some distance down, thus
forming a steam chamber which occupies the greater part of the crown.
chamber communicates by a pipe D with the steam space of the upper compartment,
the passage being governed by a valve C worked by a float E, so that when the
pressure in the lower steam chamber is such as to depress the water level therein,
the float E descending causes the valve C to open, allowing the steam to pass into
the upper compartment, and the water level consequently to rise in the lower
steam chamber. A is the communication for water between the two compartments
of the boiler. Modified constructions of the steam chamber in the lower compart-
ment are shewn in the transverse and longitudinal sections, Fig. 2 and Fig. 2º and
Fig. 3 and Fig. 3a, the chambers in these cases being open bottomed vessels fixed in
the lower compartments of the boilers.
This

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Friedrich Carl Glaser in the Great Seal Patent Office on the 24th
February 1881.
FRIEDRICH CARL GLASER, of Berlin, in the Kingdom of Prussia and Empire
of Germany, Engineer and Patent Solicitor. "IMPROVEMENTS IN STEAM BOILERS."
A communication by Jean Louis Piedboeuf, of Dusseldorf, in the German Empire.
This Invention relates to steam boilers of the kind in which there are two or
more bodies or compartments at different levels, and consists in providing in each
such body or compartment a separate steam space instead of providing such steam
space in the upper compartment alone. The accompanying Drawing shews various
constructions of boilers with the said Invention applied thereto.
Figs. 1, 2, and 3 shew respectively a longitudinal section, a part end view, and
part cross section on line X, X, Fig. 1, of an arrangement in which the lower part
of the boiler consists of an internal flued Cornish boiler of ordinary construction,
communicating at the rear end by the tube P with the upper part which is a
tubular boiler. The lower part has at W near the tube P a segmental plate
secured steam tight to the upper part of the shell, and reaching with its lower edge
down to a certain distance above the top of the flue tube. By this means the top
space of this boiler is divided into two compartments, in the front larger one of
which steam accumulates, as it cannot pass away through P into the upper boiler.
As the steam accumulates it forces down the level of the water in that space until
it stands at a certain height above the flue tube, thus forming the requisite steam
space for the lower boiler. This space communicates with the steam space of the
upper boiler by a pipe R, having in it a single beat valve V opening freely
upwards, as shewn more clearly in the enlarged section of this part at Figs. 4
and 5. As a matter of precaution this valve is connected by an extended stein to
the lever of a float S in the lower boiler, whereby the valve is automatically
opened, when by the accumulation of steam the water level of the lower steam
space sinks beyond a certain point, and whereby also the float will tend to close
the valve when the said water level rises beyond a certain point. This automatic
arrangement is however not essentially necessary.
As
By the above described arrangment, which can be applied to all kinds of
combined boilers, it is possible to have a steam space both in the lower and the
upper bodies or compartments while the water circulates freely through both.
the steam is formed in the lower compartment it passes quietly off through the
stand pipes into the upper steam space, there being always a certain unbalanced
head of water in the back part of the boiler (where the two bodies or compartments
communicate) to insure the proper motion of the steam.
The furnace gases are carried upwards from the back of the Cornish boiler and
pass to the front through the tubes of the upper boiler, and then back again in the
space surrounding the shells, so that there is no danger of the shells being burnt.
Also, by thus combining an internal flued boiler, having a steam space with an
upper boiler or compartment, the danger of accident from low water will be a
very small one as compared to a simple Cornish boiler of ordinary construction, as
the crown of the furnace flue cannot become uncovered unless the water level falls
about 7 ft., leaving the upper compartment entirely empty, which could hardly
happen without notice.
Figs. 6 and 7 shew different arrangements of the before described float and
valve, by which the use of a connecting lever is dispensed with and a stop provided
for limiting the descent of the float. By thus arranging the valve within the
lower body of the boiler the construction is simplified.
Figs. 8 to 15 shew the application of the Invention to various other forms of
boilers, in which the valve is arranged in different ways according to the special

page_text: construction of the boiler. In the arrangements at Figs. 12 to 15 the steam
chamber to the lower body of the boiler is formed by a separate open bottomed
vessel fixed therein.
Having thus described the nature of the said Invention and in what manner the
same is to be performed, as communicated to me by my correspondent, I wish it to
be understood that I do not limit myself to the arrangements for carrying out the
said Invention shewn on the accompanying Drawings, as the said Invention may
be carried out in a variety of ways, but I claim,―
First. Providing each body or compartment of a combined steam boiler with a
separate steam space by means of a transverse plate or diaphragm W, or its
equivalent, fixed in the lower body or bodies, the steam space in the lower body
or bodies being made to communicate with the steam space of the upper body
or bodies by means of a pipe or passage provided with a valve, substantially as
herein described.
Second. In combination with the arrangement of steam space in the lower body
of a combined boiler and its communicating pipe and valve as set forth in the
preceding claim, the use of a float in the lower body connected to the said valve
so as to open it automatically and allow steam to pass into the upper body when
the water level of the lower steam space sinks below a certain point.
Third. The arrangements, herein described and shewn at Figs. 1 to 3 and 8 to 15
of the Drawings for providing separate steam spaces in the lower bodies or
compartments of steam boilers.
Fourth. The arrangements, herein described with reference to Figs. 4, 5, 6, and 7
of the Drawings, for automatically opening the communicating valve by means
of a float when the water level of the lower steam space sinks beyond a certain
point.
In witness whereof, I, the said Friedrich Carl Glaser, have hereunto set
my hand and seal, this Eighteenth day of February, in the year of our
Lord One thousand eight hundred and eighty one.
F. C. GLASER. (L.S.)