AN IMPROVED COMBINED STEAM ENGINE AND BOILER
Year: 1882

page_text: LETTERS PATENT to Edmund Edwards, of the firm of Edwards and Co:-,
Patent Agents and Engineers, of 40, Southampton Buildings, Chancery Lane,
in the County of Middlesex, for an invention of "AN IMPROVED COMBINED
STEAM ENGINE AND BOILER"-A communication from abroad by H. C.
Hoffmeister, of Meidling, in the Empire of Austria.
PROVISIONAL SPECIFICATION left by the said Edmund Edwards at the
Office of the Commissioners of Patents on the 26th April 1882.
EDMUND EDWARDS, of the firm of Edwards and Co, Patent Agents and
Engineers, of 40, Southampton Buildings, Chancery Lane, in the County of
Middlesex "AN IMPROVED COMBINED STEAM ENGINE AND BOILER" [A com-
munication from abroad by H. C. Hoffmeister of Meidling in the Empire of
Austria.]
This invention relates to an improved motive power steam Engine combined
with a boiler of novel construction and provided with a novel apparatus or devico
for automatically feeding the boiler, a surface condenser of novel method of
construction, and an improved apparatus for automatically regulating the steam
pressure.
The boiler consists essentially of a horizontal flat upper chamber to the lower
flat surface of which are rivetted or otherwise attached the ends of a sufficient
number of curved tubes, which hang down into the fire beneath the boiler their
front ends being attached to the bottom plate as described and descending
vertically for a sufficient distance and then curving back and up until their back
ends are similarly attached to the other end of the plate. The tubes may be
arranged so that some of their number descend to a greater depth than the
remainder.
The plates forming the top and bottom of the flat chamber are rivetted or
otherwise attached sufficiently strongly together, the space between them being
stayed by angle iron and other stays.

page_text: The furnace below the flat chamber described and surrounding the tubes is
preferably of cast iron lined with firebrick, in which coal or other suitable fuel is
burned.
A chimney is provided at one end of the furnace, and at the other end is
arranged an inclined hinged door through which the fuel is supplied, and by which
the supply of air to the furnace is automatically regulated, as required in the
following manner. To the upper plate of the flat chamber described, is bolted or
otherwise fixed a tube having a wide mouthed flange upon which is fixed by means
of a corresponding external flange a corrugated flexible elastic diaphragin preferably
of sufficiently strong thin metal, which will therefore be bent or bulged outward to
an extent varying with the varying pressure of the steam behind it.
This movement of the diaphragm is transmitted to a central pin which presses
upon a lever suspended to a fulcrum above, the lower end of which lever operates
upon the inclined hinged door above described opening it and admitting air to
an extent dependent upon the pressure of the steam against the diaphragın as
described.
Below the fireplace is arranged an ash pit, also closed by a hinged door which
is connected to the inclined hinged fire door just described, by levers, in such
manner that in proportion as the fire door is closed the ash pit door is opened and
vice versa.
Upon the upper surface of the flat generating chamber first described is bolted a
hollow dome or pedestal-preferably-of-cast-iron upon which is fitted or fixed a
a vertical hollow standard carrying the necessary bearings for the fly wheel shaft,
slide bars, and other ordinary parts of a steam Engine the cylinder of which is
bolted by its upper Bange to the top of the dome or pedestal, into which its lower
part descends so as to be surrounded with steam. The hollow standard is provided
with doors or covers by which access is obtained to the guides and other moving
parts of the Engine.
An excentric of the ordinary kind is provided which actuates a distributing
slide valve and also a feed pump fitted with suction and delivery pipes in the
usnal wayand-in-the-immediate-neighbourhood of the Engine and boiler arranged
as described, is fixed a condenser consisting of two concentric sheet metal cylinders
of suitable size having a narrow annular space between them closed at its upper
and lower ends, the two cylinders being arranged in an external vessel supplied
with cold water.
The exhaust steam pipe from the Engine, is conducted to the upper end of this
annular space within which it is immediately condensed, the resulting water being
drawn out from its lower end by the suction pipe of the pump which then delivers
it again into the boiler. The same water, therefore, is used over and over again,
only a small additional quantity being required to compensate for loss by leakage.
The level of the water in the boiler remains constant, and incrustation is
impossible, distilled water only being used. The boiler is supplied in the first
place through a safety valve fixed upon its upper surface. A governor of any of
the ordinary well known kinds is connected to the Engine, and actuates by means
of a connecting rod a regulating valve consisting of a hollow tubular cock turning
in an external socket, both the cock and the socket being provided with a sufficient
number of holes for the passage of the steam, which holes are inade to coincide
more or less as the cock turns by the action of the governor. The lever by which
the cock is thus turned may serve also as a regulating handle for starting or
stopping the Engine or admitting more or less steam, by disengaging a screw by
which it is connected to the governor, and which is adjustable in a curved slot in
the lever or handle.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Edmund Edwards in the Great Seal Patent Office on the
26th October 1882.
'
EDMUND EDWARDS, of the firm of Edwards and Co-Patent Agents and
Engineers, of 40, Southampton Buildings, Chancery Lane, in the County of
Middlesex "AN IMPROVED COMBINED STEAM ENGINE AND BOILER" A coin-
munication from abroad by H. C. Hoffmeister of Meidling in the Empire of
Austria
This invention relatos to an improved motive power steam Engine combined
with a boiler of novel construction and provided with a novel apparatus or device
for automatically feeding the boiler, a surface condenser of novel method of con-
struction, and an improved apparatus for automatically regulating the steam
pressure. The boiler consists essentially of a horizontal flat upper chamber to the
lower flat surface of which are rivetted or otherwise attached the ends of a suflicient
number of curved tubes, which hang down into the fire beneath the boiler their
front ends being attached to the bottom plate and descending vertically for a
sufficient distance and then curving back and up until their back ends are similarly
attached to the other end of the bottom plate. The tubes may be arranged so that
some of their number descend to a greater depth than the remainder. The plates
forming the top and bottom of the flat chamber are rivetted or otherwise attached
sufficiently strongly together, the space between them being stayed by angle iron
and other stays. The furnace below the flat chamber described and surrounding
the tubes is preferably of cast iron lined with firebrick, in which coal or other
suitable fuel is burned.
A chimney is provided at one end of the furnace, and at the other end is
arranged an inclined hinged door through which the fuel is supplied, and by
which the supply of air to the furnace is automatically regulated as required in the
following manner. To the upper plate of the flat chamber described, is bolted or
otherwise fixed a tube or attachment baving a wide mouthed flange upon which
is fixed by means of a corresponding external flange a corrugated flexible elastic
diaphragm preferably of steel or other sufficiently strong thin metal, which will
therefore be bent or bulged outward to an extent varying with the varying pressure
of the steam behind it. This movement of the diaphragm is transmitted to a
central pin which presses upon a lever suspended to a fulcrum above, the lower end
of which lever operates upon the inclined hinged door above described, opening it
and admitting air to an extent dependent upon the pressure of the steam against
the diaphragm as described.
Below the fireplace is arranged an ash pit, also closed by a hinged door which
is connected to the inclined hinged firedoor just described, by levers, in such
manner that in proportion as the firedoor is closed the ashpit door is opened and
vice versa.
Upon the upper surface of the flat generating chamber first described is bolted
a hollow dome or pedestal preferably of cast iron upon which is fitted or fixed a
vertical hollow standard carrying the necessary bearings for the fly wheel shaft,
slide bars, and other ordinary parts of a steam Engine the cylinder of which is
bolted by its upper flange to the top of the dome or pedestal, into which its lower
part descends so as to be surrounded with steam. The hollow standard is provided
with doors or covers by which access is obtained to the guides and other moving
parts of the Engine.
An excentric of the ordinary kind is provided which actuates a distributing
slide valve and also a feed pump fitted with suction and delivering pipes in the

page_text: usual way; and in the immediate neighbourhood of the Engine and boiler arranged
as described, is fixed a condenser consisting of two concentric sheet metal cylinders
of suitable size having a narrow annular space between them closed at its upper
and lower ends, the two cylinders being arranged in an external vessel supplied
with cold water.
The exhaust steam pipe from the Engine is conducted to the upper end of this
annular space within which it is immediately condensed, the resulting water being
withdrawn from its lower end by the suction pipe of the pump which then delivers
it again into the boiler. The same water, therefore, is used over and over again,
only a small additional quantity being required to compensate for loss by
leakage.
The level of the water in the boiler remains constant, and incrustation is impos-
sible, distilled water only being used. The boiler is supplied in the first place
through a safety valve fixed upon its upper surface. A governor of any of the
ordinary well known kinds is connected to the Engine, and actuates by means of
a connecting rod a regulating valve consisting of a hollow tubular cock turning
in an external socket, both the cock and the socket being provided with a sufficient
number of holes for the passage of the steam, which holes are made to coincide
more or less as the cock turns by the action of the governor. The lover by which
the cock is thus turned may serve also as a regulating handle for starting or
stopping the Engine or admitting more or less-steam,-by-disengaging-a-scrow_by_
which it is converted to the Governor, and which is adjustable in a curved slot in
the lever or handle.
The accompanying drawing is in illustration of the invention. Figure 1 repre-
sents a longitudinal section, Figure 2 a cross section, figuro 3 a front view and
figure 4a plan of the entire apparatus. The boiler B belongs to the class of
multitubular inexplosible boilers. The main part of this boiler is flat and is formed
by two plates of strong sheetiron. The furnace A is shewn of cast iron and its
firebox is fitted with a fireclay lining. The tubes & curved in the peculiar form
shewn are secured to the bottom-plate-a-which--is-strengthened_by_the_angle_
irons c, b, b', stayed to the top plate of the boiler. The heating may be effected
by any suitable fuel. The intensity of the combustion is regulated by the door t,
which is adjusted automatically to admit air, as required.
This is operated by the following mechanism. The attachment N fixed to the
generator contains a diaphragm of thin corrugated metal, which will under the
varying pressure of the steam bulge more or less.
This diaphragm acts upon the pin r and the lever 8, the end of which is connected
with the hinged door t turning upon the centre x.
In proportion as this door is opened, the ash door w will be closed by means of
the levers vand z and the tappets y, and z¹.
To the top surface of the boiler B the dome or pedestal D, is bolted and upon
the latter the standard F is fixed. The steam cylinder E is suspended in the dome
and in this way is entirely surrounded by steam.
The standard F is fitted with guides for the cross head c and with two covering
plates and g to allow free access to the moving parts.
4
The excentric G imparts movement both to the distributing slide valve and to
the piston of the feed pump M connected therewith. is the valve box of the
feed pump, i the suction pipe and k the delivery pipe. The steam escaping from
the cylinder E enters the condenser T through the pipe H. Two concentric
cylinders K and L of sheet metal form this condenser which is placed in a 5
refrigerating vessel P. The steam entering through the pipe H will in consequence
of the very narrow space between the cylinders K and L immediately be condensed
and the water thus produced is continually withdrawn by the feed pump M
through the pipe i. The same quantity of water will therefore after being con-
densed be used repeatedly for producing the steam in the boiler B and only a very 5
small additional quantity will be required in the boiler to make up for the
unavoidable loss by leakage or other cause.

page_text: The level of the water within the boiler remains necessarily always constant,
and incrustation is rendered impossible because only distilled water is employed.
The original water is filled into the boiler through the safety valve o'. The
governor operates by means of the rod m¹ the attachment screw o and the lever p,
the hollow cock m turning in the socket 7. Both the cock m and socket Z are
provided with a number of holes, which under the influence of the governor cover
each other more or less and so admit more or less steam from the dome D to the
slide valve box.
By removing the attachment screw o, the lever p may be turned by hand for
the purpose of admitting more or less steam or for cutting it off entirely and so
stopping the Engine.
Having now described the invention and the manner in which it is to be
performed, I claim :-
1, The novel method of constructing the boiler B, having curved descending
tubes d, substantially as described and shewn.
2. The combination of the corrugated plate, levers, and hinged doors, for the
purpose of automatically regulating the combustion of the fuel, substantially as
described and shewn.
3. The throttle valve consisting of a hollow cock turning in a socket, both being
provided with holes, and the cock being operated by a governor, substantially as
and for the purpose described and shewn.
4. The general method of arrangement and combination of the several parts of
the combined steam Engine and boiler, substantially as described and shewn.
In witness whereof, I the said Edmund Edwards have hereunto set my hand
and seal this 24th day of October in the year of our Lord 1882.
EDMUND TWADDO
101