Year: 1886

page_text: We MATTHEW PIERS WATT BOULTON of Tew Park in the County of Oxford
Gentleman and EDWARD PERRETT of Victoria Chambers in the City of West-
minster Civil Engineer do hereby declare the nature of this invention to be as
follows:
This invention relates to an engine worked partly by steam and partly by gas
or inflammable vapour.
In what follows we shall use the word gas it being understood that this word
includes inflammable elastic fluid of all kinds.
The steam employed in the engine is generated in a boiler and works on one side
of a piston in a cylinder while the combustion of the gas operates on the other
side of the piston-Thus the heat imparted by the combustion of the gas to the
sides of the cylinder serves to superheat the steam when this in its expansion
passed over the heated sides, the sides being thus kept cool while the heat abstracted
from them is utilized.
The steam and gas after issue from the cylinder in which they have acted as
above described may be treated in various ways. They may be discharged as
exhaust or they may proceed to act in a further cylinder-In the latter case they
may act separately in this cylinder-that is to say on separate sides of its piston―
or they may be discharged from the first cylinder into a reservoir where they mix
together-this mixed fluid acting in the second cylinder-Or otherwise the exhaust
fluid from the gas side of the first cylinder may be discharged as waste while the
exhaust steam from the first cylinder supplies a second cylinder-The proportions
of steam and gas employed can be determined as desired by making the first
cylinder differential. Also the second cylinder can be made differential for adjusting
as desired the expansion in this cylinder when the fluids are separately expanded.
For that portion of the engine which acts as a gas engine any suitable known
form of gas engine may be employed.
If the gas is produced by a gas producer such as the Dowson gas producer the
gas produced by this apparatus may be employed partly to heat the boiler in which
the steam is generated and partly to perform work in the cylinder of the engine.
Dated this 23rd day of Fahumanu 1000
CARPMAEL & Co.,
Agents for the Applicants."

page_text: We, MATTHEW PIERS WATT BOULTON of Tew Park in the County of Oxford
Gentleman and EDWARD PERRETT of Victoria Chambers in the City of West-
minster Civil Engineer do hereby declare the nature of this invention and in what
manner the same is to be performed to be particularly described and ascertained
in and by the following statement :—
This Invention relates to an engine worked partly by steam and partly by gas
or inflammable vapour.
In what follows we shall use the word gas it being understood that this word
includes inflammable elastic fluid of all kinds.
The steam employed in the engine is generated in a boiler and works on one side
of a piston in a cylinder while the combustion of the gas operates on the other side
of the piston. Thus the heat imparted by the combustion of the gas to the sides
of the cylinder serves to superheat the steam when this in its expansion passes
over the heated sides, the sides being thus kept cool while the heat abstracted from
them is utilized.
The steam and gas after issue from the cylinder in which they have acted as
above described may be treated in various ways. They may be discharged as
exhaust or they may proceed to act in a further cylinder. In the latter case they
may act separately in this cylinder-that is to say on separate sides of its piston-
or they may be discharged from the first cylinder into a reservoir where they mix
together-this mixed fluid acting in the second cylinder. Or otherwise the exhaust
fluid from the gas side of the first cylinder may be discharged as waste while the
exhaust steam from the first cylinder supplies a second cylinder. The proportions
of steam and gas employed can be determined as desired by making the first
cylinder differential. Also the second cylinder can be made differential for adjusting
as desired the expansion in this cylinder when the fluids are separately expanded.
For that portion of the engine which acts as a gas engine any suitable known
form of gas engine may be employed.
If the gas is produced by a gas producer such as the Dowson gas producer the
gas produced by this apparatus may be employed partly to heat the boiler in which
the steam is generated and partly to perform work in the cylinder of the engine.
In order that our said invention may be fully understood and readily carried
into effect we will proceed to describe the drawings hereunto annexed.
DESCRIPTION OF THE DRAWINGS.
Figure 1 shows an engine illustrating our invention in its simpler form; some of
the parts are seen in section and the framing is for the most part omitted. The
engine is provided with a cranked shaft carrying a fly wheel; the cranks are
connected in the usual way to pistons working in cylinders.
A is a pump drawing in air and gas past the inlet valves marked a¹ a¹
respectively; then compressing the same and discharging the mixture by the
ika lawan nont of the cylinder B. At a suitable time the valve b

page_text: products are discharged into the atmosphere in the usual manner by the opening
of the valve b by an eccentric on the main shaft. The upper part of the piston
may as here shown be provided with a trunk. In the space above the piston steam
from a boiler is introduced through a valve b when at the proper time the eccentric
on the shaft opens it.
The steam after performing work is exhausted into the atmosphere by the
opening of the valve b³. Or the steam may be passed into a condenser in the usual
manner. The steam in its passage to the valve chest is (or may be) passed through
the space be provided round the lower part of the cylinder and the admission
apparatus.
Figure 2 shews an engine similar to the above but with an additional cylinder
for expanding the gaseous products and the steam. A is the pump and B the first
cylinder as before, the exhaust gases from the underside of the piston in B are
passed into the larger cylinder C where they perform work on the underside of the
piston before being discharged into the atmosphere by the opening of the valve c.
The steam from the upper side of the piston in B is discharged into a space above
the piston in C where it further expands the exhaust being discharged by the
opening of the valve c¹. The valves c and c¹ are controlled by an eccentric on the
shaft. The steam may be taken to a condenser if required.
Figure 3 shows an engine in which the gaseous products and the steam after
performing work in the cylinder B are allowed to mingle and then to expand doing
further work in the cylinder C. In this figure A is the pump and B is the cylinder
as before. The exhausts from this cylinder enter the chamber D. The additional
cylinder C is supplied from the chamber D by a slide valve worked by an eccentric
and the same valve controls the exhaust or escape of the mixed steam and gases
from the cylinder C into the atmosphere. The arrangement of the valves and
other parts admits of considerable variation without departing from our invention.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what
we claim is:—
1. A combined steam and gas engine in which gas is supplied and burnt on one
side of a piston in a cylinder and steam from a boiler is supplied on the other side.
2. A combined steam and gas engine in which gas is supplied and burnt on
one side of a piston in a cylinder and steam from a boiler is supplied on the other
side and there operates on a reduced area in consequence of the piston being
provided with a trunk.
3. A combined steam and gas engine in which gas is supplied and burnt on one
side of a piston in a cylinder and steam from a boiler is supplied on the other side;
and in which the products of combustion and the steam afterwards pass into
another cylinder and there do further work on a piston the one on one side and
the other on the other side thereof.
4. A combined steam and gas engine in which gas is supplied and burnt on one
side of a piston in a cylinder and steam from a boiler is supplied on the other side;
and in which the products of combustion and the steam pass from the cylinder
into a chamber and mix and afterwards do further work on a piston in another
cylinder.
5. Combined steam and gas engines substantially as described.