IMPROVEMENTS IN STEAM AND AIR ENGINES."
Year: 1871

page_text: LETTERS PATENT to George Warsop, of No. 9, Burton Street, Notting-
ham, for the Invention of "IMPROVEMENTS IN STEAM AND AIR ENGINES."
PROVISIONAL SPECIFICATION left by the said George Warsop at the
Office of the Commissioners of Patents, with his Petition, on the
20th January 1871.
I, GEORGE WARSOP, of No. 9, Burton Street, Nottingham, do hereby.
declare the nature of the said Invention for "IMPROVEMENTS IN STEAM AND
AIR ENGINES," to be as follows:-
This Invention has for its object improvements in steam and air
engines. When engines working with a mixture of steam and air are
provided with a condenser in which the pressure is reduced below that of
the atmosphere I arrange the pump or air forcing apparatus which
compresses the air for the use of the engine to draw air from the
condenser and so aid in reducing the pressure therein. Near the end
of the stroke of the pump or air forcing apparatus a further and full
supply of air is taken from the atmosphere, the piston then passing over

page_text: an air port by which the air is admitted through a passage furnished
with a valve, or other similar arrangement. may be made for the free
admission of air towards the end of the stroke.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said George Warsop in the Great Seal Patent Office
on the 20th July 1871.
•
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, GEORGE
WARSOP, of No. 9, Burton Street, Nottingham, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twentieth day of January, in the year
of our Lord One thousand eight hundred and seventy-one, in the thirty-
fourth year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said George Warsop, Her special license
that I, the said George Warsop, my executors, administrators, and
assigns, or such others as I, the said George Warsop, my executors,
administrators, and assigns, should at any time agree with, and no
others, from time to time and at all times thereafter during the term
therein expressed, should and lawfully might make, use, exercise, and
vend, within the United Kingdom of Great Britain and Ireland, the
Channel Islands, and Isle of Man, an Invention for "IMPROVEMENTS IN
STEAM AND AIR ENGINES," upon the condition (amongst others) that I, the
said George Warsop, my executors or administrators, by an instrument
in writing under my, or their, or one of their hands and scals, should
particularly describe and ascertain the nature of the said Invention,
and in what manner the same was to be performed, and cause the
same to be filed in the Great Seal Patent Office within six calendar
months next and immediately after the date of the said Letters Patent.
○ NOW KNOW YE, that I, the said George Warsop, do hereby declare
the nature of the said Invention, and in what manner the same is to
be performed, to be particularly described and ascertained in and by
the following statement thereof, that is to say :-
This Invention has for its object improvements in steam and air
engines. When engines working with a mixture of steam and air are

page_text: provided with a condenser in which the pressure is reduced. below that
of the atmosphere I arrange the pump, or air forcing apparatus which
compresses the air for the use of the engine to draw air from the
condenser and so aid in reducing the pressure therein. Near the end
of the stroke of the pump or air forcing apparatus a further and full
supply of air is taken from the atmosphere; the piston then passing over
an air port by which the air is admitted through a passage furnished
with a valve, or other similar arrangement may be made for the free
admission of air towards the end of the stroke.
in section of a condenser with an air pump so arranged as both to draw
air from the condenser and also to force air into the boiler.
a, a, is a portion of a surface condenser with its tubes a¹, a¹; b is the
air pump cylinder with its piston c and piston rod c¹; d is the inlet
passage to the pump from the condenser, and d¹ is a valve in this
passage, it is only allowed to open a short distance so that it may shut
rapidly; e is the passage from the air pump to the boiler, it is fitted with
a ball valve which also is not allowed to move far from its seat; 6' is a
hole or port in the side of the cylinder 6 which is uncovered just as the
piston reaches the end of its stroke, it communicates with a passage
which is open to the atmosphere and fitted with a valve similar in all
respects to the valve d³, thus it will be seen that as the air pump piston
moves away from the bottom of its cylinder it draws air from the
condenser, and this it does until it passes the port or passage b¹. A
further supply of air then immediately rushes into the cylinder and
fully supplies it. Then on the return stroke of the piston the air
becomes compressed and forced into the boiler.
Having thus described the nature of my said Invention, and the
manner of performing the same, I would have it understood that what
I claim is, the so arranging the air pump of steam and air engines that

page_text: it may serve both to draw air from the condenser and force air into the
boiler substantially as described.
In witness whereof, I, the said George Warsop, have hereunto
set my hand and seal, this Fifteenth day of July, in the year of
our Lord One thousand eight hundred and seventy-one.