IMPROVEMENTS IN STEAM ENGINES, APPLI- CABLE ALSO TO PUMPS AND GAS EXHAUSTERS
Year: 1864

page_text: LETTERS PATENT to John Huggett, of Eastbourne, in the County of
Sussex, for the Invention of "IMPROVEMENTS IN STEAM ENGINES, APPLI-
CABLE ALSO TO PUMPS AND GAS EXHAUSTERS."
Sealed the 25th November 1864, and dated the 30th May 1864.
PROVISIONAL SPECIFICATION left by the said John Huggett at the
Office of the Commissioners of Patents, with his Petition, on the 30th
May 1864.
I, JOHN HUGGETT, of Eastbourne, in the County of Sussex, do hereby
declare the nature of the said Invention for "IMPROVEMENTS IN STEAM ENGINES,
APPLICABLE ALSO TO PUMPS AND GAS EXHAUSTERS," to be as follows:-
My Invention consists in constructing a cylinder in the form represented in
the accompanying sectional view, in fitting inside it a solid core and piston
traversing a central shaft, and in providing inlet and outlet passages, all as
more fully explained with reference to the Drawing. The engine is of the
class known as rotary engines.
A is a piston passing through the central shaft B; C is a solid core, and D
is the cylinder; E is an inlet, and F an outlet passage. The shaft B works
through stuffing boxes in the centre of the cylinder heads. The inlet and
outlet passages may be in the same or opposite heads of the cylinder. The
fluid, say steam, entering drives the piston round the circular part of the

page_text: cylinder, and on coming in contact with the excentric part thereof the piston
moves through the shaft, both ends remaining constantly in contact with the
interior surface of the cylinder. The steam is only shut off by the piston itself
while passing the inlet.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said John Huggett in the Great Seal Patent Office on the
30th November 1864.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOHN
HUGGETT, of Eastbourne, in the County of Sussex, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Thirtieth day of May, in the year of our Lord
One thousand eight hundred and sixty-four, in the twenty-seventh year of
Her reign, did, for Herself, Her heirs and successors, give and grant unto me,
the said John Huggett, Her special licence that I, the said John Huggett,
my executors, administrators, and assigns, or such others as I, the said John
Huggett, 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 ENGINES, APPLICABLE ALSO TO PUMPS AND GAS EXHAUSTERS," upon the
condition (amongst others) that I, the said John Huggett, my executors or
administrators, by an instrument in writing under my, or their, or one of
their hands and seals, 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 John Huggett, do hereby declare the
nature of my said Invention, and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement thereof, reference being had to the Drawings hereunto annexed,
that is to say
My Invention consists in constructing a cylinder in the form represented in
the accompanying Drawings, in fitting inside it a solid core and piston
traversing a central shaft, and in providing inlet and outlet. passages, all as

page_text: more fully explained with reference to the Drawings. The engine is of the
class known as rotary engines.
A is the cylinder, and B the piston, free to revolve therein; C is a solid
block fixed to or forming part of the cylinder A, this block is formed with
gradients c, c; D is the central shaft through which the piston B passes;
D', D', are segments forming a solid core fixed to the shaft D; E is the inlet
and F the outlet port or passage. The fluid, say steam, entering the cylinder
at the port E drives the piston towards the port F; the piston here comes in
contact with the gradient c of the block C, which causes it to slide in the
shaft D, the steam then immediately acts on the opposite end of the piston and
drives it again towards the port F. The segments D' need not form a steam
joint against the block C, nor need the piston B form a steam joint through
the shaft D or segments D', but the outer edges of the piston B form a steam
joint the whole of its circumference. The engine can be reversed by admitting
the steam at the opposite side. By connecting pipes to the inlet and outlet
ports the engine may be used as a pump and as a gas exhauster, the suction
pipe being in communication with the liquid or fluid to be acted on.
And having now described the nature of my said Invention, and in what
manner the same is to be performed, I declare that I claim, constructing
steam engines, pumps, and gas exhausters, substantially as herein-before
described and represented in the accompanying Drawings.
In witness whereof, I, the said John Huggett, have hereunto set my
hand and seal, this Twenty-ninth day of November, One thousand
eight hundred and sixty-four.
JOHN HUGGETT. (L.S.)