IMPROVEMENTS IN ROTATORY ENGINES
Year: 1853

page_text: LETTERS PATENT to Jolin Yule, of 145, North Wellington Street,
Glasgow, for the Invention of "IMPROVEMENTS IN ROTATORY
ENGINES."
"
Sealed the 8th September 1853, and dated the 14th July 1858.
PROVISIONAL SPECIFICATION left by the said John Yule at the
Office of the Commissioners of Patents, with his Petition, on the
14th July 1858.
I, JOHN YULE, of 145, North Wellington Street, Glasgow, do
liereby declare that the nature of my Invention for "IMPROVEMENTS IN
ROTATORY ENGINES" to be as follows:-
This Invention consists of several improvements in rotatory engines,
wherein a cylinder or piston works excentrically within a cylindrical
chamber, where a sliding stop is employed; and my improvements are,
First, the making of guides or grooves in the covers to guide the
slide or stop into and.from the cylinder:
Second, the giving motion to the slide or stop by means of a shaft
receiving motion from the main shaft:
Third, the constructing the outer and inner cylinders in halves to
facilitate the removal and getting at parts for repairs.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said John Yule in the Great Scal Patent Office, on
the 13th January 1854.
"
TO ALL TO WHOM THESE PRESENTS SHALL COME, I,
JOHN YULE, of 145, North Wellington Street, Glasgow, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Fourteenth day of July, in the year
of our Lord One thousand eight hundred and fifty-three, in the seven-
teenth year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said John Yule,. Her special licence that
I, the said John Yule, my executors, administrators, and assigns, or
such others as I, the said John Yule, 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 ROTATORY
ENGINES," upon the condition (amongst others) that I, the said John
Yule, by an instrument in writing under my hand and seal, 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 Yule, 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 consists of several improvements in rotatory engines,
wherein a cylinder or piston works excentrically within a cylindrical
chamber, where a sliding stop is employed; and my improvements are,
First, the making of guides or grooves in the covers to guide the slide
or stop into and from the cylinder: Second, the giving motion to the
slide or stop by means of a shaft receiving motion from tlie main shaft:
Third, the constructing the outer and inner cylinders in halves to
facilitate the removal and getting at parts for repairs.

page_text: Having thus stated the nature of my Invention;I will proceed. to>
describe the Drawings hereunto annexed, remarking that the same!
letters in each--Figure représent the same parts
Figure 1, is a pair of engines. A, engine (a sectional'elevation)";
Bran elevation of same; y, y, main shaft; a,inner. excentric.cylinder*,
or piston,-6, blades; c, c, crank or excentric shaft for driving blades;
did, connecting rods; e e, standards for support of 'shaft.fixed .onr
cylinder covers; ff, spur wheels by which crank shaft is driven.;-;g;>
flange on lower side of outer cylinder for bolting it together in two
halves;H, outer cylinder; k, k, flanges cast on cylinder covers for!
standards; n, nozzle casing; o, steam pipe branch;m, exhaust port';
D, D, cylinder covers; E, sole plate.
Figure 2, plan of Figure 1. A, engine; B, B, nozzles cast on outer
cylinder; D, D, cylinder, covers; Y, main shaft; h, opening in top of
cylinder for blade; 1), grooves in cylinder covers for guiding blade;
k, k, flanges cast on cylinder covers for standards; 1, 1, steam ports;
m, m, exhaust ports; B, engine; C, crank shaft; d, connecting rod;
9, flanges for bolting cylinder together; l, steam port; p', steam valve;
1, m, exhaust port; p³, steam valve.
i
Figure 4, end elevation of Figures 1, 2, and 3.
"The action, by those at all acquainted with steam power, will at once
be understood from the Drawings; but to those who are not, it may be
easily explained by referring to section of engine, Figure 3. There the
piston, excentric or inner cylinder from which the power is obtained, is
full down, or at its greatest power. The blade or steam stop b, is also
down, and pressing upon the inner cylinder, so as to make a steam
tight division betwixt the one side of the cylinder and the other. The
valve p', is drawn to allow the steam to get into the cylinder by the
steam port . The steam being admitted exerts its power upon the inner
cylinder. Y, being the main shaft or centre of motion, and the lower
side from centre being much greater than the upper side, the con-
sequence is, that the inner cylinder is forced round to the top, the
power at that point having gradually decreased to nothing; but the
impetus given carries it past, and the power again increases gradually
until it arrives at the bottom or greatest power; the cranks or excentrics

page_text: on the shaft C; C,, having exactly the same throw as the inner cylinder,
has during the entire revolution kept the lower edge of the blade.
touching the inner cylinder with exactly the same pressure; but to:
prevent friction from any undue pressure which might occur from
jarring or otherwise, a spring packing capable of yielding about one
eighth of an inch is introduced into the lower edge of the blade; by
merely shifting the valves p, p, to opposite positions the motion of the.
engine is reversed.
I would remark that other forms, guides, and grooves may be used
than those shown and described, and the details may be. otherwise
varied, without departing from my Invention.
In witness whereof I, the said John Yule, have hereunto set my
hand and seal, this Eleventh day of January, in the year of our
Lord One thousand eight hundred and fifty-four.
Witness,
ALEXANDER BARR,
of No. 59, Renfield Street,
Glasgow.
JOHN YULE.
(L. S.)