AN IMPROVED ROTARY STEAM ENGINE
Year: 1869

page_text: LETTERS PATENT to George White, of 68, Queen Street, Cheapside,
in the City of London, Patent Agent, for the Invention of "AN
IMPROVED ROTARY STEAM ENGINE."-A communication from abroad by
Mr. William Dorning, of Polgardi, in the Empire of Austria,
Engineer.
Sealed the 22nd December 1869, and dated the 2nd July 1869.
PROVISIONAL SPECIFICATION left by the said George White at the
Office of the Commissioners of Patents, with his Petition, on the
2nd July 1869..
I, GEORGE WHITE, of 68, Queen Street, Cheapside, in the City of
London, Patent Agent, do hereby declare the nature of the said In-
vention for "AN IMPROVED ROTARY STEAM ENGINE," a communication to me
from abroad by Mr. William Dorning, of Polgardi, in the Empire of
Austria, Engineer, to be as follows:-
The Invention relates to an improved rotary steam engine, of which
Fig. 1 of the annexed Drawing shows a front elevation view; Fig. 2, a
vertical sectional view over the line X, X', of Fig. 3; and Fig. 3, a plan
view of the principal parts (some of which are shown partly in sectional
view) over the line Y, Y', of Fig. 2.

page_text: The engine consists of a cast-iron jacket A provided at both ends
with hermetically closing lids A' and A, and in the interior of which
jacket are situated two rollers B and B' revolving by means of their
arbors 6 and ', on which latter are respectively fitted the tooth wheels
C and C in gear with each other, whilst the arbor b is further provided
with a fly wheel V and fast and loose pullies or other means for trans-
mitting the revolving motion of the said arbor b to any machinery
intended to be driven by the engine. The roller B₁ is provided with a
longitudinal circular groove D', in which takes at the required moments
a corresponding longitudinal diaphragm or eave D, forming projection
on the roller B, and which cave D is to act as a piston, the two rollers
B and B revolving in close contact with each other. In the roller B
are provided two circular passages I and J separated by a division plato
K; these passages form circular openings at the ends of the roller B,
whilst the periphery of this latter the passage I opens at i on one
side of the eave D, whereas the other passage J opens at j on the other
side of the said eave D. The steam entering by the pipe F" reaches a
steam box F, where by means of a slide valve f worked by a lever G
the same is conducted by the pipes E and E' and the port hole d and
d either in the passage I or in that J, according to the direction in
which the rollers B and B are to revolve. H is a passage provided in
the interior of the jacket A, which passage by means of the steam
boxes M and N and the slide valves m and n may be connected either
with the passage I by means of the port holes h1, h2, and h, or with the
passage J by means of the port holes h', hs, and h', and consequently
in both cases with the steam exit pipe Z. S is a governor driven by
the usual means by the main arbor 6 and working the throttle valve F.
In Fig. 2 of the Drawing the various parts are shown in the position in
which the steam causes the rollers B and B to revolve in the direction
of the arrows R and R', and at the moment in which the port hole d
being shut prevents the steam from entering through the passage I,
and act behind the eave D, which latter and consequently the rollers B
and B is then merely driven by the momentum of the fly wheel V till
the eave D reaches the position shown by the red lines in Fig. 2, when
the port hole d being open allows the steam to enter behind the eave D,
and thus causes this latter and the roller B of which the eave forms part
to continue its revolution.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said George White in the Great Seal Patent Office
on the 1st January 1870.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, GEORGE
WHITE, of 68, Queen Street, Cheapside, in the City of London, Patent
Agent, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Second day of August, in the year of
our Lord One thousand eight hundred and sixty-nine, in the thirty-third
year of Her reign, did, for Herself, Her heirs and successors, give and
grant unto me, the said George White, Her special licence that I, the
said George White, my executors, administrators, and assigns, or such
others as I, the said George White, 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 "AN IMPROVED ROTARY STEAM ENGINE," a com-
munication to me from abroad by Mr. William Dorning, of Polgardi,
in the Empire of Austria, Engineer, upon the condition (amongst
others) that I, the said George White, my executors or adminis-
trators, 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 George White, 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 :-
The Invention relates to an improved rotary steam engine, of which
Fig. 1 of the annexed Drawings represents a front elevation view; Fig. 2,
a vertical sectional view taken over the line X, X', of Fig. 3; and Fig. 3,
a plan view of the principal parts (some of which are shown partly in
sectional view) over the line Y, Y', of Fig. 2. In these three Figs. some

page_text: parts are shown partly cut off, and in all of them the same letters of
reference relate to corresponding parts.
The engine consists of a cast or wrought iron jacket or outer body A
provided at each of its two ends with lids A & A hermetically fixed
thereto by screw bolts or other suitable means, and in the interior of
which jacket or body is situated two rollers B & B of the same length
and respectively fixed on arbors 6 & 6' revolving in suitable bearings,
on which arbors & are fixed the tooth wheels C & C in gear with
each other, whilst the arbor b is further provided with a fly wheel V
and fast and loose pullies or other suitable means for transmitting the
revolving motion of the said arbor 6 to any machinery intended to be
driven by the engine. The roller B' is provided over its entire length
with a longitudinal circular groove D¹ in which takes at the required
moments a corresponding longitudinal diaphragm D or eave extending
over the entire length of and forming projection on the roller B,
and which eave or projecting diaphragm D is to act as a piston, the
two rollers B & B revolving tangentially in close contact with each
other. In the roller B are provided at opposite ends two circular
passages I & J, separated from each other by a partition or division
plate K; these passages form circular openings at the ends of the
roller B, whilst at the periphery of this latter the passage I opens at i
on one side of the eave or diaphragm D, whereas the other passage J
opens at at the other side of the said eave D. The steam is conducted
from any suitable steam boiler by the pipe F into a steam box F,
whence by means of a slide valve worked by a rod f' and lever G the
same is conducted by the pipes E or E' and the port holes d & d either
into the passage I or in that J according to the direction in which the
rollers B & B are to revolve. H is a passage provided in the interior
of the passage A, which passage by means of the steam boxes M & N and
the slide valves m & n may by means of the rod T connected to the lever G
be put in communication either with the passage I by means of the
port holes h³, h, & h, or with the passage J by means of the port holes
', hs, & h, and consequently in both cases with the steam oxit pipe Z.
S is a governor driven in the usual manner by the main arbor b and
strap S' and actuating the throttle valve F by means of the bell-crank
lever U and connecting rod U¹. In Fig. 2 the various parts are
shown in the position in which the steam causes the rollers B&B' to
revolve in the direction of the arrows R & R', and at the moment in

page_text: which the pipe E and port hole d being shut the steam is prevented
from entering through the passage I and act behind the cave D, which
latter, and consequently the rollers B & B, are in that moment nearly
driven by the momentum of the fly wheel V till the cave D reaches the
position shown in red lines in Fig. 2, in which position the pipe E and
port hole d being open allows the steam to enter behind the eave D,
and thereby cause this latter and consequently the roller B of which the
eave forms part of continuing its revolution.
Having now described and particularly ascertained the nature of
the Invention, and the manner in which the same is put into operation,
I declare that what I consider to be novel and original, and therefore
claim as the Invention secured to me by the herein-before in part
recited Letters Patent is, the general arrangement and combination of
parts of the rotary steam engine above described and illustrated in the
Drawings.
In witness whereof, I, the said George White, have hereunto set
my hand and seal, this First day of January, in the year of our
Lord One thousand eight hundred and seventy.
GEO. WHITE. (L.S.)