IMPROVE- MENTS IN ROTARY ENGINES, PUMPS, OR METERS
Year: 1875

page_text: LETTERS PATENT to Walter Eccleston Bartrum, of Glen Mona,
Streatham, in the County of Surrey, for the Invention of "IMPROVE-
MENTS IN ROTARY ENGINES, PUMPS, OR METERS."-Partly a communi-
cation from abroad by Henry Coke Powell, residing at Limogne,
France.
PROVISIONAL SPECIFICATION left by the said Walter Eccleston
Bartrum at the Office of the Commissioners of Patents, with his
Petition, on the 22nd September 1875.
I, WALTER ECCLESTON BARTRUM, of Glen Mona, Streatham, in the
County of Surrey, do hereby declare the nature of the said Inven-
tion for "IMPROVEMENTS IN ROTARY ENGINES, PUMPS, OR METERS," to be as
follows:-
This Invention relates to rotary apparatus that may be employed as
an engine worked by steam of other fluid under pressure, or as a pump
for raising or forcing fluids, or as a liquid or fluid meter.

page_text: This apparatus consists of a cylinder, in the axis of which is mounted
a shaft having on it an eccentric or crank. On this eccentric or crank
is fitted a strap of such thickness that its exterior is in contact with
the interior surface of the cylinder. From one side of the said strap an
arm or slab projects through bushes mounted in the side of the cylinder
through which bushes it can freely slide, while these bushes themselves
can partly rotate. A port or passage is formed through the side of the
cylinder near the said bushes on the one side thereof, and another part is
likewise provided on their other side; steam or other fluid under pressure
being admitted by the one of these ports, while an escape is provided
at the other port, the excess of pressure on the one side of the eccentric
or crank causes it to revolve and the shaft to rotate therewith, the
apparatus thus forming a rotary engine or fluid meter. Or if the
shaft be caused to rotate by power applied thereto, fluid will be drawn
in at one of the ports and will be forced out at the other; the apparatus
thus constituting a rotary pump or instrument for raising or forcing
fluids.
Either of the ports mentioned above instead of being formed in the
side of the cylinder might be formed as a passage in the slab arm of the
eccentric strap, opening at its outer end into a chamber connected with
cither the supply or the discharge, and at its inner end opening by a
lateral aperture into the cylinder.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Walter Eccleston Bartrum in the Great Seal Patent
Office on the 17th March 1876.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, WALTER
ECCLESTON BARTRUM, of Glen Mona, Streatham, in the County of Surrcy,
send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-second day of September, in a
the year of our Lord One thousand eight hundred and seventy-five, in
the thirty-ninth year of Her reign, did, for Herself, Her heirs and suc-
cessors, give and grant unto me, the said Walter Eccleston Bartrum,
Her special license, that I, the said Walter Eccleston Bartrum, my

page_text: executors, administrators, and assigns, or such others as I, the said
Walter Eccleston Bartrum, 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 ROTARY ENGINES, PUMPS, or
METERS," (the result partly of a communication made to me from
abroad by Henry Coke Powell, residing at Limogne, France, and partly
of an Invention made by myself) upon the condition (amongst others)
that I, the said Walter Eccleston Bartrum, 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 naturo
of the said Invention, and in what manner the same was to be per-
formed, 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 Walter Eccleston Bartrum, 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, reference being had to the
accompanying Sheet of Drawings and to the figures and letters marked
thereon, that is to say :—
.
This Invention relates to rotary apparatus that may be employed as
an engine worked by steam or other fluid under pressure, or as a pump
for raising or forcing fluids, or as a liquid or fluid meter.
This apparatus consists of a cylinder in the axis of which is mounted
a shaft having on it an eccentric or crank. On this eccentric or crank
is fitted a strap of such thickness that its exterior is in contact with
the interior surface of the cylinder. From one side of the said strap an
arm or slab projects through bushes mounted in the side of the cylinder
through which bushes it can freely slide, while these bushes themselves
can partly rotate. A port or passage is formed through the side of the
cylinder near the said bushes on the one side thereof, and another port is
likewise provided on their other side; steam or other fluid under pressure
being admitted by the one of these ports, while an escape is provided at
the other port, the excess of pressure on the one side of the eccentric
or crank causes it to revolve and the shaft to rotate therewith, the

page_text: Or if the
shaft be caused to rotate by power applied thereto fluid will be drawn
in at one of the ports and will be forced out at the other; the apparatus
thus constituting a rotary pump or instrument for raising or forcing
apparatus thus forming a rotary engine or fluid meter.
fluids.
Either of the ports mentioned above instead of being formed in the
side of the cylinder might be formed as a passage in the slab arm of the
eccentric strap, opening at its outer end into a chamber connected with
either the supply or the discharge, and at its inner end opening by a
lateral aperture into the cylinder.
Fig. 1 represents a transverse section, and Fig. 2 a sectional plan of
an engine constructed according to this Invention; Figs. 3 and 4
shewing on a smaller scale two different positions of the moving parts
to illustrate the action of the apparatus.
A is a cylinder, in the axis of which is mounted a shaft B that
passes through a stuffing box in one of the end covers of the cylinder, or
it may pass through stuffing boxes in both covers. On the shaft B is
fixed an eccentric sheave C, the eccentricity of which may be some-
what varied by means of a setting screw c provided with lock nuts to
prevent it from turning after it has been set. The eccentric sheave C
is embraced by a band D which extends the whole length of the
cylinder A, and which is made of such thickness as to fit exactly
between the outer circumference of the sheave C and the inner surface
of the cylinder A. When slackness results from wear, a cap a on the
side of the cylinder, and a cap c¹ on the band can be removed, and by
turning the screw c the eccentricity of the sheave C can be somewhat
increased so as to cause the band D to bear against the inner surface of
the cylinder A; also a sliding face E is provided at either end of the
cylinder A, which face can be set up by screws e to take up endways
slack and prevent leakage. From the band D a slab or arm F extends
and is guided through a cylindrical rocking joint G arranged in a cavity
at one side of the cylinder, the slab F being capable of sliding longitu-
dinally through the joint, whilst the joint itself is capable of partially
rotating in its seat. In order to ensure a good fit of the cylindrical joint
to its seating and to the slab F, and to prevent leakage of fluid through
it, one side of the joint is made with a sliding face piece g pushed by a
spring or by the pressure of fluid in the cavity at the mouth of
which the joint G is fitted. At each end of the joint G there are also

page_text: sliding face pieces g', g², set forward by setting screws or springs, or the
one by a setting screw and the other by a volute spring g³, as shewn
in Fig. 2, to keep the ends of the joint G and the edges of the slab F
tight. A portf is formed in the slab F communicating at its end with
the cavity H, and having a side opening f¹; there are also formed by
grooves or chases h, h³, on the one side of the joint G and its seating a
passage or passages by which in certain positions of the moving parts,
as shewn in Fig. 4, fluid can pass from H to A, and in other positions,
as in Figs. 1 and 3, its passage is stopped. The cavity H is supplied
with steam or other fluid under pressure by a pipe I, and at the side of
the cylinder A, close to the joint G, is an outlet passage O communi-
cating with a discharge pipe K.
The apparatus operates as follows:-The eccentric C being in the
position shewn in Fig. 4, the steam or working fluid flows from H by the
passages h¹, h, into the cylinder A and pressing on the one side of the
eccentric band D causes the eccentric and shaft B to revolve towards
the position shewn in Fig. 1, when the passages h³, h, are cut off, but a
fresh passage for the fluid is presented by the exposure of the side
opening of the port f. The rotation of the shaft and eccentric con-
tinues till they attain the position shewn in Fig. 3, by which time the
supply by has been cut off, but the movement is continued by the
expansion of the fluid already supplied to the one side of the cylinder A
until the discharge outlet O is exposed, whereupon the fluid escapes
by the discharge pipe K after having done its work in the cylinder,
and the like action is repeated in every revolution. The shaft B may
be provided with a fly wheel to carry the eccentric and moving parts
over the dead centre which occurs when the eccentric stands in the
position opposite to that shewn in Fig. 1. Or two engines such as I
have described may be arranged to act on the same shaft, their eccentrics
being set opposite to one another, or nearly so.
I have described the operation of the apparatus as an engine, by
which the pressure of a fluid is made to give rotary motion to a shaft,
either for the production of motive power or to act as a meter for the
measurement of the fluid passing through a cylinder of known capacity.
It may be readily understood however, that by giving from an extra-
neous source rotary motion to the shaft B the apparatus could be made
to act as a pump for raising or forcing fluids, the pipes I and K serving
either for inlet or for outlet respectively, according to the direction in in

page_text: which the shaft B may be caused to revolve. Instead of the eccentric
sheave C fixed on the shaft B a crank forming part of the shaft itself
might be employed, the band D being thickened in proportion as the
crank pin is less than the eccentric sheave.
Having thus described the nature of the said Invention and in what
manner the same is to be performed, I claim, the use of a rotary engine,
fluid meter, or pump, wherein an eccentric or crank on a shaft within a
cylinder is surrounded by a band fitting to the interior surface of the
cylinder, and having a slab or arm sliding through a rocking joint at
the-side of the cylinder; ports or passages being provided so that fluid
under pressure admitted on the one side of the slab and discharged on
the other side causes the shaft to revolve, or that when the shaft is
caused to revolve its rotation effects, the pumping or forcing of fluid,
substantially as herein described.
In witness whereof, I, the said Walter Eccleston Bartrum, have
hereunto set my hand and seal, this Fourteenth day of March, in
the year of our Lord One thousand eight hundred and seventy-
six.

page_text: LETTERS PATENT to Walter Eccleston Bartrum, of Glen Mona,
Streatham, in the County of Surrey, for the Invention of "IMPROVE-
MENTS IN ROTARY ENGINES, PUMPS, OR METERS."-Partly a communi-
cation from abroad by Henry Coke Powell, residing at Limogne,
France.
PROVISIONAL SPECIFICATION left by the said Walter Eccleston
Bartrum at the Office of the Commissioners of Patents, with his
Petition, on the 22nd September 1875.
I, WALTER ECCLESTON BARTRUM, of Glen Mona, Streatham, in the
County of Surrey, do hereby declare the nature of the said Inven-
tion for "IMPROVEMENTS IN ROTARY ENGINES, PUMPS, OR METERS," to be as
follows:-
This Invention relates to rotary apparatus that may be employed as
an engine worked by steam of other fluid under pressure, or as a pump
for raising or forcing fluids, or as a liquid or fluid meter.

page_text: This apparatus consists of a cylinder, in the axis of which is mounted-
a shaft having on it an eccentric or crank. On this eccentric or crank
is fitted a strap of such thickness that its exterior is in contact with¯¯|
the interior surface of the cylinder. From one side of the said strap an
arm or slab projects through bushes mounted in the side of the cylinder
through which bushes it can freely slide, while these bushes themselves
can partly rotate. A port or passage is formed through the side of the
cylinder near the said bushes on the one side thereof, and another part is
likewise provided on their other side; steam or other fluid under pressure.
-being-admitted_by_the_one of these ports, while an escape-is-provided
at the other port, the excess of pressure on the one side of the eccentric
or crank causes it to revolve and the shaft to rotate therewith, the
Or if the
apparatus thus forming a rotary engine or fluid meter.
shaft be caused to rotate by power applied thereto, fluid will be drawn.
in at one of the ports and will be forced out at the other; the apparatus
thus constituting a rotary pump or instrument for raising or forcing
fluids.
Either of the ports mentioned above instead of being formed in the
side of the cylinder might be formed as a passage in the slab arm of the
eccentric strap, opening at its outer end into a chamber connected with
either the supply or the discharge, and at its inner end opening by a
lateral aperture into the cylinder.
in pursuan
filed by the said Walter Eccleston Bartrum in the Great Seal Patent
Office on the 17th March 1876.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, WALTER
ECCLESTON BARTRUM, of Glen Mona, Streatham, in the County of Surrey,
send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-second day of September, in
the year of our Lord One thousand eight hundred and seventy-five, in
the thirty-ninth year of Her reign, did, for Herself, Her heirs and suc-
cessors, give and grant unto me, the said Walter Eccleston Bartrum,
Her special license, that I, the said Walter Eccleston Bartrum, my

page_text: executors, administrators, and assigns, or such others as I, the said
Walter Eccleston Bartrum. my executors, administrators, and assigns,
hould at any time agree with, and no others, from time to time and
all times thereafter during the term therein expressed, should and
3 lawfully might make, use, exercise, and rond, within the United
Kingdom of Great Britain and Ireland, the Channel Islands, and Isle
of Man, an Invention for "IMPROVEMENTS IN ROTARY ENGINES, PUMPS, OF
MIETERS," (the result partly of a communication made to me from
abroad by Henry Coke Poweil, residing at Limogne, France, and partly
of an Invention made by myself) upon the condition (amongst others)
that I, the said Walter Eccleston Bartrum, 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 per-
formed, 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 Walter Eccleston Bartrum, 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, reference being had to the
accompanying Sheet of Drawings and to the figures and letters marked
thereon, that is to say :-
This Invention relates to rotary apparatus that may be employed as
an engine worked by steam or other fluid under pressure, or as a pump
for raising or forcing fluids, or as a liquid or fluid meter.
This apparatus consists of a cylinder in the axis of which is mounted
a shaft having on it an eccentric or crank. On this eccentric or crank
is fitted a strap of such thickness that its exterior is in contact with
the interior surface of the cylinder. From one side of the said strap an
arm or slab projects through bushes mounted in the side of the cylinder
hrough which bushes it can freely slide, while these bushes themselves
an partly rotate. A port or passage is formed through the side of the
ylinder near the said bushes on the one side thereof, and another port is
ikewise provided on their other side; steam or other fluid under pressure
eing admitted by the one of these ports, while an escape is provided at
he other port, the excess of pressure on the one side of the eccentric
crank causes it to revolve and the shaft to rotate therewith, the

page_text: sliding face pieces g³, g², set forward by setting screws or springs, or the
one by a setting screw and the other by a volute spring 7, as shewn
in Fig. 2, to keep the ends of the joint G and the edges of the slab F
tight. A portf is formed in the slab F communicating at its end with
the cavity H, and having a side opening f¹; there are also formed by
grooves or chases h, h³, on the one side of the joint G and its seating a
passage or passages by which in certain positions of the moving parts,
as shewn in Fig. 4, fluid can pass from H to A, and in other positions,
as in Figs. 1 and 3, its passage is stopped. The cavity H is supplied
with steam or other fluid under pressure by a pipe I, and at the side of
the cylinder A, close to the joint G, is an outlet passage O communi-
cating with a discharge pipe K.
The apparatus operates as follows:-The eccentric C being in the
position shewn in Fig. 4, the steam or working fluid flows from H by the
passages ¹, h, into the cylinder A and pressing on the one side of the
eccentric band D causes the eccentric and shaft B to revolve towards
the position shewn in Fig. 1, when the passages h¹, h, are cut off, but a
fresh passage for the fluid is presented by the exposure of the side
opening of the port f. The rotation of the shaft and eccentric con-
tinues till they attain the position shewn in Fig. 3, by which time the
supply by f' has been cut off, but the movement is continued by the
expansion of the fluid already supplied to the one side of the cylinder A
until the discharge outlet O is exposed, whereupon the fluid escapes
by the discharge pipe K after having done its work in the cylinder,
and the like action is repeated in every revolution. The shaft B may
be provided with a fly wheel to carry the eccentric and moving parts
over the dead centre which occurs when the eccentric stands in the
position opposite to that shewn in Fig. 1. Or two engines such as I
have described may be arranged to act on the same shaft, their eccentrics
being set opposite to one another, or nearly so.
I have described the operation of the apparatus as an engine, by
which the pressure of a fluid is made to give rotary motion to a shaft,
either for the production of motive power or to act as a meter for the
measurement of the fluid passing through a cylinder of known capacity.
It may be readily understood however, that by giving from an extra-
neous source rotary motion to the shaft B the apparatus could be made
to act as a pump for raising or forcing fluids, the pipes I and K serving
either for inlet or for outlet respectively, according to the direction in in

page_text: which the shaft B may be caused to revolve. Instead of the eccentric
sheave C fixed on the shaft B a crank forming part of the shaft itself
might be employed,-the-band D being thickened in proportion as the
crank pin is less than the eccentric sheave.
Having thus described the nature of the said Invention and in what
manner the same is to be performed, I claim, the use of a rotary engine,
fluid meter, or pump, wherein an eccentric or crank on a shaft within a
cylinder is surrounded by a band fitting to the interior surface of the
cylinder, and having a slab or arm sliding through a rocking joint at
the side of the cylinder;-ports-or-passages-being_provided so that fluid
under pressure admitted on the one side of the slab-and-discharged-on-
the other side causes the shaft to revolve, or that when the shaft is
caused to revolve its rotation effects, the pumping or forcing of fluid,
substantially as herein described.