IMPROVE- MENTS IN ENGINES AND BOILERS SPECIALLY APPLICABLE FOR AGRICULTURAL PURPOSES
Year: 1863

page_text: LETTERS PATENT to Richard Archibald Brooman, of 166, Fleet Street,
in the City of London, Patent Agent, for the Invention of "IMPROVE-
MENTS IN ENGINES AND BOILERS SPECIALLY APPLICABLE FOR AGRICULTURAL
PURPOSES." A communication from abroad by Jean Baptiste Pierret,
and André Schweizer, both of Paris, France.
Sealed the 10th May 1864, and dated the 14th November 1863.
PROVISIONAL SPECIFICATION left by the said Richard Archibald Brooman
at the Office of the Commissioners of Patents, with his Petition, on the
14th November 1863.
J, RICHARD ARCHIBALD BROOMAN, of 166, Fleet Street, in the City of
London, Patent Agent, do hereby declare the nature of the said Invention for
"IMPROVEMENTS IN ENGINES AND BOILERS SPECIALLY APPLICABLE FOR AGRICULTURAL
PURPOSES," to be as follows:-
The furnace of the boiler is arranged so as to be readily removable for
cleaning and repairs, and the boiler is calculated to afford extended heating
surface to the action of the fire. The engine is an improved rotary engine.
I will first describe the boiler. The boiler consists of an outer cylindrical
casing surmounted with a steam dome. Inside this casing is the furnace running
longitudinally in the form of a truncated cone, it occupies a position concentric
with the casing; running across the furnace are water spaces which cross each
other at any desired angle, these cross water spaces are open at both ends to
the body of water in the boiler. Towards each end of the cylindrical casing a
tubular plate is rivetted, these plates receive a number of tubes, through which
the return of the flame and products of combustion takes place. These tubes

page_text: open into the smoke box at the fore part of the boiler. A ring with two flanges is
rivetted by one flange to the front tubular plate, while the other flange bas bolted
to it the front of the conical furnace, the back end of the furnace is bolted to the
back tubular plate. A door is provided at the fore end of the furnace. The
cylindrical casing is closed at back by a movable plate. When the boiler
before described and the improved rotary engine about to be described are
used together the engine is placed on the boiler and steam is taken by a pipe
from the steam dome."
The engine is constructed. and arranged as follows:-A cylinder closed at
the two ends by plates carrying stuffing boxes is made with an opening for the
outlet of steam, while the inlet takes place through one of the plates. At the
upper part of the cylinder an opening or recess is made for the reception of a
movable slide upon the back of which springs are made to press. The axis of
the circular piston, which is also the main shaft of the engine, is placed
excentrically in the ratio of one to six of the radius of the cylinder, so as to be
in contact with the movable slide. The piston is formed with two mortises in
which two slides work, and these slides are kept in contact with the interior
of the cylinder by steam introduced behind them. To compensate for the
lateral wear of the piston slides a plate is inserted inside one of the end plates
before named and is kept pressed inwards by springs placed at the back.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Richard Archibald Brooman in the Great Seal Patent Office
on the 14th May 1864.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, RICHARD
ARCHIBALD BROOMAN, of 166, Fleet Street, in the City of London, Patent
Agent, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Fourteenth day of November, in the year of our Lord
One thousand eight hundred and sixty-three, in the twenty-seventh year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me, the
said Richard Archibald Brooman, Her special licence that I, the said Richard
Archibald Brooman, my executors, administrators, and assigns, or such others
as I, the said Richard Archibald Brooman, 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

page_text: for "IMPROVEMENTS IN ENGINES AND BOILERS SPECIALLY APPLICABLE FOR AGRICUL-
TURAL PURPOSES," (communicated to me from abroad by Jean Baptiste Pierret
and André Schweizer, both of Paris, France,) upon the condition (amongst
others) that I, the said Richard Archibald Brooman, 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 Richard Archibald Brooman, 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 Drawings hereunto
annexed, that is to say :-
The furnace of the boiler is arranged so as to be readily removeable for
cleaning and repairs, and the boiler is calculated to afford extended heating
surface to the action of the fire. The engine is an improved rotary engine.
I will first describe the boiler. The boiler consists of an outer cylindrical
casing surmounted with a steam dome. Inside this casing is the furnace
running longitudinally in the form of a truncated cone, it occupies a position
concentric with the casing. Running across the furnace are water spaces
which cross each other at any desired angle, these cross water spaces are open
at both ends to the body of water in the boiler. Towards each end of the
cylindrical casing a tubular plate is rivetted, these plates receive a number of
tubes through which the return of the flame and products of combustion takes
place. The tubes open into the smoke box at the fore part of the boiler. A
ring with two flanges is rivetted by one flange to the front tubular plate, while
the other flange has bolted to it the front of the conical furnace, the back end
of the furnace is bolted to the back tubular plate. A door is provided at the
fore end of the furnace. The cylindrical casing is closed at back by a moveable
plate. When the boiler before described, and the improved rotary engine
about to be described, are used together, the engine is placed on the boiler
and steam is taken by a pipe from the steam dome.
The engine is constructed and arranged as follows:-A cylinder closed at
the two ends by plates carrying stuffing boxes is made with an opening for
the outlet of steam while the inlet takes place through one of the plates. At
upper part of the cylinder an opening or recess is made for the reception
of a moveable slide upon the back of which springs are made to press.
the
The

page_text: axis of the circular piston, which is also the main shaft of the engine, is placed
excentrically in the ratio of one to six of the radius of the cylinder, so as
to be in contact with the moveable slide. The piston is formed with two
mortises in which two slides work, and these slides are kept in contact
То
with the interior of the cylinder by steam introduced behind them.
compensate for the lateral wear of the piston slides a plate is inserted inside
one of the end plates before named and is kept pressed inwards by springs
placed at the back.
Figure 1 of the accompanying Drawings is a transverse section through
the broken line 1, 2, 3, 4, of Figure 2, and Figure 2 is a longitudinal section
through the line 5, 6, of Figure 1 of an engine and boiler constructed
according to this Invention.
A is an outer cylindrical casing surmounted by a steam dome B; C is the
furnace inside the casing A running longitudinally in the form of a truncated
cone and occupying a position concentric with the casing; D, D, are water
spaces running across the furnace C, and which may cross each other at any
desired angle, they are open at both ends E to the body of water in the boiler
the generation of steam is thus greatly increased; G, G', are tubular plates
rivetted one near each end of the casing A, they receive a number of tubes
H, H, through which the return of the flame and the products of combustion
takes place. The tubes H, H, open into the smoke box I on which the chimney
J is fixed. A ring with two flanges K, O, is rivetted by the flange K to the
plate G, while the other flange O has bolted to it the front of the furnace C;
the back end of the furnace is bolted to the plate G by bolts passing through a
flanged ring P, the furnace may thus be readily removed for cleaning or repairs;
R is a door at the fore end of the furnace through which the fuel is supplied to
the furnace bars Q. The cylindrical casing A is closed at back by a moveable
plate, as shown.
;
I now proceed to describe the construction and arrangement of the engine.
S is a cylinder closed at its two ends by plates T, T', carrying shiffing boxes.
The cylinder S is made with an opening a for the outlet of steam, while the
inlet takes place through the plate T by a pipe or passage 6 communicating
with the steam dome B. An opening or recess d is made at the upper part
of the cylinder S for the reception of a moveable slide U upon the back of
which a coiled spring e, Figure 2, or a flat spring e', Figure 1, is made to
press; this slide U has the same curve or bend as the cylinder and assists in
compensating for the wear of the moving parts of the engine; V is a circular
piston, the axis of which, which is also the main shaft of the engine, is placed
èxcentrically in the ratio of one to six of the radius of the cylinder, so as to be

page_text: in contact with the movable slide U and to prevent all escape of steam at
back. The piston V is formed with two mortices, in which two slides X, X',
work. The slide X carries a cylindrical rod t which passes through the axis of
the piston and fits into a socket 11 carried by the slide X'; the rod / is fitted
with two elastic rings m, m. In each slide X, X', a hole n is formed com-
municating with the socket l' in the space y in order to form a steam cushion,
the elasticity or force of which keeps the slides X, X¹, in contact with the
interior of the cylinder; the wear of these slides produced by the revolution of
the piston is thus compensated for. Z is a plate inserted inside the plate T¹ and
pressed against the piston V by springs p, p, whereby the lateral wear of the
slides X, X', is also compensated for. The distribution of the steam is effected
by two channels or passages 7, 21, formed on the face of the piston V; these
channels, which communicate at t with the circumference of the piston, meet
after the passage of each of the slides X, X', with the steam inlet orifice b,
steam thus enters the space and the steam pressure is exerted on the
surface of the slide which performs a half revolution. The full pressure takes
place during part of the course, the remainder may be operated by expansion
if desired. The degree of expansion depends on the greater or less extent of
the channel r. Each of the slides X, X', is thus presented at the same point
for being acted on by the steam in order to impart a continuous and regular
rotary motion to the piston V. The feed apparatus of the boiler, the cocks,
guages, and other parts are of the ordinary construction.
And having now described the nature of the said Invention, and in what
manner the same is to be performed, I declare that I claim,-
First, constructing and arranging boilers substantially as herein-before
described and illustrated in the accompanying Drawings.
Second, constructing and arranging engines substantially as herein-before
described and illustrated in the accompanying Drawings.
Third, the combination of boiler and engine herein-before described and
illustrated in the accompanying Drawings.
In witness whereof, I, the said Richard Archibald Brooman, have
hereunto set my hand and seal, this Fourteenth day of May, One
thousand eight hundred and sixty-four.