IMPROVEMENTS IN STEAM ENGINES LICABLE FOR MARINE AND OTHER PURPOSES URPOSES.
Year: 1870

page_text: LETTERS PATENT to William Denison and Henry Teall, both of Leeds,
in the County of York, for the Invention of "IMPROVEMENTS IN STEAM
ENGINES
LICABLE FOR MARINE AND OTHER PURPOSES
URPOSES.
Sealed the 8th July 1870, and dated the 12th January 1870.
PROVISIONAL SPECIFICATION left by the said William Denison and
Henry Teall at the Office of the Commissioners of Patents, with
their Petition, on the 12th January 1870.
We, WILLIAM DENISON and HENRY TEALL, both of Leeds, in the
County of York, do hereby declare the nature of the said Invention for
"IMPROVEMENTS IN STEAM ENGINES APPLICABLE FOR MARINE AND OTHER PURPOSES,"
to be as follows:-
The Invention relates to certain improvements whereby two shafts:
or cranks may be made to revolve in opposite directions or the same
directions driven simultaneously, which Invention is particularly
applicable for driving twin screw propellers, but may be applied on
land for pumping purposes or where two shafts or cranks are required.
to be driven at the same time..

page_text: Our Invention consists in the use of one cylinder, one slide valve, one
compound trunk, and one piston only, and two connecting rods, which
are attached to the cranks on the screw propeller shafts and also to the
interior of the trunk. On each of the propeller shafts is placed a disc
which is used to give any desired position to the cranks before starting
the engine, by which means the propeller shafts are made to revolve
in any required direction. The altered position to the disc may be
Given hy a lever or other mechanical means.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said William Denison and Henry Teall in the Great
Seal Patent Office on the 12th July 1870.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, WILLIAM
DENISON and HENRY TEALL, both of Leeds, in the County of York,
send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twelfth day of January, in the year of
our Lord One thousand eight hundred and seventy, in the thirty-third
year of Her reign, did, for Herself, Her heirs and successors, give and
grant unto us, the said William Denison and Henry Teall, Her special
licence that we, the said William Denison and Henry Teall, our exe-
cutors, administrators, and assigns, or such others as we; the said
William Denison and Henry Teall, our 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; a
Kingdom of Great Britain and Ireland, the Channel Islands, and Isle
of Man, an Invention for "IMPROVEMENTS IN STEAM ENGINES APPLICABLE FOR
MARINE AND OTHER PURPOSES," upon the condition (amongst others) that
we, the said William Denison and Henry. Teall, our executors or ad-.
'.

page_text: ministrators, by an instrument in writing under our, or one of our,
.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 imme-
diately after the date of the said Letters Patent.
NOW KNOW YE, that we, the said William: Denison and Henry
Teall, do hereby declare the nature of our said Invention, and in what
manner the same is to be performed, to be particularly described. and
ascertained. in. and by the following statement, reference being had to the
accompanying Drawings, and to the letters of reference marked thereon,
that is to say
The Invention. relates to certain improvements whereby two shafts
or cranks may be made to revolve in opposite directions or the same
direction driven simultaneously, which Invention is particularly applicable
for driving twin screw propellers, but may be applied on land for pumping
purposes or where two shafts or cranks are required.to.be driven at the
same time..
Our Invention: consists in the use of one cylinder, one slide valvo, one
compound. trunk, and one piston only, and two connecting rods, which
are attached to the cranks on the screw. propeller shafts and also to the
interior of the trunk.. On, each of the propeller shafts a disc is placed
which is used to give the desired position to the cranks before starting
the engine, by which means the propeller shafts are made to revolve in.
any required direction. The altered position to the disc may be given
by a lever or other mechanical means.
The other parts of the engine not referred to may be of ordinary.
construction..
And in order that our Invention may be more fully understood, we
annex and proceed to describe the accompanying Sheet of Drawings.
which represent a complete engine.
Fig. is a cross section ;. Fig. 2 an elevation; Fig. 3 a plan; and
Fig. 4 shows the arrangement and means fór altering the motion of the
discs.
The framework or bed is shewn at a supplied with brackets on which
the cylinder is mounted into which the compound trunk c, c, is inserted

page_text: formed by two hollow cylinders or barrels coupled or bolted together at
the flanges with a boss d between them. The boss and flanges con-
nected as shewn form the piston, which may be supplied with piston
rings of ordinary construction. The cylinder covers e, e, with their
glands and stuffing boxes are of ordinary construction, but made to suit
the enlarged diameter of the compound trunk c, c. On the bed a the
plummer blocks f, g, are mounted carrying one end of the shafts h, h, on
which the discs i and j, are fitted and secured. They are supplied with
crank bosses k, k, in which the crank pins 1, 1, are fitted on which pins
one end of each connecting rod m, m, are mounted, and they may be of
ordinary construction. The other ends of the connecting rods m, m, are
provided with eyes fitted or inserted between corresponding eyes on the
boss d and coupled thereto by means of the pins n, n. The eccentrics o, o,
are shewn on the shaft on which eccentric straps of ordinary con-
struction are mounted. These are connected with the link motion p by
means of the rods q, q. Motion is transmitted from the link motion p to
the slide valve by means of the levers s and t through the spindle u,
all of which are of ordinary construction. The disc i has on its periphery
the holes 1, 2, 3, as shewn in Fig. 4. It will be readily understood that
if the crank k on the disc i be moved to the point 4, and the crank / on
the discj be in the position shewn at 5 (the bent bar 9 being used as a
fulcrum) when put in motion the disc i would revolve in the direction
of the arrow 6, whilst the disc j would revolve in the direction of
the arrow 7, but if the crank on the disc i was placed at 8 on being
set in motion both discs would revolve in the same direction subject
to the link motion, which is adjusted by the levers v and w through
link x. Fig. 3 shews an arrangement applicable to twin screw propellers;
but of course shafts for other purpose may be attached, and for pumping
the spear rods may be attached to the crank pins l, l.
:
.
Having now described the nature of our said Invention, and in what
manner the same is to be performed, we do not limit ourselves to the
precise details herein described and illustrated as the same may be varied
without departing from our Invention; but what we claim and desire to
secure by Letters Patent is,-
Firstly. The arrangement, construction, application, and method of
action of a compound trunk for steam engines, substantially as and for

page_text: Secondly. The arrangement, construction, application, and method of
action of the discs i and j, substantially in manner and for purposes
herein set forth.
In witness whereof, I, the said William Denison, for myself and
on behalf of the said Henry Teall, have hereunto set my hand
and seal, this Ninth day of July, in the year of our Lord One
thousand eight hundred and seventy.