IMPROVEMENTS IN CONSTRUCTING SHIPS OR VESSELS PROPELLED BY TWIN PROPELLERS, AND IN CORDAN RINGINES FOR GIVING MOTION TO THE SAME."
Year: 1866

page_text: LETTERS PATENT to William Dudgeon, of 10, London Street, Fenchurch
Street, in the City of London, for the Invention of "IMPROVEMENTS IN
CONSTRUCTING SHIPS OR VESSELS PROPELLED BY TWIN PROPELLERS, AND IN
CORDAN RINGINES FOR GIVING MOTION TO THE SAME."
PROVISIONAL SPECIFICATION left by the said William Dudgeon at
the Office of the Commissioners of Patents, with his Petition, on the
9th October 1866.
I, WILLIAM DUDGEON, of 10, London Street, Fenchurch Street, in the
City of London, do hereby declare the nature of the said Invention for
"IMPROVEMENTS IN CONSTRUCTING SHIPS OR VESSELS PROPELLED BY TWIN PRO-
PELLERS, AND IN STEAM ENGINES FOR GIVING MOTION TO THE SAME," to be as
follows:-
This Invention has for its object improvements in constructing ships or
vessels propelled by twin propellers, and in steam engines for giving motion to
For these purposes, in constructing the after part of a ship or
vessel propelled by twin propellers where external stern tubes are used pro-
jecting to a distance from the after parts of the body of the ship or vessel,
such stern tubes are, according to the present Invention, connected together
horizontally (or as nearly so as may be) from end to end by means of framing.
and plating, bracing them together to and through the body; or, in some

page_text: cases, in place of two stern tubes being used the screw shafts are enclosed in
chambers formed by plating, and projecting horizontally on each side of the
stern of the ship or vessel; these chambers serve as the stern tubes for the two
propeller shafts, and in the interior of the after parts of the body of the ship
or vessel there is a horizontal framing and plating corresponding in position
with the outer plating above mentioned, by which conjoined construction
great additional strength and stability are obtained.
In constructing steam engines for giving motion to twin propeller shafts
two pairs of steam cylinders are used, one pair to each of the two cranked
shafts; the two pairs of steam cylinders are arranged in inclined positions
and end to end. The angular space below the two pairs of steam cylinders and
between them and the floors of the ship or vessel is enclosed and formed into
a condenser or condensers, and it is preferred that the air and other pumps
and hot well or wells should also be included in the angular space below the
steam cylinders. The framing for carrying the two propeller shafts is formed
on either side and combined with the framing and parts which carry the two
pairs of steam cylinders and inclose the angular space below them.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said William Dudgeon in the Great Seal Patent Office on the
9th April 1867.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, WILLIAM
DUDGEON, of 10, London Street, Fenchurch Street, in the City of Lonond,
send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
l'atent, bearing date the Ninth day of October, in the year of our Lord One
thousand eight hundred and sixty-six, in the thirtieth year of Her reign,
did, for Herself, Her heirs and successors, give and grant unto me,
the said William Dudgeon, Her special licence that I, the said William
Dudgeon, my executors, administrators, and assigns, or such others as I,
the said William Dudgeon, 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 " IM-
PROVEMENTS IN CONSTRUCTING SHIPS OR VESSELS PROPELLED BY TWIN PROPELLERS.
AND IN STEAM ENGINES FOR GIVING MOTION TO THE SAME," upon
upon the con-

page_text: dition (amongst others) that I, the said William Dudgeon, 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 William Dudgeon, 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 has for its object improvements in constructing ships or
vessels propelled by twin propellers, and in steam engines for giving motion
to the same.
In constructing the after parts of a ship or vessel propelled by twin propellers
where external stern tubes are used projecting to a distance from the after
parts of the body of the ship or vessel, such stern tubes arc, according to the
present Invention,connected together horizontally or as nearly so as may be)
from end to end by means of. framing and plating, bracing them together to
and through the body; or, in some cases, in place of two stern tubes being
used the screw shafts are enclosed in chambers formed by plating, and pro-
jecting horizontally on each side of the stern of the ship or vessel; these
chambers serve as the stern tubes for the two propeller shafts, and in the
interior of the after parts of the body of the ship or vessel there is a horizontal
framing and plating corresponding in position with the outer plating above
mentioned, by which conjoined construction great additional strength and
stability are obtained.
Figure 1 is a side view of a portion of a ship or vessel constructed according
to this part of my Invention; Figure 2 is a horizontal section, and Figure 3 is
a vertical section of the same.
a, a, are the ribs of the vessel; b, b, its skin or plating; c is a transverse
bulkhead near the point where the chambers d, d, for the screw shafts spring
out of the side of the vessel. Immediately in front of the bulkhead c, as will
be seen, the ribs and skin of the vessel follow the curve of the mouth of the
chamber, but a baft the bulkhead the ribs and skin of the vessel come between
the chambers and are formed independently of them. e,e,are forged brackets
bolted to the side of the vessel to carry the after ends of the chambers d, and
the plating which forms the chamber is rivetted along each edge to the side
of the ship and at the back to the bracket; it is closed in at the back in any

page_text: convenient way. ff, is a horizontal bulkhead meeting the skin of the vessel
on the inside where the platings of the screw shaft chambers meet it on the
outside, so that a complete web is formed stretching from one propeller sliaft
to the other through the vessel. The chambers d may be complete tubes,
and in this case the web which connects these tubes to the vessel on each
side will be single and will be rivetted to the tube from end to end. g is a
vertical bulkhead opposite the brackets e, e, to further increase the stiffness
of the frame; h, h, are tubes of brass or other metal in which the screw
shafts are encased as is usual; they pass from end to end of the chambers d
through the bulkhead c in front, and through the ayes of the brackets e at
the back, and behind the eye of the bracket each tube receives a screw nut h¹,
which securely fixes it by drawing a flange at its forward end against the
face of the bulkhead c; i, i, are the propeller shafts clothed with brass as is
usual, and working through stuffing boxes at the front of the tubes h, and
in bearings at their hinder ends.
In constructing steam engines for giving motion to twin propeller shafts
two pairs of steam cylinders are used, one pair to each of the two cranked
shafts; the two pairs of steam cylinders are arranged in inclined positions and
end to end. The angular space below the two pairs of steam cylinders and
between them and the floor of the ship or vessel is enclosed and formed into a
condenser or condensers, and the air and other pumps and hot well or wells
are also included in the angular space below the steam cylinders. The
framing for carrying the two propeller shafts is formed on either side and
combined with the framing and parts which carry the two pairs of steam
cylinders and inclose the angular space below them.
Figure 4 is a longitudinal section of engines thus arranged; Figure 5 is a
plan, partly in section, of the same, and Figure 6 is one-half of a transverse
section taken on the centre line of Figures 4 and 5.
The frame of the engine is made in three parts, and in the central part is
formed the condenser a, the air-pump chamber b, and the hot well c; on the
top of the condenser are mounted the steam cylinders d, d, two on each side,
and the cylinders on opposite sides are end to end; their piston rods are
guided by slides on the frame, and by means of connecting rods e drive the
two crank shafts f,f, which at f¹, f₁, are coupled with the screw shafts. The
slide valves of the cylinders are on their outer sides, and are worked by
eccentrics not shown in the Drawings. The air-pump plungers g, g, each
works through a packing in the centre of the condenser, as is shown, and
receives its motion from a connecting rod embracing the crank pin of the
propeller shaft, and jointed at the other end to the rod of the plunger, which

page_text: is controlled by a slide on the frame. As the valves opening into the hot well
are at the top of the air-pump chamber this chamber is always nearly filled
with water; the excess of water and the air which the pump draws from the
condenser is forced into the hot well, and from thence escape in any con-
venient manner. The feed pumps are not shown; they may be worked in
any ordinary way.
In witness whereof, I, the said William Dudgeon, have hereunto set my
hand and seal, this Ninth day of April, in the year of our Lord One
thousand eight hundred and sixty-seven.
WILLIAM DUDGEON. (L.s.)

page_text: LETTERS PATENT to William Dudgeon, of 10, London Street, Fenchurch
Street, in the City of London, for the Invention of "IMPROVEMENTS IN
CONSTRUCTING SHIPS OR VESSELS PROPELLED BY TWIN PROPELLERS, AND IN
STEAM ENGINES FOR GIVING MOTION TO THE SAME."
Sealed the 19th February 1867, and dated the 9th October 1866.
PROVISIONAL SPECIFICATION left by the said William Dudgeon at
the Office of the Commissioners of Patents, with his Petition, on the
9th October 1866.
I, WILLIAM DUDGEON, of 10, London Street, Fenchurch Street, in the
City of London, do hereby declare the nature of the said Invention for
" IMPROVEMENTS IN CONSTRUCTING SHIPS OR VESSELS PROPELLED BY TWIN PRO-
PELLERS, AND IN STEAM ENGINES FOR GIVING MOTION TO THE SAME," to be as
follows:-
This Invention has for its object improvements in constructing ships or
vessels propelled by twin propellers, and in steam engines for giving motion to
the same. For these purposes, in constructing the after part of a ship or
vessel propelled by twin propellers where external stern tubes are used pro-
jecting to a distance from the after parts of the body of the ship or vessel,
such stern tubes are, according to the present Invention, connected together
horizontally (or as nearly so as may be) from end to end by means of framing
and plating, bracing them together to and through the body; or, in some

page_text: cases, in place of two stern tubes being used the screw shafts are enclosed in
chambers formed by plating, and projecting horizontally on each side of the
stern of the ship or vessel; these chambers serve as the stern tubes for the
two propeller shafts, and in the interior of the after parts of the body of the
ship or vessel there is a horizontal framing and plating corresponding in
position with the outer plating above mentioned, by which conjoined con-
struction great additional strength and stability are obtained.
In constructing steam engines for giving motion to twin propeller shafts
two pairs of steam cylinders are used, one pair to each of the two cranked
shafts; the two pairs of steam cylinders are arranged in inclined positions
and end to end. The angular space below the two pairs of steam cylinders and
between them and the floors of the ship or vessel is enclosed and formed into
a condenser or condensers, and it is preferred that the air and other pumps
and hot well or wells should also be included in the angular space below the
steam cylinders. The framing for carrying the two propeller shafts is formed
on either side and combined with the framing and parts which carry the two
pairs of steam cylinders and inclose the angular space below them.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said William Dudgeon in the Great Seal Patent Office on the
9th April 1867.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, WILLIAM
DUDGEON, of 10, London Street, Fenchurch Street, in the City of London,
send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Ninth day of October, in the year of our Lord One
thousand eight hundred and sixty-six, in the thirtieth year of Her reign,
did, for Herself, Her heirs and successors, give and grant unto me,
the said William Dudgeon, Her special licence that I, the said William
Dudgeon, ny executors, administrators, and assigns, or such others as I,
the said William Dudgeon, 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 "In-
PROVEMENTS IN CONSTRUCTING SHIPS OR VESSELS PROPELLED BY TWIN PROPELLERS,
AND IN STEAM ENGINES FOR GIVING MOTION TO THE SAME," upon the con-

page_text: dition (amongst others) that I, the said William Dudgeon, 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 William Dudgeon, 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 has for its object improvements in constructing ships or
vessels propelled by twin propellers, and in steam engines for giving motion to
the same.
In constructing the after parts of a ship or vessel propelled by twin propellers
where external stern tubes are used projecting to a distance from the after
parts of the body of the ship or vessel, such stern tubes are, according to the
present Invention, connected together horizontally (or as nearly so as may be)
from end to end by means of framing and plating, bracing them together to
and through the body; or, in some cases, in place of two stern tubes being
used the screw shafts are enclosed in chambers formed by plating, and pro-
jecting horizontally on each side of the stern of the ship or vessel; these
chambers serve as the stern tubes for the two propeller shafts, and in the
interior of the after parts of the body of the ship or vessel there is a horizontal
framing and plating corresponding in position with the outer plating above
mentioned, by which conjoined construction great additional strength and
stability are obtained:
Figure 1 is a side view of a portion of a ship or vessel constructed according
to this part of my Invention; Figure 2 is a horizontal section, and Figure 3 is
a vertical section of the same.
a, a, are the ribs of the vessel; b, b, its skin or plating; o is a transverse
bulkhead near the point where the chambers d, d, for the screw shafts spring
out of the side of the vessel. Immediately in front of the bulkhead c, as will
be seen, the ribs and skin of the vessel follow the curve of the mouth of the
hamber, but abaft the bulkhead the ribs and skin of the vessel come between.
he chambers and are formed independently of them. e,.e, are-forged brackets.
olted to the side of the vessel to carry the after ends of the chambers d, and
he plating which forms the chamber is rivetted' along each edge to the side
f the ship and at the back to the bracket;, it is closed in at the back in any

page_text: convenient way. f,f, is a horizontal bulkhead meeting the skin of the vessel
on the inside where the platings of the screw shaft chambers meet it on the
outside, so that a complete web is formed stretching from one propeller shaft
to the other through the vessel. The chambers & may be complete tubes, and
in this case the web which connects these tubes to the vessel on each side will
be single and will be rivetted to the tube from end to end. g is a vertical
bulkhead opposite the brackets e, e, to further increase the stiffness of the
frame; h,h, are tubes of brass or other metal in which the screw shafts are
encased as is usual; they pass from end to end of the chambers d, through the
bulkhead c in front, and through the eyes of the brackets e at the back, and
behind the eye of the bracket each tube receives a screw nut h¹, which securely
fixes it by drawing a flange at its forward end against the face of the bulk-
head c; i, i, are the propeller shafts clothed with brass as is usual, and working
through stuffing boxes at the front of the tubes h, and in bearings at their
hinder ends.
In constructing steam engines for giving motion to twin propeller shafts
two pairs of steam cylinders are used, one pair to each of the two cranked
shafts; the two pairs of steam cylinders are arranged in inclined positions and
end to end. The angular space below the two pairs of steam cylinders and
between them and the floor of the ship or vessel is enclosed and formed into a
condenser or condensers, and the air and other pumps and hot well or wells
are also included in the angular space below the steam cylinders. The
framing for carrying the two propeller shafts is formed on either side and
combined with the framing and parts which carry the two pairs of steam
cylinders and inclose the angular space below them.
"
Figure 4 is a longitudinal section of engines thus arranged; Figure 5 is a
plan, partly in section, of the same, and Figure 6 is one-half of a transverse
section taken on the centre line of Figures 4 and 5.
The frame of the engine is made in three parts, and in the central part is
formed the condenser a, the air-pump chamber b, and the hot well c; on the
top of the condenser are mounted the steam cylinders d, d, two on each side,
and the cylinders on opposite sides are end to end; their piston rods are
guided by slides on the frame, and by means of connecting rods e drive the
two crank shafts f, f, which at f,f¹, are coupled with the screw shafts. The
slide valves of the cylinders are on their outer sides, and are worked by
eccentrics not shown in the Drawings. The air-pump plungers 9, 9, each
works through a packing in the centre of the condenser, as is shown, and
receives its motion from a connecting rod embracing the crank pin of the
propeller shaft, and jointed at the other end to the rod of the plunger, which

page_text: is controlled by a slide on the frame. As the valves opening into the hot well
are at the top of the air-pump chamber this chamber is always nearly filled
with water; the excess of water and the air which the pump draws from the
condenser is forced into the hot well, and from thence escape in any con-
venient manner. The feed pumps are not shown; they may be worked in
any ordinary way.
In witness whereof, I, the said William Dudgeon, have hereunto set my
hand and seal, this Ninth day of April, in the year of our Lord One
thousand eight hundred and sixty-seven.
WILLIAM DUDGEON. (L.S.)