IMPROVEMENTS IN MACHINERY USED FOR RAISING PROPELLERS
Year: 1853

page_text: LETTERS PATENT to John Dudgeon, of Saint Michael's Cham-
bers, 42, Cornhill, in the City of London, for the Invention of
"IMPROVEMENTS IN MACHINERY USED FOR RAISING PROPELLERS."
Sealed the 9th April 1853, and dated the 4th February 1853.
PROVISIONAL SPECIFICATION left by the said John Dudgeon
at the Office of the Commissioners of Patents, with his Petition,
on the 4th February 1853.
I, JOHN DUDGEON, of Saint Michael's Chambers, 42, Cornhill,
in the City of London, do hereby declare the nature of the said
Invention for "IMPROVEMENTS IN MACHINERY USED FOR RAISING PROPEL-
LERS" to be as follows: -
.
This Invention is applicable to those ships or vessels which use
propellers beyond the rudder, and have a post for carrying the
propeller astern of the rudder; in which cases heretofore there
have been no means of raising the propeller. This Invention con
sists of causing the bearing of the shaft of the propeller and the
boss or nave of the propeller to be formed in such manner that the
driving shaft may be separated from the propeller, and at the same
time allow of the propeller and its bearing being raised up the
outermost or propeller post.

page_text: SPECIFICATION in pursuance of the conditions of the Letters
Patent, filed by the said John Dudgeon in the Great Seal
Patent Office on the 4th August 1853.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I,
JOHN DUDGEON, of Saint Michael's Chambers, 42, Cornhill, in the
City of London, send greeting..
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Fourth day of February, in the
year of our Lord One thousand eight hundred and fifty-three, in
the sixteenth year of Her reign, did, for Herself, Her heirs and
successors, give and grant unto me, the said John Dudgeon, Her
special licence that I, the said John Dudgeon, my executors, ad-
ministrators, and assigns, or such others as I, the said John
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 law-
fully 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 MACHINERY USED FOR
RAISING PROPELLERS," upon the condition (amongst others) that I,
the said John Dudgeon, by an instrument in writing under my
land and seal, 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 John 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 as-
certained in and by the following statement thereof (that is to
say):
This Invention is applicable to those ships or vessels which use
propellers beyond the rudder, and have a post for carrying the pro-

page_text: peller astern of the rudder; in which cases heretofore there have
been no means of raising the propeller. This Invention consists of
causing the bearing of the shaft of the propeller and the boss or
nave of the propeller to be formed in such manner that the driving
shaft may be separated from the propeller, and at the same time
allow of the propeller and its bearing being raised up the outermost
or propeller post.
And in order that the Invention may be more fully understood
and readily carried into effect, I will proceed to describe the means
pursued by me.
DESCRIPTION OF THE DRAWING.
Figure 1, shows part of a side view of a ship or vessel fitted ac-
cording to my Invention; Figure 2, shows a stern view thereof;
and in these views the propeller is shown to be in its place for pro-
pelling. Figure 3, shows part of a side view, and Figure 4, shows
part of a longitudinal section of a like ship or vessel; the forms of
the stern posts, however, being somewhat different in the two cases;
the propeller in each of these Figures being shewn to be separated;
from the shaft and raised. In each of these Figures the same letters
are used to indicate the same parts.
a is the propeller shaft, which is to be capable of being moved
endways, in order that it may be connected with and disconnected
from the propeller 6, when desired, as will readily be understood
by reference to the Drawing. c is the rudder post, and d the
propeller or outermost post. The rudder works between the two
posts c and d, and the rudder is in two parts, which are connected
together, as is well understood, in order to allow of propeller shaft
passing beyond the rudder. e is the bearing in which the hollow
part of the propeller axis turns, as is shown in the Drawing, such
hollow part receiving the end of the propeller shaft a, which re-
ceives motion from the engines. The bearing e is made to slide
between the two plates d, d, of which the outermost or propeller
post is composed, and the bearing is moved up and down by means
of a rack f and pinion g, as shown, or by other convenient means;

page_text: and the stern of the vessel and the post d, d, may be made to allow
of the propeller coming more in board if desired.
Having thus described the nature of my Invention, and the
manner of performing the same, I would have it understood that I
do not confine myself to the precise-details as herein described, so
long as the peculiar character of my Invention be retained'; and I
make no claim to the parts separately which are herein described;
but what I claim is, the constructing and combining the parts. in
such manner that a propeller which works beyond the rudder may
be separated from the propeller shaft, and raised with its bearing
up the outermost post.
In witness whereof, I, the said John Dudgeon, have here-
unto set my hand and seal, this Fourth day of August,
in the year of our Lord One thousand eight hundred and
fifty-three
Witness,
W. TONGUE.
JOHN DUDGEON." (L.S.)