IMPROVEMENTS IN SCREW PROPELLERS FOR SHIPS
Year: 1876

page_text: LETTERS PATENT to Thomas Winter Starck Renouf, of 2, Canterbury Place,
Stopford Road, in the Parish of St. Helier's, in the Island of Jersey, Gentle-
man, for the Invention of " IMPROVEMENTS IN SCREW PROPELLERS FOR SHIPS."
PROVISIONAL SPECIFICATION left by the said Thomas Winter Starck Renouf
at the Office of the Commissioners of Patents on the 7th June 1876.
THOMAS WINTER STARCK RENOUF, of 2, Canterbury Place, Stopford Road, in the
"IMPROVEMENTS IN
Parish of St. Helier's, in the Island of Jersey, Gentleman.
SCREW PROPELLERS FOR SHIPS."
By this Invention I propose to employ two or more blades or fans suitably formed
or shaped in the manner hereafter described upon an elongated boss of suitablo
length and proportion, and so continued on the after side to such a length with a
view to materially lessen vibration, and practically carry off the whole of the dead
water, and thereby adding to the more perfect steering of the vessel.
I take and form the fore end of the propeller somewhat similar to the ordinary
form, but reversed on the shaft or boss, and of an increased diameter or area at its
entrance, the area of the blade of the after end being suitably tapered and curved
until it meets the extremity of the boss, so as to permit of the free delivery and yet
undisturbed state of the water for being reacted upon.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Thomas Winter Stark Renouf in the Great Seal Patent Office on the
7th December 1876.
THOMAS WINTER STARK RENOUF, of 2, Canterbury Place, Stopford Road, in the
"IMPROVEMENTS IN
Parish of Saint Helier's, in the Island of Jersey, Gentleman.
SCREW PROPELLERS FOR SHIPS."
By this Invention I propose to employ two or more blades or fans suitably formed
or shaped in the manner hereafter described upon an elongated boss of suitable
length and proportion, and so continued on the after side to such a length with a

page_text: view to materially lessen vibration, and practically carry off the whole of the dead
water, and thereby adding to the more perfect steering of the vessel.
I take and form the fore end of the propeller somewhat similar to the ordinary
form, but reversed on the shaft or boss, and of an increased diameter or area at its
entrance, the area of the blade of the after end being suitably tapered and curved
until it meets the extremity of the boss, so as to permit of the free delivery and yet
undisturbed state of the water for being reacted upon.
DESCRIPTION OF THE DRAWING.
In the accompanying Drawing Figure 1 is a side view; Figure 2, a front view;
and Figure 3, a section of a screw such as I propose to employ, in which A is a
boss of suitable length and proportion fitted in the usual manner; B, the fore end
or leading part of the propeller formed somewhat different to the ordinary form of
propeller, but as will be seen reversed on the shaft or boss, that is to say, of an
increased diameter or area at its entrance; C, the after end of the blade, which is
suitably tapered and curved until it meets the extremity of the boss A, so as to
permit of the free delivery, and thereby undisturbing the state of the water for
being reacted upon by the surface of the rudder as in slutu quo.
Having thus described the nature of my said Invention I wish it to be under-
.stood that I do not confine myself either to the exact length, arca, forin, or propor-
tions as shown in the Drawing annexed, as the same may be varied to suib
various forms of vessels and engines, and may be so modified as to suit the same,
substantially as described.
In witness whereof, I, the said Thomas Winter Starck Renouf, have hereunto
set my hand and seal, this Sixth day of December, in the year of our Lord
One thousand eight hundred and seventy-six.
Witness,
W. ST. LEDGER,
10, Adam Street,
W.C.
THOMAS WINTER STARK RENOUF. (L.S.)