IMPROVEMENTS IN PADDLE WHEELS FOR PROPELLING VESSELS
Year: 1856

page_text: LETTERS PATENT to Caleb Perry Sharpley, of Berry's Cottage, Chapel
Street, Stockwell, Surrey, for the Invention of "IMPROVEMENTS IN PADDLE
WHEELS FOR PROPELLING VESSELS."
登
PROVISIONAL SPECIFICATION left by the said Caleb Perry Sharpley at
the Office of the Commissioners of Patents, with his Petition, on the.
18th June 1856.
I, CALEB PERRY SHARPLEY, of Berry's Cottage, Chapel St., Stockwell,
Surrey, London, do hereby declare the nature of the said Invention for "IM-
PROVEMENTS IN PADDLE WHEELS FOR PROPELLING VESSELS," to be as follows:
My Invention consists of the application of a screw paddle wheel to vessels,
by which screw form of paddle wheel I expect to gain a considerable increase
of speed for all vessels fitted with it.
I do not confine myself to any specific form for such paddle wheel, as the
same effect may be produced with its form modified in various ways; but I:
claim the universal application of a paddle. wheel made in form of a screw
for the purpose of propelling vessels.

page_text: SPECIFICATION in pursuance of the conditions. of the Letters Patent, filed
by the said Caleb Perry Sharpley in the Great Seal Patent Office on the
17th December 1856.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, CALEB
PERRY SHARPLEY, of Berry's Cottage, 13, Chapel Street, Stockwell, Surrey,
send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Eighteenth day of June, in the year of our Lord One
thousand eight hundred and fifty-six, in the nineteenth year of Her reign,
did, for Herself, Her heirs and successors, give and grant unto me, the said
Caleb Perry Sharpley, Her special licence that I, the said Caleb Perry
Sharpley, my executors, administrators, and assigns, or such others as I, the
said Caleb Perry Sharpley, my executors, administrators, and assigns, should at
any time agree with, and no others, from time to time and at all times there-
after 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 "IMPROVEMENTS IN
PADDLE WHEELS FOR PROPELLING VESSELS," upon the condition (amongst others)
that I, the said Caleb Perry Sharpley, 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 Caleb Perry Sharpley, do hereby declare
the nature of my said Invention, and in what manner the same is to be per-
formed; to be particularly described and ascertained in and by the following
statement:-
My Invention consists of the application of a screw paddle wheel to vessels,
by which screw form of paddle wheel I expect to gain a considerable increase
of speed for all vessels fitted with it.
I do not confine myself to any particular form or inclination of screw for such
screw paddle wheel, as the same effect may be produced, with its form or incli-:
nation modified in various ways; but I claim the universal use and application"
to vessels of a paddle wheel or paddle wheels-made in the form of a. screw, for
the purpose of giving increased speed to vessels, as herein set forth. The
mode in which I customarily construct such paddle wheels is as follows:-
In place of using a series of floats set in a wheel-shaped frame, I substitute

page_text: for such floats a continuous annular spiral paddle, and fix it to the wheel-shaped
frame in such a way that the plate or board forming such screw or spiral paddle
shall enter and leave the water edge first, so as to receive the least possible
resistance form the water, and thereby to lessen the trembling motion occa-
sioned by such resistance of the water to paddle wheels as ordinarily constructed,
and so as to enable the backwater to leave the paddle readily as the blade of
the screw rises from it. A material advantage afforded by this continuous
spiral form of paddle wheel consists in the great strength which such form
gives it, an advantage which to ocean steamers is scarcely second in im-
portance to the increased speed which may be obtained by its use. Another
advantage is, that the spiral paddle can be readily and cheaply applied to old
frames, while its simplicity and strength free it from liability to derangement
or injury.
The foregoing description particularly describes and ascertains the nature of
my Invention.
In witness whereof, I, the said Caleb Perry Sharpley, have hereunto set
my hand and seal, this Sixteenth day of December, in the year of our
Lord One thousand eight hundred and fifty-six.
CALEB PERRY SHARPLEY. (L.S.)