IMPROVEMENTS IN MACHINERY OR APPA- RATUS FOR PROPELLING VESSELS AND BOATS BY STEAM OR OTHER POWER
Year: 1839

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOHN
COOPE HADDAN, of No. 2, Bazing Place, Waterloo Road, in the County of
Surrey, Civil Engineer, send greeting.
WHEREAS I did by petition humbly represent to Her most Excellent
Majesty Victoria, that I had invented "IMPROVEMENTS IN MACHINERY OR APPA-
RATUS FOR PROPELLING VESSELS AND BOATS BY STEAM OR OTHER POWER," and
Her Majesty, being willing to encourage all useful Inventions, was graciously
pleased to issue Her Royal Letters Patent under the Great Seal of England,
bearing date at London, the Twenty-second day of January, One thousand
eight hundred and thirty-nine, and in the second year of Her reign, by which
Letters Patent Her said Majesty did, for Herself, Her heirs and successors,
give and grant unto me, John Coope Haddan, my exors, adñiors, and assigns,
Her especial licence that I, the said John Coope Haddan, my exors, adiñors,
and assigns, and such others as I or they should agree with (and no others),
might lawfully make, use, exercise, and vend my said Invention, within that
part of Her Majesty's United Kingdom of Great Britain and Ireland called
England, Her Dominion of Wales, and Town of Berwick-upon-Tweed, in such
manner as to me, the said John Coope Haddan, my exors, adñors, or assigns,
should seem meet, and should have and enjoy the whole profit, benefit, com-
modity, and advantage arising from the said Invention during the term of
fourteen years from the date of the said Letters Patent; in which said Letters
Patent there is contained a proviso that I, the said John Coope Haddan,

page_text: should, within six calendar months from the date of the said Letters Patent,
cause a further description of the nature of my said Invention, and the manner
in which the same is to be performed, by an instrument in writing under my
hand and seal, to be inrolled in Her Majesty's High Court of Chancery, as in
and by the same (reference being thereunto had) will more fully and at large
appear.
NOW KNOW YE, that in compliance with the said proviso, I, the said
John Coope Haddan, do hereby declare that the nature of my said Invention,
and the manner in which the same is to be performed, are described and
ascertained in the Drawings hereunto annexed.
My improvements are applicable to that description of machinery for pro-
pelling vessels which is known as the screw, and consist in the formation of
certain openings or spaces in the central portions of the thread or threads of
such screw, whereby the velocity of the impinging or propelling surface is
rendered more equal, and a passage afforded for the water through the entre.
In Figure 1 and Figure 2 of the Drawings hereunto annexed, which are
drawn to a scale of half an inch to a foot, the same letters indicate the same
parts. Figure 1 is an end view, and Figure 2 is either a plan or side elevation
of a screw with two threads, or, technically, a double-threaded screw. A is a
wrought-iron spindle or shaft to which rotary motion is to be given by steam
or other power, by any known and convenient means. B, B, two threads of
wrought iron (which are here drawn at an angle of thirty degrees), with the
'spaces or openings C, C, C, C, cut away, so as to leave the supports or arms
D, D, D, D, and which are keyed to the spindle A by means of the bosses
.E, E, E.
I wish it particularly to be understood, that I do not limit myself to the use
'of a screw with two threads, or to the angle of inclination of such threads, or
to the use of one screw only to each vessel, or to the exact dimensions of the
openings or spaces in such threads, or to the number of parts left for support,
as I have merely described that which I deem best calculated to answer the
purpose intended.
The several parts of the above description which are old and well known
by persons acquainted with this business I disclaim; but I claim as my
Invention the forming and using of screws with openings or spaces in their
threads, as above described, as my "Improvements in the Machinery or Appa-
ratus for Propelling Vessels and Boats by Steam or other Power."
In witness whereof, I have hereunto set my hand and seal, this
Twenty-second day of July, One thousand eight hundred and thirty-
nine.
JOHN COOPE (L.S.) HADDAN.

page_text: AND BE IT REMEMBERED, that on the Twenty-second day of July, in
the year of our Lord 1839, the aforesaid John Coope Haddan came before
our said Lady the Queen in Her Chancery, and acknowledged the Specifi-
cation aforesaid, and all and every thing therein contained and specified, in
form above written. And also the Specification aforesaid was stamped
according to the tenor of the Statute made for that purpose.
Inrolled the Twenty-second day of July, in the year of our Lord One
thousand eight hundred and thirty-nine.