IMPROVEMENTS IN SCREW PROPELLERS
Year: 1856

page_text: LETTERS PATENT to Martin Samuelson, of Scott Street, Hull, for In-
vention of "IMPROVEMENTS IN SCREW PROPELLERS."
13.
Sealed the 29th August 1856, and dated the 4th March 1856.
PROVISIONAL SPECIFICATION left by the said Martin Samuelson at
the Office of the Commissioners of Patents, with his Petition, on the
4th March 1856.
I, MARTIN SAMUELSON, of Scott Street, Hull, do hereby declare the nature.
of the Invention for "IMPROVEMENTS IN SCREW PROPELLERS," to be as follows:-
..:In.the use of screw propellers, ordinarily constructed, it is found that the
portion of the blade near the boss has but a small propelling effect, and carries
a.quantity of water round with the screw, in doing which a considerable amount
of power. is, uselessly expended. Now, I in part obviate this inconvenience by
making an open space through the blade close up to the boss in such manner
that each propelling blade is connected by two arms at a distance from each
other to its nave or boss, in place of mounting each blade of a propeller on a
single arm, as has in some cases before been done.

page_text: ..
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Martin Samuelson in the Great Seal Patent Office on the
3rd September 1856.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, MARTIN
SAMUELSON, of Scott Street, Hull, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Fourth day of March, 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 Martin Samuelson, Her special licence that I, the said Martin
Samuelson, my executors, administrators, and assigns, or such others as I,
the said Martin Samuelson, 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 "IMPROVE-
MENTS IN SCREW PROPELLERS," upon the condition (amongst others) that I, the
said Martin Samuelson, 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 Martin Samuelson, 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:-
In the use of screw propellers, ordinarily constructed, it is found that the
portion of the blade near the boss has but a small propelling effect, and carries
a quantity of water round with the screw, in doing which a considerable amount
of power is uselessly expended. Now, I in part obviate this inconvenience by
making an open space through the blade close up to the boss in such manner
that each propelling blade is connected by two arms at a distance from each
other to its nave or boss, in place of mounting each blade of a propeller on a
single armi, as has in some cases before been done.
Having thus stated the nature of my said Invention, I will proceed more
fully to describe the manner of performing the same.

page_text: Figure 1 shows a propeller consisting of three blades; Figure 2 shows a
plan thereof; Figure 3, a side view thereof; and Figure 4, a vertical section
of one of the blades; and it will be seen that each blade a is connected to its
boss b by two arms c, c, having an open space d between them. The propellers,
when according to my Invention, may have less or more blades than three, as
has heretofore been the case, and the manner of making and the form of the
blades may also, as heretofore, be varied from those shown. Figure 5 shows
a propeller with two blades according to my Invention, each blade consisting
of a frame covered with a plate fixed thereto by rivets; Figure 6 shows a plan
thereof. Figure 7 shows another two-bladed propeller; and Figure 8, a section
of one of the blades, which consists of a frame covered with a plate fixed by
rivets. In each of these cases the blades are each connected to its boss by two
arms c, c.
Having thus described the nature of my said Invention, and the manner of
performing the same, I would have it understood that what I claim is, the
making an open space through the blades of a propeller where the same is
connected to the boss, whereby each of the blades of a propeller is caused to
be carried by two arms, as described.
In witness whereof, I, the said Martin Samuelson, have hereunto set my
hand and seal, this First day of September, in the year of our Lord
One thousand eight hundred and fifty-six.
Witness,
JOHN THELWALL,
Hull.
MARTIN SAMUELSON. (L.S.)