Year: 1888

page_text: Date of Application, 9th Feb., 1888
Complete Left, 17th Apr., 1888
Complete Accepted, 18th May, 1888
I HENRY HARINGTON LEIGH Fel. Inst. P.A., Assoc. M. Inst. C.E. carrying on
business as Phillips and Leigh at No. 22 Southampton Buildings Chancery Lane in
the County of Middlesex Engineer and Patent Agent (a communication to me from
abroad by Joseph Noel Le Solliec of Kerentrech-Lorient in the Department-of
Morbihan in the Republic of France) do hereby declare the nature of this invention
to be as follows :-
This Invention relates to improvements in screw propellers and is intended to
remove the disadvantages incidental to the present methods of construction.
In carrying this Invention into effect I lead a thread spirally around the
shaft, the pitch of the screw so produced being ordinarily equal to its maximoin
diameter The shaft is hollow and the end of it is closed by an air and water
tight plug.

page_text: I, HENRY HARINGTON LEIGH, Fel. Inst. P.A., Assoc. M. Inst. C.E., carrying on
business as Phillips & Leigh at No. 22 Southampton Buildings, Chancery Lane, in
the County of Middlesex, Engineer and Patent Agent, do hereby declare the nature
of this invention, as the same has been communicated to me from abroad, by Joseph
Noel Le Solliec, of Kerentrech-Lorient, in the Department of Morbihan, in the
Republic of France, and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement :—
This invention relates to improvements in screw-propellers, and is intended to
remove the disadvantages incidental to the prosent methods of construction.
Screw propellers, as now made and used, are all characterized by one drawback
inasmuch as the blades have no close connection, the one with the other, in the sense that
a strain upon one would be counteracted by the rigidity of the other. The consequence
is that the blades are very much weakened by their isolation, and their thickness
especially must be increased, which however does not suffice for the prevention of
numerous accidents.
The object of my invention is to construct a screw propeller which shall be free
from the defects of screw propellers as now made, and capable of utilising the
motive power of the engine to better effect.
My invention is represented in the accompanying drawing which is a plan of a
screw made according to my said invention.
In carrying my invention into effect, I lead a continuous thread or web, a, spirally
round a shaft, b, the pitch of the screw so produced being generally equal to the
extreme diameter of the screw. The shaft upon which the screw is mounted is hollow,
and closed at its stern-end by a screw plug adapted to fit therein, air and water-tight,
with the view. of preventing the escape of air from the bore of the shaft, and to
diminish the weight thereof at the moment of immersion.
The shaft upon which the screw is mounted is bolted and keyed to the main shaft
according to any suitable and efficient method.
I wish it to be distinctly understood that I do not confine myself to any particular
dimension for the different parts of my improved screw, inasmuch as they may be
varied according as experience may suggest, or the special circumstances of any
particular case may require.
My invention is not confined to making the shaft, upon which the screw is mounted,

page_text: hollow; as the same may be solid if preferred; and the screw may be mounted upon
the main propeller shaft.
A propeller constructed according to my invention may be made in any
suitable material, such as bronze, copper, steel, cast iron, or any other suitable
5 metal.
Having now particularly described and ascertained the nature of my Buid
invention, and in what manner the same is to be performed, I declare that what I
claim is :-
A screw propeller formed by leading a thread or web spirally round a shaft of
O which it makes the complete circumference the pitch of the screw being variable and
the entire propeller or its several parts made in any suitable material.