Improvements in Propellers for Ships and other Vessels.
Year: 1899

page_text: PROVISIONAL SPECIFICATION.
Improvements in Propellers for Ships and other Vessels.
I, DANIEL GEORGE MARTENS, of Christiania, Norway, at present residing at 7,
Montague Street, Russell Square, in the County of London, Engineer, do hereby
declare the nature of this invention to be as follows: -
With screw propellers fixed on a rotary shaft as ordinarily constructed, the
water is thrown to the side at the same time that the propeller is advancing
through the water and this lateral displacement of the water increases with the
number of revolutions of the propeller per minute and results in a considerable
loss of the propulsive power.
The object of this invention is to construct propellers by which the lateral
displacement of the water is prevented.
To effect my object I form upon or secure to the interior of a cylinder or tube
a propeller thread or threads of any suitable pitch and dimensions. This
cylinder or tube which may be of any suitable length, I mount on ball bearings
and provide means, preferably by chains and sprocket wheels, for rotating it.
Dated this 30th day of May 1899.
F. W. GOLBY,
36, Chancery Lane, London, W.C.,
Patent Agent for the Applicant.
I, DANIEL GEORGE MARTENS, of Christiania, Norway, at present residing at 12,
Montague Place, Russell Square, in the County of London, Engineer, do hereby
declare the nature of this invention and in what manner the same is to be per-
formed to be particularly described and ascertained in and by the following
statement:-
With screw propellers fixed on a rotary shaft as ordinarily constructed, the
water is thrown to the side at the same time that the propeller is advancing
through the water and this lateral displacement of the water increases with the
[Price 77

page_text: number of revolutions of the propeller per minute and results in a considerable
loss of the propulsive power.
The object of this invention is to construct propellers by which the lateral
displacement of the water is prevented.
To effect my object I form upon or secure to the interior of a cylinder or tube
a propeller thread or threads of any suitable pitch and dimensions. This
cylinder or tube which may be of any suitable length, I mount on ball bearings
and provide means, preferably by chains and sprocket wheels, for rotating it.
In the accompanying drawings Fig. 1 is a longitudinal section and Fig. 2 is
a transverse section taken on the line 2-2 of Fig. 1, showing one way in which
my invention may be carried into practical effect. The same parts are lettered
to correspond in the two figures.
A is the cylinder or tube of any suitable length and diameter having a propeller
blade or propeller blades B secured to, cast on, or otherwise formed integrally
with the interior of the said cylinder or tube. The propeller blade or blades 13
may be of any suitable pitch and dimensions and is or are secured only at the
outer periphery to the cylinder or tube A, the inner end or ends or roots of
the blades being free, thus affording a central passage or way through the interior
of the cylinder or tube A, as shown in the drawings.
The cylinder or tube A is mounted on ball bearings, and in the example shown
is fitted with a sprocket wheel C whereby it may be rotated by a chain passing
through the way d in the outer tube D. The propeller cylinder or tube A is
provided with end flanges a having circular grooves therein to act as races for
the balls E. The other part of each ball race is formed in a block F, which blocks,
are secured in proper position by flanges 9 on end tubes G which are screwed
or otherwise rigidly secured to the ends of the outer tube D. This outer tube D
is provided with interior flanges which abut on the interior of the circular
flanges a on the propeller cylinder or tube A and make a joint therewith. Rings
or washers or other packing may be interposed between any of the parts to make
a water tight joint if desired.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is:-
(1) A propeller for ships and other vessels consisting of a cylinder or tube
and a propeller blade or blades secured at the outer end or ends to or formed
on the interior of said cylinder or tube.
(2) A propeller for ships and other vessels consisting of a cylinder or tube
mounted in suitable bearings, a propeller blade or blades secured to or formed
on the interior of said cylinder or tube, and means for rotating the said cylinder
or tube in its bearings, substantially as described.
(3) A propeller for ships and other vessels consisting of a cylinder or tube
mounted on ball bearings in an outer tube, a propeller blade or blades secured to
or formed on the interior of said cylinder or tube, and means for rotating the
said cylinder or tube on the ball bearings within the outer tube, substantially
as described.
(4) A propeller for ships and other vessels consisting of a cylinder or tube
mounted in suitable bearings, a propeller blade or blades secured to or formed
on the interior of said cylinder or tube, and means secured to the exterior of said
cylinder or tube for rotating it in its bearings, substantially as described.
(5) A propeller for ships and other vessels consisting of a cylinder or tube
mounted on ball bearings in an outer tube, a propeller blade of blades secured
to or formed on the interior of said cylinder or tube, and means secured to the
exterior of said cylinder or tube for rotating it on the ball bearings within the outer
tube, substantially as described.
(6) A propeller for ships and other vessels consisting of a cylinder or tube
mounted on ball bearings in an outer tube, a propeller blade or blades secured

page_text: to or formed on the interior of said cylinder or tube, a sprocket or toothed wheel fast
on the exterior of said cylinder or tube for rotating it on the ball bearings within
the outer tube, substantially as described.
F. W. GOLBY,
Patent Agent, 36, Chancery Lane, London, W.C.,
Agent for the Applicant.