Improvements in the Construction of Navigable Vessels and in the Method of Propelling the same.
Year: 1890

page_text: Date of Application, 17th Nov., 1890
Complete Specification Left, 18th Mar., 1891-Accepted, 18th Apr., 1891
PROVISIONAL SPECIFICATION.
Improvements in the Construction of Navigable Vessels and in the
Method of Propelling the same.
I, WALTER BRANDRETH BROMLEY, of Crofton House, Lampton Road,
Hounslow, in the County of Middlesex, Civil Engineer, do hereby declare the
nature of my said invention to be as follows:-
The object of my invention is to effect improvements in the construction of
navigable vessels, and in the method of fitting and propelling the same by means of
twin screws.
In constructing my improved vessels, I form the fore part of the immersed portion
with a rising floor, both longitudinally and transversely, the draught being small at
the stem. The transverse sections forward are of a hollow V form, to accommodate
and make room for the twin screws, which are fitted forward, one on each side of
the bow, between the greatest breadth of beam. and the stem of the vessel.
The shafts to which the screws are fitted pass through suitable stuffing boxes fitted
to the hull. The outer ends of the screw shafts are supported by knife-edged
frames attached to the hull.
The lines of the hull are designed to suit the backward flow of the water, so that
it may clear the sides as rapidly, and with as little friction as possible. The after
part of the vessel is preferably constructed with finer lines than the fore part, and
the draught amidships and aft is so arranged that the screws are entirely above
ground when the vessel is resting on its keel. For this purpose either a deep
central keel may be used, or two bilge keels may be fitted, as preferred.
Dated 17th November 1890.
GEO.
DOWNING,
8, Quality Court, London, W.C., Agent for Applicant.
COMPLETE SPECIFICATION.
Improvements in the Construction of Navigable Vessels and in the
Method of Propelling the same.
I, WALTER BRANDRETH BROMLEY, of Crofton House, Lampton Road,
Hounslow, in the County of Middlesex, Civil Engineer, do hereby declare the
nature of my said invention, and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement :-
The object of my invention is to effect improvements in the construction of
navigable vessels, and in the method of fitting and propelling the same by means of
twin screws.
In constructing my improved vessels, I form the transverse sections of the fore
body greater than those of the after body, to make room for the engines, which are
fitted so as to drive the screw shafts by direct action.
Two screws are fitted, one on each side of the vessel, preferably at or forward of
the midship section. The screw shafts are parallel to the longitudinal axis of the
vessel, and are supported by suitable bearings fitted to the sides, with or without
outer bearings, as required.
The lines of the hull are designed to suit the flow of the water, so that it may
flow to and from the screw propellers with as much freedom, and as little friction as
possible. The hull is made to overhang the propellers at the sides sufficiently to
cover and protect them.
The screws may be fitted fore or aft of the engines, preferably aft. The screws
are entirely submerged, and placed deep down in the water.

page_text: Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1. The improved construction of navigable vessels, in which provision is made
for placing a submerged screw propeller on each side of and at or near the centre 5
of the hull, substantially as herein before described.
2. The improved method of propelling vessels by means of submerged screw
propellers, driven by direct acting engines, substantially as herein before described.
3. The general construction, arrangement, and combination of the several
and respective parts, together forming my invention of improvements in the con- 1
struction of navigable vessels, and in the method of propelling the same, substantially
as herein before described.
Date L 1001
AT TAIMYA SAAT SAM
GEO. DOWNING,
8, Quality Court, London, W.C., Agent for Applicant.