Improvements in Ships' Light Screens.
Year: 1891

page_text: COMPLETE SPECIFICATION.
Improvements in Ships' Light Screens.
I TÖNNES ANDREASEN of 274 George Street, Cardiff, in the County of
Glamorgan, Ship's Store Merchant and Ironmonger do hereby declare the nature
of this 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 this invention is to produce a light screen that shall maintain the
side light supported by it in a vertical position notwithstanding the rolling motion
of the ship.
In carrying this invention into effect I mount the light screen on trunnions
working in bearings supported on tubular stanchions fitted over the solid stanchions
to enable the light screen to swing in or out as required.
At the underside of the light screen I attach a box instead of a single weight
this box being loaded with lead, sand, or any other suitable material. By this
means the pressure of the wind upon the surface of the box balances that upon the
surface of the light screen, which is thereby maintained in a vertical position.
A screwed stud projecting from one end of the light screen travels along the
surface of a quadrant piece projecting from one of the stanchions, as the light screen
oscillates with the rolling of the ship. This stud is provided with a screw nut which
may be tightened against the sector when it is required to secure the light screen
in position to prevent the wear of the trunnions, as in the case of rough weather in
the day time when the light is not required.
And in order that my invention may be more fully understood and carried into
practice I will now proceed to describe the same with reference to the accompanying
sheet of drawings forming part of this Specification.
The light screen a is provided with trunnions or pivots 6 working in bearings c
carried by hollow stanchions d and supported on solid stanchions d' and working on
a flange. The box e is attached to the underside of the light screen a and contains
lead, sand, or any other suitable material as may be necessary to balance and
maintain the side light fin a vertical position so that it may project a horizontal
beam of light notwithstanding the rolling of the ship. The object of fitting the
box e underneath the proper light screen a is in order that the pressure of the wind
on the surface of the latter may counterbalance that on the surface of the light
screen a and thereby prevent the rocking of the screen independently of the motion
of the ship. To one of the stanchions d is connected a quadrant shaped piece g and
from the corresponding end of the light screen a projects a screwed stud on which
works a nut or hand wheel j. When it is desired to lock the light screen in position
to prevent the wear on the trunnions the said nut or wheelj is tightened against the
quadrant piece g so as to prevent the movement of the stud h over its surface.
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
1 claim is :-
1. Mounting ship's side lights on tubular stanchions d fitted to the solid
stanchions d' having flange bearings, and also upon trunnions to enable the light
screen to be maintained in a vertical plane notwithstanding the rolling of the ship.
2. A ship's light screen having a box underneath containing lead, sand, or any
other suitable materials in order that the pressure of the wind on the surface of the

page_text: box may counterbalance that on the surface of the light screen substantially as
described and illustrated.
1001
66
CASTLE SMITH,
Invention” Office, 54, Fleet Street, London, E.C.,
Agent for the Applicant.