Improvements in the Construction of Ship's Port and Starboard Signal Lamps.
Year: 1897

page_text: Date of Application, 29th June, 1897
Complete Specification Left, 29th Apr., 1898-Accepted, 4th June, 1898
Date of Application, 29th June, 1897
Complete Specification Left, 29th Apr., 1898-Accepted, 4th June, 1898
PROVISIONAL SPECIFICATION.
Improvements in the Construction of Ship's Port and Starboard
Signal Lamps.
I, ROBERT THOMAS BLACKBURN, of 185, Brinkburn Avenue, Gateshead, in the
County of Durham, Binnacle Compass Maker and Adjuster, do hereby declare
the nature of this invention to be as follows:-
L
This invention relates to ship's port and starboard signal lamps.
In an ordinary shaped ship's port and starboard signal lamp 1 make the centre
of the horizontal and vertical axes of the inner curvature of the lens
coincide with the centre of the wick or system of wicks, and I make
the edges of the two vertical parts of the lamp frame next the lens
so that in one case a line joining the front frame edge and the lamp
wick inner edge or side is parallel to the keel of the ship when the lamp
is in its position on the ship; in the other case a line joining the edge of the
frame and the after edge or side of the wick is parallel to a line joining the centre
of the burner and a mark two points abaft the beam or in other words parallel to a
line 2210 behind a line at right angles to the keel of the ship when the lamp is in
its position on the ship. The are of light will therefore be equal to ten points of
the compass plus the diameter or breadth of the lamp wick or about eleven points
in all, which are equivalent to 1232°. Dioptic, convex or other lenses may
be used.
Total : 1 T1007
Improvements in the Construction of Ship's Port and Starboard
Signal Lamps.
I, ROBERT THOMAS BLACKBURN, of 185, Brinkburn Avenue, Gateshead, in the
County of Durham, Binnacle Compass Maker and Adjuster, 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:
This invention relates to ship's port and starboard signal lamps.
In an ordinary shaped ship's port or starboard signal lamp I make the axes of
curvature in the horizontal plane of the lens coincide with the centre of the wick or
D
OT

page_text: system of wicks, and I make the edges of the two vertical parts of the lamp frame
next the lens so that in one case a line joining the front frame edge and the lamp
wick inner edge or side is parallel to the keel of the ship when the lamp is in its
position on the ship, in the other case a line joining the edge of the frame and the
after edge or side of the wick is parallel to a line joining the centre of the burner
and a mark two points abaft the beam, or in other words, parallel to a line 221° behind
a line at right angles to the keel of the ship when the lamp is in its position on the
ship. The arc of light will therefore be equal to ten points of the compass plus
the diameter or breadth of the lamp wick or about eleven points in all, which are
equivalent to 12340. Dioptic, convex, or other lenses may be used.
The inner surface of the lens is generally straight in any vertical section.
The annexed drawing shows a horizontal section of a port lamp on a horizontal
plane through the lens, the starboard lamp. will be of the same construction but
reversed: A is the, frame, B the door hinged at B, C the lens, D the oil reservoir,
E the oil filling hole F the wick holder, & the wick preferably cylindrical, H the
handle. for raising the wick, J. the reflector preferably the segment of a sphere
whose centre coincides with centre of flame, K, L, indicates the line parallel to
the keel of the ship when the lamp is in position, K, M, is a line at right angles
to K, L, therefore in line with the beam of the ship, K, N, is a line two points
or 2210 abaft the beam, P, Q, indicate the edges of the vertical parts of the
frame, R, P; is a line parallel to K N and joining the after edge or side of the wick
and the edge P of the frame, R, Q, is a line parallel to K, L, and joining the edge
of the wick and the edge Q of the frame. The are of light is from P' to Q and is
equal to 10 points of the compass the diameter of the wick or about 11 points
in all which is equivalent to 12330. This lamp may also be adapted for electric
.or other light. The materials of which the lamp is constructed and the method of
so constructing it, do not differ from those for similar known lamps and need no
further description.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed I declare that what I
claim is:
1. A starboard or port ship's lamp so constructed that the centre of the wick or
light emitting source is in the axis of the curvature of the lens in the horizontal
plane, the lens-being of such shape and size that the lines P R, R Q; from the side
edges of the flame or light emitting source to the side edges of the effective area of
the lens are directed at angles substantially as herein described.
2. A starboard or port ship's lamp in which the lines R, P; R, Q; drawn as
described herein bear the respective angular relation to each other and to the
longitudinal axis of the ship when the lamp is in position, as herein before set
forth.
Dated this 29th day of April 1898.
HERBERT HADDAN & Co.,
Agents to Applicant.