Improvements in Lenticular Glasses of Lamps for Signalling and other Purposes on Ships and in other Situations.
Year: 1888

page_text: Improvements in Lenticular Glasses of Lamps for Signalling and
other Purposes on Ships and in other Situations.
I, WILLIAM BISHOP, of 52 Clyde Place, Glasgow, in the County of Lanark, North
Britain, Ship-furnishing 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, that is to say :-
My said Invention has for its object by the adoption of improved forms of lenticular
glasses to modify the distribution of the light of lamps used for signalling and other
purposes on ships or in other situations so as to obtain an increase in the light
transmitted in certain directions.
In carrying out my Invention according to one modification I take a lenticular
glass of a form already in use and which is in the shape of the arc of a circle in
horizontal section, and in vertical section has its middle part externally convex, with
its upper and lower parts each formed with one or more angular or prism-like pro-
jections. Such a glass is ordinarily made with its inner side cylindrical but by my
Invention I combine with it one or more vertical pieces of glass each made with a
convex outer surface to fit or nearly fit the inner concave cylindrical surface of the
main glass, and with its inner surface flat or of a convex form or the form may in
section be that of a meniscus lens. Instead of the added part or parts being separate
the main lamp glass may be moulded or otherwise shaped so as to have the same
effect, that is, with its inner surface shaped with flat parts or inwardly convex parts
or with concave parts of larger radius than that which the internal surface would
have if of the ordinary cylindrical form.
The improved lamp glasses may be made in various sizes and each glass may be
made to extend more or less round a circle, whilst for some purposes as for example
in the case of mast-head lights two or more pieces may be combined.
And in order that my said Invention and the manner of performing the same may
be properly understood I hereunto append a sheet of explanatory drawings to be
hereinafter referred to and showing two simple modifications of my improvements.
Figures, 1, and 2, on the accompanying sheet of drawings are horizontal and
vertical sections respectively of one modification of my improvements, figures, 3,
and 4, being similar views of a second modification.
In the modification shown in figures, 1, and 2, the lenticular glass, 5, which is of
the ordinary construction herein before described, has combined with it three vertical
pieces of glass, 6, 7, 8, each made with a convex outer surface to fit the inner concave
cylindrical surface of the main glass, 5, and each with its inner surface flat.
The same effect is produced according to the modification shown in figures, 3,
and 4, by moulding or otherwise shaping the main glass, 5, with its inner surface
formed with three flat parts, 9, 10, 11, instead of adding separate parts, (6, 7, 8,)
as in the modification hereinbefore described.

page_text: Date of Application, 9th Apr., 1888
Complete Specification Left, 5th Jan., 1889
Complete Specification Accepted, 5th Feb., 1889
Improvements in Lenticular Glasses of Lamps for Signalling and
other Purposes on Ships and in other Situations.
I, WILLIAM BISHOP, of 52 Clyde Place, Glasgow, in the County of Lanark,
North Britain, Ship-furnishing Ironmonger, do hereby declare the nature of
this Invention to be as follows, that is to say:―
My said Invention has for its object by the adoption of improved forms of lenticular
glasses to modify the distribution of the light of lamps used for signalling and other
purposes on ships or in other situations so as to obtain an increase in the light
transmitted in certain directions.
In carrying out my Invention according to one modification I take a lonticular
glass of a form already in use and which is in the shape of the arc of a circle in
horizontal section, and in vertical section has its middle part externally convex, with
its upper and lower parts each formed with one or more angular or prism-like pro-
jections. Such a glass is ordinarily made with its inner side cylindrical but by my
Invention I combine with it one or more vertical pieces of glass each made with a
convex outer surface to fit or nearly fit the inner concave cylindrical surface of the
main glass, and with its inner surface flat or of a convex form; or the form
may in section be that of a meniscus lens. Instead of the added part or parts being
separate the main lamp glass may be moulded or otherwise shaped so as to have the
same effect, that is, with its inner surface shaped with flat parts or inwardly convex
parts or with concave parts of larger radius than that which the interual surface would
have if of the ordinary cylindrical form.
The improved lamp glasses may be made in various sizes and each glass may be
made to extend more or less round a circle, whilst for some purposes as for example
in the case of mast-head lights, two or more pieces may be combined.
•7 1000
EDMUND HUNT,
Applicant's Agent."

page_text: 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 :-
Making lenticular glasses of lamps so as to obtain an increase in the light
transmitted in certain directions by combining each main glass with separate suitably
shaped parts or by suitably shaping each main glass as a whole in the improved
manner substantially as hereinbefore described.
EDMUND HUNT,
Applicant's Agent.