Improvements in the Manufacture of Coloured Dioptric and other Lenses.
Year: 1890

page_text: Date of Application, 14th July, 1890
Complete Specification Left, 14th Apr., 1891-Accepted, 16th May, 1591
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Coloured Dioptric and other
Lenses.
I, DUNCAN WEBB of the Manchester Flint Glass Works, Ancoats, Manchester
in the County of Lancaster, Glass Manufacturer, do hereby declare the nature of
this invention to be as follows:-
This invention relates to the manufacture of coloured dioptric and other lenses
such as are used for ship's and other signal lights.
According to these improvements I first make a lining or facing in ruby green
or other coloured glass exactly or approximately to the shape and dimensions of
the inner or outer face of the lens.
The coloured facing or lining is fitted into or upon the mould in which the lens
is to be cast which may then be heated. The molten glass is then poured into the
mould and is pressed rubbed or otherwise manipulated as is well understood, so as
to obtain complete fusion between the coloured facing or lining and the bulk of the
metal of which the lens consists.
Doted this 12th dow of July A D 1890
WILLIAM E. HEYS,
Agent for the Applicant.
COMPLETE SPECIFICATION.
Improvements in the Manufacture of Coloured Dioptric and other
Lenses.
I, DUNCAN WEBB of the Manchester Flint Glass Works, Ancoats, Manchester,
in the County of Lancaster, Glass Manufacturer, 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 the manufacture of coloured dioptric and similar lenses
such as are used for ship's and other signal lights.
According to these improvements I first make a lining or facing in ruby, green,
or other coloured glass exactly or approximately to the shape and dimensions of
the inner face of the lens.
The coloured lining or facing which may be constructed in any suitable manner,
is fitted into or upon or is cast upon the mould in which the lens is to be cast
as hereinafter more fully described, and if not already hot when the lens is to be
cast, it is heated. The molten glass is then poured or placed over the lining in
the mould and is pressed as is well understood, so as to obtain complete fusion and
welding between the coloured facing or lining and the bulk of the metal of which
the lens consists.
I will more particularly describe my said invention with reference to the accom-
panying drawings in each of the figures of which similar parts are indicated by
similar letters of reference.
These drawings represent a dioptric lens and the apparatus employed in moulding
it according to these improvements.
Figure 1 is a perspective view of the dioptric lens ;
Figure 2 a longitudinal section of the top plate of the mould;
Figure 3 a transverse section of the top plate shewn in Figure 2;
Figure 4 a longitudinal section of the lower part of the mould; and,
Figure 5 a cross section of the same part of the mould.

page_text: In Figures 1, 4, and 5, the coloured part of the lens is indicated by the solid
black portion A. This coloured lining is formed of thin glass cut or otherwise
formed to the required size and shape, and placed upon the bed of the mould D,
both the lining and the bed of the mould being heated. Whilst the lining is
still hot I place thereon a sufficient mass of hot metal (as at C Figure 4) to form
the lens and then place upon it the top plate or saddle B of the mould and subject
it to sufficient pressure to compress the hot metal to the form of the lens E.
In proceeding according to these improvements, it will be seen that I do not
employ any special moulds or appliances of any kind whatever, and that I obtain
all my results with the moulds such as are ordinarily employed.
My improvements are not applicable to the manufacture of lenses of all kinds
but only to those which have on the face to which the coloured lining or facing is
applied an arched or concave form. In the manufacture of such lenses, the part
of the mould upon which the coloured lining is placed is convex arched or rounded
and there is no risk of air being trapped and thus producing blisters.
I am fully aware that other and more troublesome and costly methods of uniting
coloured films and facings with lenses have been employed and from time to time
suggested, but none of them so far as I am aware have enabled uniformly thick
films to be produced without special apparatus and appliances, whereas by my
method of procedure, lenses may be manufactured without any special appliance,
free from blisters, and with a perfectly uniform and regular colour.
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 1
claim is:
The manufacture of coloured dioptric and similar lenses, substantially as
and by the means hereinbefore described and as illustrated by the accompanying
drawings.
Dated this 13th day of Anril A D 1891
WILLIAM E. HEYS,
Agent for the Applicant.