IMPROVEMENTS IN LENSES FOR PAVEMENT REFLECTORS DECK-LIGHTS AND OTHER LIKE USES to be as follows
Year: 1884

page_text: I ROBERT WILSON of 49 Kellet Road, Brixton, in the county of Surrey,
Manufacturers' Agent do hereby declare the nature of my said invention for
“IMPROVEMENTS IN LENSES FOR PAVEMENT REFLECTORS DECK-LIGHTS AND OTHER
LIKE USES to be as follows:-
"J
This invention relates to the class of lens reflectors commonly employed* for
diffusing light within areas or below street levels or between decks of steam vessels,
ships, and other like applications and the invention consists of an improved. form
and construction of lens or lenses which receive, divert, project, and diffuse light
at angles to the rays received.
It is well known that in practice the convex and prismatic lenses hitherto
employed for lighting areas and other like uses the rays of light are as a matter of
fact not projected in the manner claimed for them, neither can they be so directed
such effect being contrary to all optical laws.
According to this my invention I employ concave lenses either semi-plano
concave or double concave lenses. Where the light is required to be transmitted in.
opposite directions as in corridors then the double concave lens is used but where
the light is to be projected one way only then the semi-plano concave lens is to
be used.
The reflecting face of my improved lens is concave horizontally and vertically
forming a semi-spherical reflector, by means of which the light is reflected so as to
fill the whole of an angle of 90 degrees thus illuminating a basement from the
ceiling to the floor, and not as in the case of a prism simply throwing the light at
an acute angle
The ray receiving surface and outline of parts (other than the concave face)
will be of form according to position and design of the supporting and carrying
frame.

page_text: I ROBERT WILSON of 49 Kellet Road, Brixton, in the County of Surrey,
Manufacturers Agent do hereby declare the nature of my said invention for
IMPROVEMENTS IN LENSES FOR PAVEMENT REFLECTORS, DECK LIGHTS, AND OTHER
LIKE USES" and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement, aided by the annexed
drawings:-
"
This invention relates, to the class of lens reflectors, commonly employed for
diffusing light, within areas, or below street level, or between decks of steam vessels,
ships, and other like applications, and the invention consists, of an improved form
and construction of lens, or lenses, which receive, divert, project, and diffuse, light
at angles to the rays received.
According to, this my invention, I employ concave lenses, either semi-plano
concave, or double concave lenses, where the light is required to be transmitted-in
opposite direction as in corridors, then the double concave lens is used, but where
the light is to be projected one way only, then, the semi-plano concave lens is to,
be used.
Such being the nature and object of my said invention, the following is a
complete description of same, reference being had, to the accompanying drawings,
forming a part of this specification, in which :-
Fig. 1 is an end elevation of my improved lens.
Fig. 2 is a plan view of the lens.
Fig. 3 is a vertical section through the line A. B. of Fig. 2.
Fig. 4 is a section on line C. D of Fig. 5 which is an end elevation of duplex
lens, according to this my invention.
Fig. 6 shews the old form of prismatic lens.
At 1 is the front of the lens, forming a flat even surface, 2 is the face which it
will be seen is concave, not only vertically as shewn at 3, but also horizontally as
shewn at 4 (Fig. 2) the concavity horizontally gradually decreasing from points 6
to 7. At 5 is a shoulder or rabbet, formed around the lens, for the purpose of
securing the same in its holding frame, as will be understood.
Referring to Fig. 6 which illustrates a prismatic, or semi-prismatic lens, as now
commonly used for reflectors-it will be seen that my improved lens, is altogether
different therefrom, in construction, form, and configuration, and that in the prior
construction, the back 8 of the lens formed one angle-only, and consequently the
rays of light were reflected at one common and acute angle only, whereas in my
improved concave lens, having a convex reflecting face, the latter is equivalent to,.
and operates as a convex mirror or as numerous angles or facits, and diffuses rays
of light in various directions, as shewn by arrows see Fig. 3.
Having thus fully described, the nature and particulars, of this my said invention,
and in what manner the same is to be performed, and distinguished between what
is old, and not claimed-I declare that what I claim is :-
The improved lens, for purposes referred to, and as herein fully described and
illustrated by the drawings annexed.
Dated this 29th day of October 1884.