Improvements in Reflectors.
Year: 1889

page_text: Date of Application, 3rd Sept., 1889
Complete Specification Left, 29th May, 1890-Accepted, 12th July, 1890
PROVISIONAL SPECIFICATION.
Improvements in Reflectors.
I, ADAM CYRUS ENGERT, of Three Mills Lane, Bromley by Bow, in the County of
Middlesex, Engineer, do hereby declare the nature of this invention to be as
follows:-
According to this invention I construct a reflector of a number of pyramids with
their axes radial to the source of light and with their apices pointing towards it.
Preferably the bases of these pyramids entirely cover the surface of the reflector,
their edges touching one another. The pyramids may be of the same size, but pre-
ferably I graduate them in rings. In the case of a spherical reflector the pyramids
in the ring nearest to the point above the light are the smallest, those in the next
ring being larger and so on. The pyramids may either be solid or hollow and if of
glass may be silvered or otherwise coated at the back. The reflector may also with
great advantage be made in pottery ware and all in one piece with the pyramids
upon it. Such a reflector may be made with an enamel surface.
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COMPLETE SPECIFICATION.
Improvements in Reflectors.
I, ADAM CYRUS ENGERT, of Three Mills Lane, Bromley by Bow, in the County of
Middlesex, Engineer, 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 :-
According to this invention I construct a reflector of a number of pyramids with
their axes radial to the source of light and with their apices pointing to wards it.
Preferably the bases of these pyramids entirely cover the surface of the reflector,
their edges touching one another. The pyramids may be of the same size, but pre-
ferably I graduate them in rings. In the case of a spherical reflector the pyramids
in the ring nearest to the point above the light are the smallest, those in the next
ring being larger and so on. The pyramids may either be solid or hollow and if of
glass may be silvered or otherwise coated at the back. The reflector may also with
great advantage be made in pottery ware and all in one piece with the pyramids upon
it. Such a reflector may be made with an enamel surface.
In order that my said invention may be fully understood and readily carried into
effect I will proceed to describe the drawings hereunto annexed.
Figure 1 is a vertical section of a reflector constructed in accordance with my
invention; the form shown is especially suitable for production in pottery ware; it may
be white or colored throughout or it may be enamelled on the surface
surfaces.
Figure 2 is an underside view of this reflector.
or
This reflector it will be seen is of hemispherical form. It is intended that a gas
burner should be placed at or just below the centre of the hemisphere. The whole
under surface of the reflector is covered with pyramidal projections and the axes of
all of these are radial and are directed to the source of light.
There is an aperture at the top of the reflector to allow the escape of products of
combustion and a pipe should be provided to conduct them away. The apparatus so
used aids in the ventilation of the apartment in which it is placed.
Where the

page_text: reflector is used with incandescent electric lamps this opening will not be required
and the same is the case when the reflector is employed to throw a beam of light
horizontally.
When gas is the illuminant employed I in some cases conduct the gas pipe around
the burner at the centre of the reflector so that it may become heated and be supplied
to the burner in a heated state.
These reflectors whilst directing downwards the portion of light which otherwise
would be uselessly expended above diffuse it in such a manner that no shadow is
thrown.
Reflectors in accordance with my invention may very suitably be made in pressed
glass and they may or may not be silvered either externally or internally.
These reflectors may also be stamped or raised in sheet metal.
In some cases I make these reflectors of elliptical in place of circular form and
when they are of large size I prefer to build them up in several pieces as this is more
convenient than to produce them in a single piece.
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 I
claim is
A reflector substantially as described with an inner surface composed of numerous
pyramidal projections, the axes of which are approximately radial to the source of
light.