Year: 1887

page_text: Date of Application, 12th May, 1887
Complete Left, 12th Mar., 1888
Complete Accepted, 13th Apr, 1888
We FREDERICK CARRINGTON PHILLIPS of 2 Victoria Mansions Westminster in
the county of Middlesex Electrical Engineer and HUGH ERAT HARRISON of the same
address Electrical Engineer do hereby declare the nature of this invention to be as
follows:-
This invention relates to reflectors or projectors of light and particularly to those that
are used with Electric or other powerful lights and where it is desirable or necessary that
he reflecting surfaces and the sourse of light should not be too near to one another.
According to this invention a parabolic or approximately parabolic or other reflector
is combined with a sperical or approximately spherical reflector so that the focus of
the parabolic or first mentioned reflector and the centre of the sperical or approxi-
mately sperical reflector are approximately coincident, the sperical reflector taking
the place of that part of the first mentioned reflector, where a parabolic reflector is
used that lies between its vertex and a plane passing through its focus and
perpendicular to its axis which is the part that would be too near to the sourse of
light.
The object of the spherical reflector is to reverse the direction of the rays of light that
fall upon it so that they may fall upon the parabolic or other reflector as though they
proceeded from the sourse of light direct.
A lens is placed in front of the sourse of light to give the necessary direction to
those rays that would not otherwise be given the proper direction.
F. C. PHILLIPS.
HUGH ERAT HARRISON.

page_text: COMPLETE SPECIFICATION.
Improvements in Reflectors or Projectors of Light from an Artificial
Source.
We FREDERICK CARRINGTON PHILLIPS of 2 Victoria Mansions Westminster in
the county of Middlesex Electrical Engineer and HUGH ERAT HARRISON of the same
address Electrical Engineer do hereby declare the nature of this invention and in
what nanner the same is to be performed, to be particularly described and ascertained
in and by the following statement :-
This invention relates to reflectors or projectors of light and particularly to those
that are used with Electric or other powerful lights and where it is desirable or
necessary that the reflecting surfaces and the source of light should not be too near to
one another. According to this invention a parabolic or approximately parabolic or other
reflector is combined with a spherical or approximately spherical reflector so that the focus
of the parabolic or first mentioned reflector and the centre of the spherical or approxi-
mately spherical reflector are approximately coincident the spherical reflector taking the
place of that part of the first mentioned reflector, where a parabolic reflector is used,
that lies between its vertex and a plane passing through its focus and perpendicular
to its axis which is the part that would be too near to the source of light.
The object of the spherical reflector is to reverse the direction of the rays of light
that fall upon it so that they may fall upon the parabolic or other reflector as though
they proceeded from the source of light direct.
Å lens is placed in front of the source of light to give the necessary direction to
those rays that would not otherwise be given the proper direction.
Having thus described the nature of our invention we will proceed to describe more
fully the manner of performing the same..
A B C D is a vertical section of the parabolic or approximately parabolic portion of
the reflector, passing through the focus F. B C is the section of the plane passing
through F and perpendicular to the axis P Q. BQC is the spherical portion of the
reflector.
MN is a lens whose position is determined by the points M & N formed by the
intersections of the lines A E and D G drawn from the edge of the reflector through
the focus, with the lines X B and Y C drawn parallel to the axis PQ to the
points B & C where the spherical portion of the reflector meets the parabolic portion.
The lens thus directs all rays within the double cone A D F GE that would otherwise
pass out of the reflector undeflected by the parabolic portion.
If the rays are required to pass out of the reflector at a given angle the
portion A B C D of the reflector is made hyperbolic or approximately hyperbolic.
The source of light is placed at the focus F.

page_text: The paraboloid or hyperboloid A, B, C, D, need not be one of revolution, i.e., the
form of the reflecting surface in a section through any portion of the reflectors in a
plane at right angles to the axis P, Q, need not necessarily in all cases be
circular.
Having now particularly described and ascertained the nature of this invention,
and in what manner the same is to be performed, we declare that what we
claim is :-
:-
The relative arrangement and use substantially as hereinabove described of two
reflectors and a lens, the reflecting surfaces of the said reflectors having, in a section
thercof taken in some plano common to the two reflectors, respectively a parabolic or
approximately parabolic or a hyperbolic form, and the form of an arc of a circle or
approximately so, for the purpose mentioned.
Dated this Twelfth day of March 1888.
FREDERICK CARRINGTON PHILLIPS.
HUGH ERAT HARRISON.
W. Lloyd Wise,
46, Lincoln's Inn Fields, London, W.C.,
Agent for the Applicant.