Year: 1896

page_text: I, ROBERT BRIDGES MOLESWORTH, of 34, Victoria Street London, S.W.
Civil Engineer do hereby declare the nature of this invention to be as follows:-
The combination of an electric search-light with a dispersion reflector-either
concave or convex, and cylindrical or spherical-of sheet metal or other suitable
material, so arranged in front of the said search-light as to reflect a divergent
beam of light, or a beam of light divergent in any one plane.
The combination,-in conjunction with an electric search-light, and in front of
the same, of a dispersion reflector, of light sheet steel or other suitable material,
with a means of varying the curvature of the said reflector at the will of the
operator so as to throw a beam of light which can be made to converge or diverge
as required. This variation of curvature may be effected either by applying
pressure or tension to the centre or other portions of the reflector, or by stresses
on the edges of the reflector, or by other suitable means. The reflector may be
either cylindrical or spherical as required to suit special cases.
Deted this Wifth day of March 1806
R. BRIDGES MOLESWORTH.
Starch
I ROBERT BRIDGES MOLESWORTH of 34 Victoria Street Westminster, in the
County of London, Civil 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 :-
I. The combination of an electric search light, with a dispersion reflector, either
concave or convex, and spherical or cylindrical, formed of thin sheet metal, or
other suitable material so arranged in front of the said search light as to reflect
a divergent beam of light, or a beam of light divergent in any one plane. This
reflector is not intended to replace the parabolic reflector of the search light, but
to be used in conjunction with the same in order to illuminate a larger area than
would be the case if the search light were used alone, or with a plane mirror.
Fig. 1 shews such a combination of dispersion reflector and search light.
A is the search light, fixed on a light frame F F, with a suitable pivot mounting
at C to permit of the necessary training and directing of the light. The dispersion
reflector is shewn at B, and in this case is convex and spherical in form. The
incident beam of light is indicated at D, and the reflected beam at E, which in this
case will illuminate a wide area both vertically and horizontally.
II. The combination-in conjunction with an electric search light, and in front
of the same-of a dispersion reflector of light sheet metal or other suitable material,

page_text: as above described, with a means of varying the curvature of the said reflector at
the will of the operator, so as to throw a beam of light which can be made to
converge or diverge as required and thus illumine more brilliantly a smaller area,
or less brilliantly a larger area as may be desired.. This variation of curvature
may be effected either by applying pressure or tension to the centre or other
portions of the reflector, or by stresses on its edges, or by other suitable means.
The reflector may be cylindrical or spherical as required to suit special cases.
Fig. 2 is a vertical section through the centre of such a dispersion reflector, and
shews in detail one méthod of varying the curvature. The general arrangement
of search light, dispersion reflector and frame is similar to that shewn in Fig. 1.
B is the dispersion reflector and in this case is cylindrical and concave in form;
FF is the light frame carrying the search light and the reflector B; G is a lever
pivoted to the frame at its upper end, and connected to the centre of the reflector
by means of the pillar H, while at its lower end it is jointed to the screwed
sleeve L. K is a rod fitted with a handle near the lower end of the frame to
-enable it to be conveniently turned, and screwed at its upper end to fit the
sleeve L. M is a double thrust collar on K to enable tension or compression to
be put on the centre of the reflector B through the medium of the screwed sleeve L,
the lever G, and the pillar H, by turning the rod K. The sides of the reflector
are held along the frame F, and by turning the rod K, the centre of the
reflector B is advanced or withdrawn, thus varying the curvature of the said
reflector. Any other suitable method of achieving this variation may be adopted,
and the reflector B may be made convex in place of concave; but inasmuch as the
beam of light from a search light is slightly divergent the concave dispersiou
reflector is preferable as it enables any amount of convergence of the beam to be
obtained before the dispersion reflector becomes quite flat, and the metal sheet, or
other material, formning the reflector retains its shape better.
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 :-
1. A simple means of enabling a search light to be used to illumine wider or
larger areas, as is desirable when searching comparatively close up to the search
light.
II. A simple means of enabling a search light to be used to illuminate large
areas with a comparatively feeble light, while at the same time retaining the
power, when so required, of concentrating the light, and thus strongly illuminating
any particular point or area.
Dated this 2nd day of December 1896.
R. BRIDGES MOLESWORTH.