provements in or connected with Reflectors for Incandescence Electric and other Lamps.
Year: 1898

page_text: Date of Application, 29th Oct., 1898
Complete Specification Left, 29th July, 1899--Accepted, 2nd Sept.,
1899
PROVISIONAL SPECIFICATION
Improvements in or connected with Reflectors for Incandescence
Electric and other Lamps.
We, LOUIS JOHN STEELE, of 14, Clarendon Road, Holland Park, Kensington,
Electrical Engineer, Sir JOHN BLUNDELL MAPLE, Bart., M.P., of 145, Tottenham
Court Road, and JOHN VERITY, of 31, King Street, Covent Garden, Manufacturer,
all in the County of London, do hereby declare the nature of this invention
to be as follows:
Our invention relates to reflectors for incandescence electric and other lamps
and consists in the combination with a glass, porcelain or other support, either
solid or hollow, of a filling or layer of a substance or combination of substances
capable of becoming phosphorescent or having fluorescent qualities under the
action of light or heat, and preferably such of these materials as are light or white
in colour, in order that a maximum of efficiency may be obtained.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London,
Agents for the Applicants.
Improvements in or connected with Reflectors for Incandescence
Electric and other Lamps,
We, LOUIS JOHN STEELE, of 14, Clarendon Road, Holland Park, Kensington,
Electrical Engineer, Sir JOHN BLUNDELL MAPLE, Bart., M.P., of 145, Tottenham
Court Road, and JOHN VERITY, of 31, King Street, Covent Garden, Manufacturer,
all in the County of London, 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:-
Our invention relates to reflectors for incandescence electric and other lamps
and consists in the combination with a glass, porcelain or other support, either
solid or hollow, of a filling or layer of a substance or combination of substances
capable of becoming phosphorescent or having fluorescent qualities under the
action of light or heat, and preferably such of these materials as are light or white
in colour, in order that a maximum of efficiency may be obtained.
As examples of substances or combination of substances suitable for use in
connection with out invention we would mention the following:-
1. The phosphides of alkaline metals such as calcium, sodium and potassium.
2. A phosphorus paste made by mixing phosphorus with an inert powder.

page_text: 3. Sulphide of calcium.
4. The substance known as Canton's phosphorus" made by heating calcined
oyster shells with sulphur.
5. "Bolognian phosphorus" made by heating heavy spar (Ba SO₁) with gum
tragacanth.
6. Fused nitrate of potassium.
7. Sulphide of barium.
Under some conditions sulphur or saccharine will emit phosphorescent rays.
These substances might be useful owing to their pure white colour and crystalline
nature.
When these substances are use in combination with reflectors of the kind
described in the specifications of our applications of the 29th October and 7th
November 1898, Nos. 22803 and 23420 respectively the composition is preferably
placed within such reflectors but where the reflector is made solid the substances or
material may be applied as a coating upon the surface of the same the coating in
the case of a transparent body being preferably upon the rear side and in the case
of an opaque body upon the front side. It is also to be understood that our
reflectors may be used either in combination with electric lamps or with gas or
other lamps or lighting apparatus.
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed, we declare that what
we claim is:
-
In a reflector for electric incandescence and other lamps the combination
with a glass, porcelain or other support either solid or hollow of a filling or layer
of a substance or combination of substances capable of becoming phosphorescent
or having fluorescent qualities under the action of light or heat, substantially as
described.
. 1 1
300
1
I
G. F. REDFERN & Co.,
4, South Street, Finsbury, London,
Agents for the Applicants.