An Improved Light Distributor or Reflector for Electric Incandescence Lamps.
Year: 1898

page_text: Date of Application, 29th Oct., 7898
Complete Specification Left, 27th July, 1899-Accepted, 2nd Sept., 1899
Date of Application, 29th Oct., 1898
Complete Specification Left, 27th July, 1899-Accepted, 2nd Sept., 1899
An Improved Light Distributor or Reflector for Electric
Incandescence Lamps.
I, CAMILLE FELDMANN, Official of the Firm: Vienna Electric Incandescence
Lamp Manufactory, Sturm & Cie., of IX. Lichtensteinstrasse, No. 12, Vienna,
Austria, do hereby declare the nature of this invention to be as follows:-
The reflectors of electric incandescent lamps of present construction suffer
from the defect, that when the globe of the lamp is of transparent glass, the
image of the bright filament is projected on to the reflector and consequently
the light reflected thereby is not of a uniformly distributed character. With
lamps having ground glass globes the light distribution is more uniform, but
these have the great disadvantage of absorbing a portion of the light, and they
also blacken in course of time, thereby still more seriously interfering with the
transmission of the light.
According to my present invention these disadvantages are avoided by using,
in combination with a transparent glass globe of the lamp, a small intermediate
light distributor of ground, cut, or opal glass fixed between the top of the globe
and the ordinary large reflector, such inner distributor being only of sufficient
size to prevent the image of the bright filament from being thrown on to the
large reflector, while at the same time it transmits the light thereof uniformly
distributed on to the latter, which thus reflects the light of the lamp in a uniform
manner, without any appreciable loss.
The said light distributor is preferably made of hemispherical form, of some-
what less diameter than the lamp globe.
Dated this 29th day of October 1898.
ABEL & IMRAY,
Agents for the Applicant.
COMPLETE SPECIFICATION.
An Improved Light Distributor or Reflector for Electric
Incandescence Lamps.
I, CAMILLE FELDMANN, Official of the Firm: Vienna Electric Incandescence
Lamp Manufactory, Sturm & Cie., of IX. Lichtensteinstrasse, No. 12, Vienna,
Austria, 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:-
The reflectors of electric incandescent lamps of present construction suffer
from the defect, that when the globe of the lamp is of transparent glass, the

page_text: image of the bright filament is projected on to the reflector and consequently
the light reflected thereby is not of a uniformly distributed character. With
lamps having ground glass globes the light distribution is more uniform, but
these have the great disadvantage of absorbing a portion of the light, and they
also blacken in course of time, thereby still more seriously interfering with the
transmission of the light.
According to my present invention these disadvantages are avoided by using,
in combination with a transparent glass globe of the lamp, a small intermediate
light distributor of ground, cut or opal glass fixed between the top of the globe
and the ordinary large reflector, such inner distributor being only of sufficient
size to prevent the image of the bright filament from being thrown on to the
large reflector, while at the same time it transmits the light thereof uniformly
distributed on to the latter, which thus reflects the light of the lamp in a uniform
manner without any appreciable loss.
'
Fig. 1 of the accompanying drawings is a vertical section of an electric incan-
descence lamp a and its usual reflector b with the light distributor c which is
preferably of hemispherical form as shewn in plan in Fig. 2 and in side view
in Fig. 3 and made of ground or opal glass.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is:-
In combination with an electric incandescence lamp a light distributor con-
structed and placed substantially as and for the purpose set forth.
Dated this 27th day of July 1899
ABEL & IMRAY,
Agents for the Applicant.