Improvements in Bulbs for Electric Incandescence Lamps.
Year: 1899

page_text: PROVISIONAL SPECIFICATION.
Improvements in Bulbs for Electric Incandescence Lamps.
I, CURT BARTENSTEIN, of 27, Skalitzerstrasse, Berlin, in the Empire of Ger-
many, Manufacturer, do hereby declare the nature of this invention to be as
follows:-
This invention relates to bulbs for glow lamps which are characterized by
being formed with equatorial or circular grooves or rings.
These rings are provided with the object of diffusing the rays of light from
the lamp and to diffuse the light, so that instead of seeing the incandescent fila-
ment only luminous rings are visible, such rings being arranged so close to each
other as to cause the entire bulb to appear like a single light giving surface.
By arranging the rings or grooves parallel around the circumference a uniformly
symmetrical and pleasant luminous effect is obtained which would not be the case
were they arranged in meridian lines because of their following almost exactly
the direction of the incandescent filament and consequent failing in diffusing
the light in any way like the equatorial rings.
Moreover these equatorial or parallel rings throw the light more in a down-
ward direction than do the meridian rings or grooves and this manner of direct-
ing the rays of the light is what is required in most cases.
A further advantage of the said equatorial or parallel rings is that the rings
are arranged in the same direction in which the bulbs are revolved in the mould
during manufacture, in consequence of which the rings are very smooth and even,
while bulbs with meridian rings cannot be revolved at all in the mould and are
therefore never smooth.
In carrying out the said invention the rings are arranged at right angles to
the longitudinal axis of the bulb.
Obviously the form of the bulb may be of any other desired form and further-
more the rings may be of any convenient cross-section.
Doted this 92nd day of April 1899
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.
Improvements i
I, CURT BARTENSTEIN, of 27, Skalitzerstrasse, Berlin, in the Empire of Ger-
nany, Manufacturer, do hereby declare the nature of this invention and in what
Price Sd.1

page_text: manner the same is to be performed, to be particularly described and ascertained
in and by the following statement:--
This invention relates to bulbs for glow lamps which are characterized by
being formed with equatorial or circular grooves or rings.
These rings are provided with the object of braking the rays of light from the
lamp and to diffuse the light, so that instead of seeing the incandescent film only
luminous rings are visible, such rings being arranged so close to each other as to
cause the entire bulb to appear like a single light giving surface. By arranging
the rings or grooves parallel around the circumference a uniformly symmetrical
and pleasant luminous effect is obtained which would not be the case were they
arranged in meridian lines because of their following almost exactly the direction
of the incandescent film and consequent failing in braking or diffusing the light
in any way like the equatorial rays.
Moreover these equatorial or parallel rings throw the light more in a downward
direction than do meridian rings or grooves and this manner of directing the
rays of the light is what is required in most cases.
A further advantage of the said equatorial or parallel rings is that they are
arranged in the same direction in which the bulbs are revolved in the mould
during manufacture in consequence of which the rings are very smooth and even,
while bulbs with meridian rings cannot be revolved at all in the mould and are
therefore never smooth.
My invention is clearly shown in the accompanying drawing in which
Figure 1 is an elevation of the improved bulb and
Figure 2 a vertical section of the same partly in elevation.
In carrying the said invention into practice the rings a are arranged at right|
angles to the longitudinal axis A A of the bulb b.
Obviously the bulb may be of any other desired form, such for example as
represented by the dotted lines in Figure 1 and furthermore the rings may be
of any convenient cross-section.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is:-
-
A bulb for electric incandescent lamps of any desired form provided with
equatorial grooves or rings of any suitable section substantially as hereinbefore
described.
Dated this 20th day of January 1900.
HASELTINE, LAKE & Co..
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.