Improvements in Lamp Chimneys.
Year: 1894

page_text: Date of Application, 27th Aug., 1894-Accepted, 20th Oct., 1894
COMPLETE SPECIFICATION.
Improvements in Lamp Chimneys.
We, AUGUST LANDSBERG and GEORG OLLENDORFF, of Frankfort on the
Main, Elbe Strasse 46, in the Kingdom of Prussia, Empire of Germany, Manu-
facturers, 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 aud by the
following statement :--
The present invention relates to an improved lamp chimney made of mica and
has for object to provide a chimney for petroleum and similar lamps, which, while
having all the advantages of ordinary glass chimneys, has not the disadvantages
of these latter in regard to liability to crack or break on becoming heated or
of getting broken and rendered useless in many other ways.
Our invention further offers a much more convenient means of lighting the
lamp without having to remove the chimney and as the same means can also be
used for extinguishing the flame, there is no necessity to blow down the chimney
as heretofore and thus the danger of explosion is removed altogether.
We will explain our invention with reference to the accompanying drawings in
which:
Fig. 1 is an elevation of the lamp chimney as made for large buruers.
Fig. 2 is a similar elevation showing the chimney for small burners.
Fig. 3 is a conical inner chimney for small burners, while,
Fig. 4 shows the inner chimney used for large burners.
Our invention consists essentially of a frame composed of upper and lower
rings E' and B and vertical connecting or side strips D, all of metal or other
suitable material, and of one or more cylindrical lengths of mica the ends of which
can be fastened to the rings E' and B in any suitable way.
In the chimney shown in the drawings, two lengths of mica are used and jointed
at G. The connecting or side strips D are made double, and, as the cylindrical
mica lengths are inserted between same, said lengths are supported on both sides.
The lower part of the chimney is provided with an opening C about on a level
with the flame and which opening is normally covered by a small disc or cover C¹
pivoted on to one of the side strips D. When it is required to light the lamp, it is
simply necessary to turn the small disc or cover C¹ to the right, insert the lighted
match or taper through the opening C, light the lamp, withdraw the match and
then close the opening again.
In this way the lamp chimney itself need not be disturbed at all. To extinguish
the flame it is merely necessary to blow through the opening C, any danger of
explosion being thereby averted.
For increasing the illuminating effect of the flame in the case of small burners,
we enclose said flame in a small conical inner chimney H' (as shown in Figs. 2
and 3) attached to a ring F, both the inner chimney and the ring being of mica.
Said ring F' is formed to the shape of the outer chimney so as to wedge itself
when pushed upward in order to hold the conical part H¹ in position.
There is a more perfect regulation of air in the small inner chimney and the
illuminating effect is thereby increased.
In the case of large burners we find it better to strengthen the outer cylinder
just above the flame, and, for this purpose, employ a small inner chimney of
mica H as shown in Fig. 4 and which is held in position underneath by a mica
ring F made to wedge itself in the outer chimney whilst the upper end of said
inner chimney contacts with and merges into the conical form of the chimney
broner.

page_text: Where the small conical inner chimney H' is used, the same must be provided
with an opening C corresponding to that C of the outer chimney so as to allow
access to the flame without removing said outer chimney, but said opening C² need
have no cover as in the case of the chimney proper.
Our improved chimney will be found to be superior in every respect to those
hitherto in use by reason of its greater strength and durability and less comparative
cost on account of the less liability to breakage.
Having now particularly described and ascertained the nature of our inven-
tion and in what manner the same is to be performed, we declare that what
we claim is :
1. The use of mica instead of glass for the chimneys of petroleum and other
similar lamps substantially as described.
2. In an improved lamp chimney of mica, the combination of cylindrical lengths
of mica E with side or connecting strips or supports D and rings E' and B, of
metal or other suitable material, substantially as set forth and shown in the
drawings.
3. In an improved lamp chimney of mica, the combination of an opening C
with a small disc or other suitable cover C³ and side or connecting strip or
support D for the purpose of lighting the lamp or extinguishing the flame without
removing the outer chimney or chimney proper substantially as described and
shown in the drawings.
4. In an improved lamp chimney of mica, the combination of a small inner
chimney of mica H, H' of conical or any other form with a mica ring F, F¹, and
the outer chimney or chimney proper substantially as and for the purpose
set forth.
5. In an improved lamp chimney of mica, the combination of an opening C³ of
the inner chimney with the opening C and cover C¹ of the outer chimney or
chimney proper substantially as and for the purpose set forth.
Dated this 27th day of August 1894
J. E. EVANS-JACKSON & Co.,
Agents for the Applicants.