Improvements in Lamp-chimneys.
Year: 1891

page_text: Date of Application, 20th Nov., 1891
Complete Specification Left, 16th Aug., 1892-Accepted, 17th Sept., 1802
PROVISIONAL SPECIFICATION.
Improvements in Lamp-chimneys.
I, ANNA DENDER of Vichhofstrasse 77, Elberfeld in the Empire of Germany,
Manufacturer, do hereby declare the nature of this invention to be as follows:-
The object of this invention is to increase as much as possible the illuminating
power of circular burners of petroleum lamps and it consists of a chimney which is
reduced or contracted at two parts between which is formed an enlargement or
bead. These parts of the chimney surround the flame in such a manner that it is
first contracted and somewhat compressed by the lower of the narrowed portions
then allowed to expand in the enlarged portion and is again contracted at the
upper of the narrowed portions after passing which it once more developes in the
funnel-shaped upper portion of the chimney.
This alternate contraction and expansion of the flame causes both the external
air and the air admitted through the burner-tube to mix so thoroughly with the
products of combustion that the flame considerably increases in extent becoming
very wide in the enlarged portion.of the chimney and reaching to a considerable
height in the upper part.
The base and top of the chimney are formed with corrugations which serve for
strengthening these parts, it having, been found especially in the case. of compara-
tively large chimneys that said corrugations very much lessen the chances of
bursting as the considerable increase of the total thickness of the walls of the
chimney. thus obtained correspondingly adds to the power of resistance of the same.
The number and shape of the undulations are entirely optional.
It may also be mentioned that chimneys thus ribbed or corrugated will sustain
without damage certain shocks which ordinary smooth chimneys are incapable of
withstanding.
Dated this 20th day of November 1891.
W. P. THOMPSON & BOULT,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Lamp-chimneys.
I, ANNA DENDER, of Vichhofstrasse 77, Elberfeld, in the Empire of Germany,
Manufacturer, 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 object of this invention is to increase as much as possible the illuminating
power of circular burners of petroleum lamps, and it consists of a chimney which,
as shown in the accompanying drawing, is reduced or contracted at a and b
between which is formed an enlargement or bead c. These parts of the chimney
surround the flame in such a manner that it is first contracted and somewhat
compressed by the narrow portion a, then allowed to expand in the enlarged
portion c, and is again contracted at b, after passing which it once more developes
in the funnel-shaped upper portion of the chimney.
This alternate contraction and expansion of the flame causes both the external
air and the air admitted through the burner-tube to mix so thoroughly with the
products of combustion that the flame considerably increases in extent, becoming
very wide in the enlarged portion of the chimney and reaching to a considerable
height in the upper part,
C

page_text: The base and top of the chimney are formed with corrugations d, e, which serve
for strengthening these parts, it having been found, especially in the case of com-
paratively large chimneys, that said corrugations very much lessen the chances of
bursting; as the considerable increase of the total thickness of the walls of the
chimney, thus obtained, correspondingly adds to the power of resistance of the
same. The number and shape of the undulations are entirely optional.
It may also be mentioned that chimneys thus ribbed or corrugated will sustain
without damage certain shocks which ordinary smooth chimneys are incapable of
withstanding.
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 [
claim is,―
1. A. lamp chimney for circular burners of petroleum lamps comprising two or
more contracted parts a and b situated one above the other and one or more
enlargements or beads c substantially, as described and illustrated in the accom-
panying drawings.
2. Annular corrugations such as d e formed at one or both ends of a lamp
chimney substantially as described and illustrated in the accompanying drawings.
Dated this 16th day of August 1892.
W..P. THOMPSON & BOULT,
Agents for the Applicant.