An Improvement in Lamp Chimney Glasses.
Year: 1895

page_text: Date of Application, 25th Apr., 1895
Complete Specification Left, 22nd Nov., 1895-Accepted, 23rd May, 1898
PROVISIONAL SPECIFICATION.
An Improvement in Lamp Chimney Glasses.
I, JULIUS MOELLER, of No. 14 Palmer Street, Westminster, in the County of
London, Manager, do hereby declare the nature of this invention to be as
follows:-
My invention relates to a construction of lainp chimney glasses in such a manner
as to diminish their liability to crack. For this purpose, I make the lower part of
the glass, where it is subject to the greatest heat, extending from about the root of
the flame to a little distance above its top, or above the top of an incandescent
mantle when such a mantle is used, not of circular but of a kind of polygonal
transverse section, the polygon having no angles but presenting a number of
rounded ridges and furrows forming a corrugated or undulated circumference.
These ridges and furrows, extending longitudinally along the glass where it is
most heated, give it a certain freedom for local expansion and contraction, so that
it is less liable to crack when subjected to changes of temperature than a plain
cylindrical glass which cannot readily alter its form so as to yield under such
changes of temperature. Instead of confining the undulations to the zone of
highest temperature, they may be continued along the whole length of the
glass.
Dand thin orth 2 of boil 100%
ABEL & IMRAY,
Agents for the Applicant.
An Improvement in Lamp Chimney Glasses.
I, JULIUS MOELler, of No. 14 Palmer Street, Westminster, in the County of
London, Manager, 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 :-
My invention relates to a construction of lamp chimney glasses in such a manner
as to diminish their liability to crack. For this purpose, as shewn in elevation and
plan by Figs. 1 and 2 of the accompanying drawings, I make the lower part of the
glass, where it is subject to the greatest heat, extending from about the root of the
fame to a little distance above its top, or above the top of an incandescent mantle
when such a mantle is used, not of circular but of a kind of polygonal transverse
section, the polygon having no angles but presenting a number of rounded ridges
and furrows forming a corrugated or undulated circumference.
These ridges and furrows, extending longitudinally along the glass where it is
most heated, give it a certain freedom for local expansion and contraction, so that
it is less liable to crack when subjected to changes of temperature than a plain
cylindrical glass which cannot readily alter its form so as to yield under such
changes of temperature. Instead of confining the undulations to the zone of
highest temperature, they may he continued along the whole length of the glass as
shewn in Figs. 3 and 4.

page_text: 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 :-
A lamp chimney glass longitudinally corrugated substantially as and for the
purpose set forth.
Dated this 02nd d 100%
ABEL & IMRAY,
Agents for the Applicant.