A New and Improved Chimney for Incandescent Gas, Electric, and Oil Lights.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
A New and Improved Chimney for Incandescent Gas, Electric,
and Oil Lights.
I, MILI ALTMAN, of 117, Back Church Lane, Commercial Road, in the County
of Middlesex, (Married Woman), Dealer in Gas Fittings, do hereby declare the
nature of this invention to be as follows:-
This chimney virtually consists of several glass concentric cylinders the ends of
which are joined or moulded together by glass shoulders so as to make one
piece. Although the cylinders are as before stated concentric yet they are of
different diameters. Thus the lowest cylinder which is the one that fits into
the gallery of the burner is about either 2 or 13 inches in diameter i.c. of such
a size as is suited to the gallery. The upper end of this is joined or moulded to
the lower end of the next cylinder which is from 3 to 3½ inches in diameter
and the axis of which is from 5 to 5½ inches in length. The upper end of this
second cylinder is joined or moulded to a third cylinder of 1 to 3 inches in
diameter and the length of the axis of which is from 2 to 2½ inches. All these
measurements are subject to enlargement or diminution according to the size
of the mantle used. This third cylinder is joined to the second cylinder by
either one or more shoulders rising successively above each other and upon this
shoulder (if one) or upon either shoulder (if more than one) rests a separate asbestos
ring. Upon this ring can if desired be rested a shade and thus is the necessity for
a separate shade holder or rest obviated.
The chimney may be either of plain ribbed fluted flashed tinted ground frosted
iced or opal glass of mica or any other semi-translucent material.
I claim
1. That by reason of the large diameter of the above mentioned second or
central cylinder the glass will not become coated with the volatile constituents
of the mantle and therefore will require little cleaning whereas the present narrow
chimney is difficult to clean on account of this coating.
2. By the larger diameter of the chimney the sides thereof are farther removed
from the mantle and therefore will not break in consequence of any defect in
such mantle.
3. For the same reason the chimney can be removed and replaced without risk
of injury to the mantle-such injury being the drawback-in the form of chimney
heretofore generally adopted.
4. No separate shade holder is required the interposition of the asbestos ring
upon one of the upper shoulders being a sufficient protection for the chimney and
shade.

page_text: A New and Improved Chimney for Incandescent Gas, Electric,
and Oil Lights.
I, MILI ALTMAN, of 117 Back Church Lane, Commercial Road, London, Married
Woman, 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 an improved chimney, which is adapted especially for
use with incandescent gas lamps." I have found that with chimneys of the
ordinary diameter the glass becomes coated with the volatile constituents of the
mantle, such coating being difficult to clean and reducing the transparency of
the chimney, also the liability of these chimneys to crack is very great, because
they are in close proximity to the mantle which is at an extremely high tempera-
ture when glowing; furthermore, in removing an ordinary chimney from the
gas burner, great care requires to be exercised in order to avoid damage to the
mantle because the diameter of the opening of the chimney is comparatively
small.
My invention is intended for the removal of these inconveniences and I ac-
complish this by making the chimney of concentric cylinders of different dia-
meters, said cylinders being connected together to form a single article, all parts
being mode of the same material. In my improved chimney, the diameter of
parts adjacent to the mantle is considerably larger than that of the chimneys
ordinarily in use, also the lower orifice is preferably made of such a size as will
fit the gallery of the burner in which the ordinary globe is carried, because it is
intended to dispense with such globes when my improved chimneys are used.
My invention further includes chimneys made with openings of the ordinary
size at the bottom, in order that the gallery of the burner may be utilized to
receive the bottom of a globe or saucer if desired.
In the accompanying drawings,
Figure 1 is an elevation partly sectional of a chimney constructed according to
my invention.
Figure 2 is an elevation shewing a modification.
A is the central portion of the chimney which is of comparatively large diameter.
B is the lower portion of somewhat smaller diameter adapted in Figure 1 to fit
the outer gallery of a burner of the ordinary size. The upper portion of the
chimney indicated at C is of smaller diameter than either of the other portions.
the proportions of the various parts being varied to suit requirements. The parts
of the chimney are connected together by shoulders of any suitable design, and I
do not restrict myself to the precise shapes shewn in the drawings for these con-
necting shoulders. It will be understood that the chimney is formed of one piece
of glass, metallic connecting pieces being avoided. The shoulder D between the
parts A and C is very conveniently utilized for supporting a shade as indicated in
dotted lines in Figure 1, the necessity for a separate shade holding device being
thereby avoided.
To prevent undue heating of the shade, I prefer to interpose between it and the
chimney a ring of asbestos paper or other suitable non-conducting material as
indicated at E.
In Figure 2, the lower portion B of the chimney is reduced to the size of the
lower portion of an ordinary chimney so that it can be used with an outer globe
if desired.
My improved chimneys may be made plain, ribbed, fluted, flashed, tinted,
ground, frosted, iced or opal glass, or may be etched or ornamented in any

page_text: desired or well known manner, or they may be made of mica or other suitable
translucent or transparent material. It is desirable that the material should be
as homogeneous as possible in order to avoid breakage through unequal expansion
of different parts of the chimney.
Although my improved chimneys are particularly well adapted for use with
incandescent gas lights, my invention is not limited in this respect, as they may
be employed with other gas lamps or with electric or oil lights.
Having now particularly described and ascertained the nature of my said in-
vention and in what manner the same is to be performed, I declare that what I
claim is:-
China constructed substantially as herein described with reference to the
W. P. THOMPSON & Co.,
322, High Holborn, London, W.C., Patent Agents for the Applicant.