IMPROVEMENTS IN GLASSES OR CHIMNEYS FOR LAMPS
Year: 1884

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I, JOHN HENRY JOHNSON of 47 Lincolns Inn Fields in the County of Middlesex'
Gentleman do hereby declare the nature of said Invention for "IMPROVEMENTS
IN GLASSES OR CHIMNEYS FOR LAMPS which Invention has been communicated
to me from Abroad by Wilhelm Hirsch of Radeberg Saxony, German Empire to be
as follows:-
Hitherto the direct action of the rays from the flame of a lamp with an ordinary
glass or chimney has been moderated or diminished by screens shades or Globes of
opaque or obscured glass carried by a gallery of the lamp or held on the cylinder
by intermediate spring devices or the glass or chimney itself has been partly
obscured by the Sand blast or other process.
Now in order to blind or obscure part of the glass or chimney of lamps in cases
where it is not desirable to make use of the above mentioned devices; there is used
according to this Invention in substitution therefor a jacket fitting over a part of
the glass or chimney and hanging on a shoulder or swelled part of the said glass
or chimney.
This jacket may be made of opaque obscured or other glass or of porcelain or
any other suitable material which will allow the rays from the flame to pass but
will moderate or diminish the direct action of the said rays. The upper part of
the said jacket is preferably contracted to fit or hang over and be supported by the
shoulder or swelled part of the glass or chimney. The remaining or lower portion
of the jacket may be of any desired form so as to correspond with the form of the
glass or chimney.
This part of the jacket preferably fits loosely around the glass or chimney so as
to allow of expansion of the latter under the influence of the heat. In some cases
the glass or chimney may have a projecting rim upon which the said Jacket rests
or hangs.
DL

page_text: I, JOHN HENRY JOHNSON of 47 Lincolns Inn Fields in the County of Middlesex
Gentleman do hereby declare the nature of this Invention for "IMPROVEMENTS
IN GLASSES OR CHIMNEYS FOR LAMPS" which Invention has been communicated
to me from Abroad by Wilhelm Hirsch of Radeberg, Saxony, German Empire and
in what manner the same is to be performed to be particularly described and
ascertained in and by the following statement :-
Hitherto the direct action of the rays from the flame of a lamp provided with
an ordinary glass or chimney has been moderated or diminished by shades or globes
of semi-opaque or obscured glass carried by a gallery or projections from the lamp
or held upon the glass or chimney by spring devices or their equivalents or the
material of the glass or chimney itself has been partly obscured by the sand blast
or by other process.
The object of this Invention is to provide a means of diminishing or moderating
the rays from the flame of a lamp in cases where it is not desirable to make use of
the above mentioned ordinary means of effecting this object. According to this
Invention there is used in substitution for the said ordinary means a jacket for
passing over and encircling the glass or chimney at the part through which the
direct rays from the lamp pass, the said jacket. being supported in position by
hanging on a shoulder or swelled part of the said glass or chimney, or by resting
upon a rim or upon projections formed on the said glass or chimney. This jacket
may be made of any material which will answer the purpose of diminishing or
moderating the rays from the flame such as, for example, opal semi-opaque or
obscured glass or porcelain, and the said jacket may be of any desired form
preferably being made to correspond to the form of the glass or chimney and of
such a circumference as to fit loosely around the said glass or chimney, so as
to allow of expansion of the latter under the action of the heat from the flame
of the lamp.
In the accompanying drawing I have shewn three ways in which the said jacket
may be applied:
Figure 1. is a part section and part elevation of a chimney or lamp glass c having
a shoulder b formed thereon upon which shoulder the jacket a hangs by means of
the contracted part a² formed on the said jacket a. There is shewn a sufficient
space between the interior of the jacket and the exterior of the glass or chimney
to allow of the expansion of the latter. Figures 2 and 3 shew parts of a lamp
glass or chimney chaving a rim 62 upon which the lower edge of the jacket a rests.
In Figure 2 the jacket is only formed to encircle the nearly cylindrical part of the
glass or chimney but in Figure 3 the said jacket has a curved form to correspond
with the form of glass or chimney_shewn.
I wish it to be understood that I do not pretend to any claim to the hereinbefore
mentioned ordinary modes of diminishing or moderating the rays from the lamp
flames by obscuring the glass or chimney or by means of screens globes or shades
resting upon a gallery or projections of the lamp or suspended or attached to the
glass or chimney by springs or equivalent devices.
Having now particularly described and ascertained the nature of said Invention
and in what manner the same is to be performed I declare that what I claim is :-
1st Chimneys or glasses for lamps consisting in the combination of a rays-
diminishing or moderating jacket, and a lamp glass or chimney proper the latter being

page_text: provided with a shoulder rim or projection upon which the former hangs or rests
substantially as herein before described and illustrated by the accompanying
drawings.
2nd The manufacture and use of a jacket of opal, semi-opaque or obscured glass
or porcelain or other suitable semi-opaque or obscured material forming, or to form,
part of a lamp chimney or glass substantially as hereinbefore described and illustrated
by the accompanying drawings.
DOLL
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