IMPROVEMENTS IN LAMP CHIMNEYS
Year: 1877

page_text: LETTERS PATENT to William Frederick Heshuysen, of Zandport, Kingdom of
Holland, at present of 123, Chancery Lane, in the County of Middlesex, for
the Invention of "IMPROVEMENTS IN LAMP CHIMNEYS."
Sealed the 23rd November 1877, and dated the 26th May 1877.
PROVISIONAL SPECIFICATION left by the said William Frederick Heshuysen
at the Office of the Commissioners of Patents on the 26th May 1877.
[
WILLIAM FREDERICK HESHUYSEN, of Zandport, Kingdom of Holland, at present
of 123, Chancery Lane, in the County of Middlesex. IMPROVEMENTS IN LAMP:
CHIMNEYS."
This Invention consists in making lamp chimneys of mica for use for lamp
burners for oils of all kinds or for gas burners, so as to prevent the giving off-of
smoke, whilst the said chimneys will be unbreakable.
I construct the chimneys of cylindrical form and made from sheets of mica, and
to prevent smoking I fix inside the said chimney, at required height above the flame,
a circular partition or disc, likewise of mica or of toughened glass, said partition or
dise being made with an open space at the centre, the form of said open space being
dependent on the form of the wick or of the flame.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said William Frederick Heshuysen in the Great Seal Patent Office on the
26th November 1877.
"
WILLIAM FREDERICK HESHUYSEN, of Zandport, Kingdom of Holland, at present
of 123, Chancery Lane, in the County of Middlesex. IMPROVEMENTS IN LAMP
CHIMNEYS."
This Invention consists in making lamp chimneys, used for lamp burners for oils
of all kinds or for gas burners, of mica, so as to prevent the giving off of smoke,
whilst at the same time the said chinneys will be unbreakable.
And in order that the said Invention may be fully understood I shall now proceed
more particularly to describe the same, reference being made to the accompanying
Drawing, where Figure 1 is an elevation of one of my improved lamp chimneys,
and Fig. 2 a plan thereof.
I construct the chimney A of a cylindrical form (as in ordinary glass chimneys)
from sheets of mica in one or more lengths or pieces, joined together at their upright
meeting edges by narrow strips a of metal, to which the mica is attached by pressing
or hammering, or the meeting edges may be joined together by any other means
that may be found most suitable. If the chimney A is made in more than one
length or piece the several lengths or pieces are united by simple overlapping, as
shewn at c.
The bottom end of the chimney, where it is inserted into the holder on the lamp;
is protected by a ring of brass or other metal d, as shewn.
To prevent smoking I fix inside the chimney A, at the required height above the
burner or flame (not, shewn on the Drawing), a circular partition or disc B, also
made of mica or of toughened glass, and formed with an opening or hole e through
its centre, the shape of which is dependent upon that of the wick or flame which
plays through it. This partition or disc is held in its proper position inside the
chimney A by two small pins or brackets f, f, attached to the two strips a before
mentioned, and projecting sufficiently forwards into the interior of the chimney to
support the said partition or disc. By this Invention an indestructible chimney is
obtained.
-
Having now described the nature of my said Invention, and the manner in which
the same.is.or may be used or carried into effect, I would observe in conclusion that
what I consider novel and original and therefore claim as the Invention secured to
me by the herein-before in part recited Letters Patent is, the combination and use
of a partition or disc made of mica with the chimneys of lamps, substantially as
and for the purpose herein-before described and illustrated by the accompanying
Drawing.
In witness whereof, I, the said William Frederick Heshuysen, have hereunto
set my hand and seal, this Nineteenth day of November, in the year of our
Lord One thousand eight hundred and seventy-seven.