IMPROVEMENTS IN THE MANUFACTURE OF GLASS CHIMNEYS FOR LAMPS
Year: 1840

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JAMES
DEACON, of No. 136, Saint John Street, Road, in the County of Middlesex;
Gentleman, send greeting.
WHEREAS Her present most Excellent Majesty Queen Victoria, by Her
Letters Patent under the Great Seal of Great Britain, bearing date at West-
minster, the Nineteenth day of November, in the fourth year of Her reign,
did, for Herself, Her heirs and successors, give and grant unto me, the said
James Deacon, Her especial license, full power, sole privilege and authority,
that I, the said James Deacon, my exors, admors, and assigns, or such
others as I, the said James Deacon, my exors, adñiors, or assigns, should at
any time agree with, and no others, from time to time and at all times during.
the term of years therein expressed, should and lawfully might make, use, exer-
cise, and vend, within England, Wales, and the Town of Berwick-upon-Tweed,
my Invention of "IMPROVEMENTS IN THE MANUFACTURE OF GLASS CHIMNEYS FOR
LAMPS;" in which said Letters Patent is contained a proviso that I, the said
James Deacon, shall cause a particular description of the nature of my said In-
vention, and in what manner the same is to be performed, to be inrolled in Her.
said Majesty's High Court of Chancery within six calendar months next and
immediately after the date of the said in part recited Letters Patent, as in
and by the same, reference being thereunto had, will more fully and at large
appear.
NOW KNOW YE, that in compliance with the said proviso, I, the said
James Deacon, do hereby declare, that the nature of my said Invention, and

page_text: the manner in which the same is to be performed, are fully described and
ascertained in and by the following statement thereof, reference being had to
the Drawing hereunto annexed, and to the figures and letters marked thereon
(that is to say):-
My Invention relates to Improvements in the Manufacture of Glass Chim-
neys for Lamps, whereby a projecting ring or partition of glass is formed
within each chimney, such partition having a circular A opening therein
through which the flame of the lamp passes, and the projecting ring or parti-
tion should be-so-placed-in respect of the lower-part-of-the chimney that the
opening of the partition may when in use come to a position above the wick or
point of combustion of the lamp, which arrangement will cause the air ascending
from below upwards (to support the combustion of the flame) to be prevented
ascending parallel with the chimney; on the contrary, the air as it ascends,
coming in contact with the projecting ring or partition, will be deflected off
towards the centre or middle of the chimney, by which means the combustion
will be more complete, and the shadow caused by metal deflectors will be
avoided. And in order that my Invention may be most fully understood and
readily carried into effect, I will proceed to describe the Drawing hereunto
annexed.
"
DESCRIPTION OF, THE DRAWING:
Figures 1;. 2, and. 8 shew. three cylindrical glass chimneys, constructed
according to my Invention, the only difference in these Figures being in the
inclination of the internal projecting ring or partition. Figure 4 shews
another glass chimney constructed according to my Invention, the upper part
of which is formed conical. And I would 'remark that'my' Invention does not
depend on the external figure of the chimney, but relates to the new mode of
constructing glass chimneys with internal projecting rings or partitions of glass:
In each of the figures a, a, indicates the glass chimney, and b, b, the internal
projecting ring or partition of glass; and when a chimney is completed according
to my improvements, the whole is composed of one piece of glass. In making
a chimney according to my Invention, the workman proceeds as if he were
about to blow a cylindrical chimney of glass. Opposite the point 6, by means of
callipers, he causes the cylinder to be girt in, as is shewn at Figure 5, until
the opening c, d, through that part which becomes the partition, is of the size
desired. He then causes the surfaces e, e, to be pressed together, when they
will become one plate or surface, as described. In respect to the partitions b, 'iti
Figures 1, 2, 3, and 4, the workman, using a maundrel whilst the chimney
is yet hot, to press the partitions upwards or downwards, according as he wishes

page_text: to have the partition, or he lets it remain in a horizontal position, as is shewn
at Figure 4. The operation of blowing glass being well understood, a work-
man acquainted with such process will, from the description above given,
readily blow chimneys, and form the projecting rings or partitions 6 therein.
The chimneys being completed, they are to be carefully annealed, as is well
understood.
Having thus described the nature of my Invention, and the manner of per-
forming the same, I would remark, that I am aware that it is not new to cause
the air which supports the combustion of the flame to be deflected in a direction
towards the centre or middle of the chimney at a point above the wick or
point of combustion of the lamp, metallic surfaces having been used for such
purposes before, and Patents having been taken for the means of applying such
metallic surfaces; and I am also aware that glass chimneys have been made
with contracted openings from the lower portion thereof into the upper portions
thereof, as is indicated by Figure 5, but I believe they have not been successful
I would therefore have it understood that what I claim as my Inven-
tion is, the new combination of means, and the new construction of chimneys
for lamps, herein described, by projecting rings or partitions of glass, having
each an opening through it for the flame to pass, as herein-before described.
In witness whereof, I, the said James Deacon, have hereunto set my
hand and seal, this Nineteenth day of May, in the year of our Lord
One thousand eight hundred and forty-one.
JAMES (LS.) DEACON.
AND BE IT REMEMBERED, that on the Nineteenth day of May, in
the
year of our Lord 1841, the aforesaid James Deacon came before our
said Lady the Queen in Her Chancery, and acknowledged the Specification
aforesaid, and all and every thing therein contained and specified, in form
above written. And also the Specification aforesaid was stamped according to
the tenor of the Statute made for that purpuse.
Inrolled the Nineteenth day of May, in the year of our Lord One
thousand eight hundred and forty-one.