IMPROVEMENTS IN LAMP CHIMNEYS
Year: 1885

page_text: I, DANIEL COLEMAN DEFRIES, of the Firm of J. Defries & Son 147 Houndsditch
London in the county of Middlesex Manufacturer do hereby declare the nature of
my invention for "IMPROVEMENTS IN LAMP CHIMNEYS" (a communication from
abroad by Louis Sepulchre of 33 Rue Bassinge, Liege, Belgium, Manufacturing
Engineer) to be as follows:-
My Invention relates to forms of lamp Chimneys adapted for use in conjunction
with the projection of hot air from a central current into the flame.
Having found that in lamps in which a central current of air is directed into
the flame, the ordinary forms of glass chimney are unsuitable, such chimneys
becoming rapidly discolored and greatly heated, and for other reasons I have sought
and attained a systematic curvature and bulge varied only by a slight modification
of the upper part to suit wicks of different diameter.
On the accompanying sheet of Drawing
Figure 1 illustrates in outline the particular form of chimney to suit a lamp
with projection of hot air as above mentioned, having a circular wick off inch
internal diameter and
Figure 2 represents a chimney adapted to suit a wick of 1 inch diameter.
The chimneys are drawn full size and the curves that I adopt are exactly those
given from A to B, and from B to C. It will be seen that the smaller chimney
Fig. 1 is straight from C to D and the larger chimney Fig. 2 slightly tapering
from C to D.
I have after careful and long continued experiment found that if the shape and
dimensions above given are strictly preserved, a current of hot air may be projected
from the centre into every part of the flame without discoloring or overheating the
chimney, and at same time producing a perfectly steady flame.
Dated this Flath 1ST 100
this

page_text: I DANIEL COLEMAN DEFRIES, of the firm of J. Defries and Sons of 147 Hounds-
ditch, London in the County of Middlesex, Manufacturer, do hereby declare the
nature of this invention (a communication from abroad by Louis Sepulchre of
Liège, Belgium Manufacturing Engineer), 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 forms of lamp chimneys adapted for use in conjunction
with the projection of hot air from a central current into the flame.
Having found that in lamps in which a central current of air is directed into
the flame, the ordinary forms of glass. chimney are unsuitable, such chimneys
becoming rapidly discolored and greatly heated, and for other reasons, I have
sought and attained a systematic curvature and bulge varied only by a slight
modification of the upper part to suit wicks of different diameter.
On the accompanying sheet of Drawing
Figure 1 illustrates in outline the particular form of Chimney to suit a lamp
with projection of hot air as above mentioned, having a circular wick of 7 inch,
internal diameter and
Figure 2 represents a Chimney adapted to suit a wick of 1 inch diameter.
The chimneys are drawn to scale, and the curves that I adopt are exactly those
given from A to B and from B to C. It will be seen that the smaller chimney
Fig. 1 is straight from C to D, and the larger chimney Fig. 2 slightly tapering
from C to D.
.
I have after careful and long continued experiment found that if the systematic
shape and dimensions above given are strictly preserved, the relative proportions.
being the same whatever may be the size of the Chimney, a current of hot air may
be projected from the centre into every part of the flame without discoloring or
overheating the Chimney, and at same time producing a perfectly steady flame.
Having now particularly described and ascertained the nature of my said
Invention, and in what manner the same is to be performed, I declare that what
I claim is :-
Lamp chimneys of the systematic shape and dimensions hereinbefore described
and shown on the drawing for the purpose specified.