Improvements in Lamps and Lamp Chimneys for Burning Mineral Oils.
Year: 1892

page_text: Date of Application, 18th Feb., 1892
Complete Specification Left, 18th Nov., 1892-Accepted, 21st Jan., 1893
PROVISIONAL SPECIFICATION.
1
Improvements in Lamps and Lamp Chimneys for Burning
Mineral Oils.
DANIEL COLEMAN DEFRIES, Managing Director of The Metropolitan Light
Company Limited 43 & 44 Holborn Viaduct in the City of London do' hereby
declare the nature of this invention to be as follows:-
My invention relates to lamps for burning mineral & other oils & their chimneys
whereby I ensure absolute immunity from explosion, give great capillary, power
ensure perfect combustion of the gases generated & provide a simple means of
lighting the lamp without removing the globe or chimney.
.
My first improvement consists in soldering or otherwise joining to, the inside of
the oil reservoir a twisted metal tube which shall extend from the top to the
bottom of the said reservoir. On the top of the tube I make an opening & cover
it with wire gauze of not less than 29 meshes to the inch. I provide at the
bottom of the tube one or more holes to allow the oil to flow through, which I
likewise cover with a similar size gauze. In a round wick lamp I also employ a
twisted tube instead of the usual plain tube.
My second improvement consists of a tube perforated, on its vertical sides &
used in combination with a flame spreader held in the middle of the flame in the
usual manner. The tube is left open on top to allow, of. a current of air passing
right through, as well as through the side perforations to ensure perfect
combustion.
My third improvement consists of a method of raising the chimney & globe
holder for the purpose of lighting the lamp without removing either, & consists of
three or more curved strips of metal with slots cut through which, I attach to the
bottom part of the chimney holder & of 3 straps or pieces of metal with studs or
other fastenings (which project through the said slots) which I attach to the top
part of the chimney holder thus allowing this top part to be raised by simply
turning it.
My fourth improvement consists of a lamp chimney in which the heat does not
affect the glass,by reason of my using a systematic curvature of the bulge, which,
being smaller at the top than at the bottom forms a combustion chamber, while
to ensure a perfect & sufficiently powerful updraught without lengthening the
chimney, I taper that, part of the chimney which is above the combustion
chamber, outwards towards the top.
Dated this: Eighteenth day of February 1892.
COMPLETE SPECIFICATION.
Improvements in Lamps and Lamp Chimneys for Burning
Mineral Oils.
.
1 DANIEL COLEMAN DEFRIES, Managing Director of The Metropolitan
Light Company Limited, of 43 and 44 Holborn Viaduct in the City and County
of London, 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 improvements in lamps for burning mineral and other
oils; and in their chimneys, having for object to ensure immunity from explosion,
to obtain great capillary power, perfect combustion of the gases generated and to

page_text: provide a simple means of lighting the lamp without removing the globe or
chimney.
I will now proceed to describe my improvements with reference to the accom-
panying drawing upon which :-
:-
Figure 1. is a vertical section through a lamp embodying my invention;
Figure 2. is an elevation of the upper portion of the burner with chimney and
globe holder in position;
Figure 3. is a similar view but shews the chimney and globe holder raised;
Figure 4. shews method of forming the curved strips for raising gallery, and
Figure 5. is a vertical section through the chimney.
A represents the oil container or reservoir,
B inner or centre tube,
C tube extending from top to bottom of reservoir,
D opening in upper end of same,
E opening at bottom of tube for admission of oil,
F burner tube,
G perforated tube carrying flame spreader,
H globe holder,
I curved strips,
K slots in same,
L studs moving in slots K,
M handle for turning globe holder,
N strips of metal pierced to form curved strips I,
O the chimney,
P bulge forming combustion chamber,
Qneck or opening above same,
R opening at top of chimney.
Joined to the inside of the oil reservoir A is a metal tube B, extending from
the top to the bottom of the said reservoir. At the upper end of the outer tube C,
soldered to bottom and top or to the top only of the reservoir, is an opening D,
covered with wire gauze of not less than 29 mesh to the inch. At the bottom of
the tube are one or more holes E or the said tube may be made to come within a
small distance from the bottom of the reservoir so as to allow the oil to flow
through, which holes or apertures I may likewise cover with a similar gauze. A
tube G perforated on its vertical sides is used in combination with a flame spreader
held in the middle of the flame in the usual manner; this tube is left open on top
to allow of a current of air passing right through, as well as through the side
perforations, to ensure perfect combustion and save breakage of chimneys.
The arrangement which I use for raising the chimney and globe holder H for
the purpose of lighting the lamp without removing either, consists of three or
more curved strips I of metal with slots K cut through, which I attach to the
bottom part of the chimney holder and of three straps or pieces of metal with
studs or other fastenings L, (which project through the said slots K) which I
attach to the top. part of the chimney holder, thus allowing this top part, on
which the globe and chinney rest, to be raised by simply turning the handle M.
My invention further consists of a lamp chimney O in which the heat does not
affect the glass by reason of my using a systematic curvature of the bulge P which,
being smaller at the top Q, than at the bottom, forms a combustion chamber, while
to ensure a perfect and sufficiently powerful up draught without lengthening the
chimney, I taper that part of the chimney which is above the combustion chamber,
outwards towards the top R.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1. An improved lamp for burning mineral oils consisting of a reservoir having a
central air tube an outer tube perforated ton and bottom. a perforated tube

page_text: carrying flame spreader and open at the top, together with means for carrying and
raising globe and chimney, all constructed combined and arranged to operate
substantially as hereinbefore described with reference to the accompanying
drawing.
2. In a lamp for burning mineral oils the perforated tube G open at the top as
and for the purposes set forth.
3. A chimney for lamps burning mineral oils having a combustion chamber with
systematic curvature (P) and smaller at the top than at the bottom, in combination
with a tapering of the tube outward from above the combustion chamber to the
top (R) of the chimney as hereinbefore described with reference to the accom-
panying drawing.
Dated this Eighteenth day of November 1892.