Certain Improvements in and connected with Safety Oil Lamps.
Year: 1890

page_text: Date of Application, 11th Jan., 1890
Complete Specification Left, 11th Oct., 1890-Accepted, 15th Nov., 1890
PROVISIONAL SPECIFICATION.
Certain Improvements in and connected with Safety Oil Lamps.
I, GEORGE HENRY LESTER, of Midland Metal Works, Coventry, Warwickshire,
Works Manager, do hereby declare the nature of this invention to be as follows:-
This invention has reference more particularly to those oil lamps in which the air to
feed the flame passes up through a space or spaces between the oil vessel and the out-
side casing of the lamp thereby keeping the oil vessel cool. Heretofore in this class
of lamp a fan operated by clock work or other mechanical means has been used to
force the air up the said passages to feed the flame and a large and brilliant flame has
resulted; but by my invention 1 obtain a flame of equal luminosity without the
employment of clock work or other mechanism thereby considerably reducing the cost
of the lamp.
For the purposes of this invention I employ a flat wick and instead of making both
sides of the wick tube the same height and the top of the wick tube straight or nearly
straight as is usual, I make one side of the said tube higher than the other the top of
this higher tube being curved to the required shape of the top of the wick wlien
burning so that it will form a guide for cutting or rubbing the wick to the proper
shape. By this means I ensure a flat.flame of uniform shape along the top.
I use a globe or chimney of a particular size and form the lower part of which is of
bulbous shape curving upwardly to a smaller hole or chimney port at the top. The
opposite sides of the lower bulbous part of this globe or chimney are or may be flattened
so as to reduce the spaces between them and the sides of the flame and thus cause the
flame to widen or spread out which increases its luminosity. That part of the globe
which is above the flame has also to be at a particular distance therefrom so as to give
the proper speed for the air past the flame to ensure thorough combustion.
Dated this 10th day of January 1890.
CHARLES BOSWORTH KETLEY,
Agent for the Applicant.
COMPLETE SPECIFICATION.
Certain Improvements in and connected with Safety Oil Lamps.
1, GEORGE HENRY LESTER, of Midland Metal Works, Coventry, Warwickshire,
Works Manager, 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 :--
This invention bas reference more particularly to those oil lamps in which the air to
feed the flame passes up through a space or spaces between the oil vessel and the out-
side casing of the lamp thereby keeping the oil vessel cool. Heretofore in this class
of lamp a fan operated by clock-work or other mechanical means has been used to force
the air up the said passages to feed the flame and a large and brilliant flame has
resulted; but by my invention I obtain a flame of equal luminosity without the
employment of clock work or other mechanism thereby considerably reducing the cost
of the lamp.
I will describe my invention by referring to the accompanying drawing on which
Fig. 1 represents in sectional elevation a lamp embodying my invention;
Fig. 2 is a front view and
Fig. 3 a side view of the upper part of the wick tube of the same separately.
a is the base or outside casing of the lamp made with an upper removal part a' as
usual, 6 is the oil vessel, c is the wick tube and d is the glass chimney.

page_text: For the purposes of this invention I employ a flat wick but instead of making both
sides of the wick tube e the same height and the top of the wick tube straight or nearly
straight as is usual, I make one side c higher than the other side c² and I curve this
higher side c¹ as shewn in Fig. 2 to the shape of the top of the wick when burning so
that the curved top c¹ will form a guide for cutting or rubbing the wick to the proper
shape. By this means I ensure a flat flame of uniform shape along the top as shewn.
The glass chimney d, which is of ordinary bulbous shape curving upwardly to a smaller
hole at the top has to be of about the shape and size relatively to the wick tube c
represented on the drawing so as to give the proper speed for the air past the flame
to ensure thorough combustion.
The arrows shew the direction of the air round the oil vessel to the flame.
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. The improved wick tube for oil lamps hereinbefore described and illustrated by
the accompanying drawing having the top of one side curved and higher than the other
side substantially as and for the purpose set forth.
2. In a safety oil lamp in which air to feed the flame passes up through a space or
spaces between the oil vessel and the outside casing of the lamp, the employment of
the improved wick tube c having one higher curved side c¹ in combination with the
bulbous chimney d as hereinbefore set forth and illustrated by the accompanying
drawing.
Dated this 10th day of October 1890.
CHARLES BOSWORTH KETLEY,
Agent for the Applicant.