A New or Improved Lamp Chimney or Globe or Covering for any kind of Light.
Year: 1894

page_text: Date of Application, 5th Dec., 1894
Complete Specification Left, 1st Feb., 1895-Accepted, 9th Mar.,
1895
PROVISIONAL SPECIFICATION.
A New or Improved Lamp Chimney or Globe or Covering for any
kind of Light.
I, JOHN LAMB, of 41 Wilson Street, Middlesbrough, in the County of York,
Watchmaker, Jeweller and Optician, do hereby declare the nature of this invention
to be as follows:-
My invention relates to a new or improved lamp chimney, or globe, or covering,
to be used for gas burners, oil burners, or any other kind of burner or light.
The chimney, or globe, or covering is made with a longitudinal slit the full
length, or slit, or slits part of the length of the chimney, or globe, or covering. In
cases where the slit is made the full length of the chimney, or globe, or covering,
the joint can be made either to butt, or overlap. The chimney, or globe, or
covering can be made in two longitudinal pieces, and can be fixed together by a
metallic, or any kind of ring, or rings suitable, to be placed in any necessary
position, or positions for holding the two pieces together.
The two pieces can also be made to overlap and clasp each other, thus holding
together without the aid of metallic, or other rings, although the said rings may
be used in addition, if considered necessary.
Dad thin Waunth day of December 1894.
JOHN LAMB.
A New or Improved Lamp Chimney or Globe or Covering for any
kind of Light.
I, JOHN LAMB, of 41 Wilson Street, Middlesbrough, in the County of York,
Watchmaker Jeweller and Optician, 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 a new or improved lamp chimney, globe, or covering to
be used for gas burners, oil burners, or any other kind of burner or light, and the
object of my said invention is to provide, in the construction of articles of this
nature, improved means for permitting of their expansion or contraction by change
of temperature, thereby reducing the liability of their breaking, from such cause,
to a minimum.
In carrying the invention into practice, the chimney, globe, or covering is made
with a longitudinal slit the full length, or a slit or slits part of its length. In
cases where the slit is made the full length of the article, the edges of the said slit
can be made either to butt or overlap.
As a modification, the chimney, globe, or covering can be made in two distinct
longitudinal pieces, which said pieces can be fixed together by a metallic, or other
suitable kind of ring, or rings, placed in any necessary position, or positions for
this purpose. The two said pieces may also be made to overlap and clasp each
other, thus being held together without the aid of rings or other separate devices,
although the said rings may be used in addition, if considered necessary or
THE

page_text: In the accompanying sheet of drawings, which forms part of this Specification,
and in which similar letters of reference denote similar parts throughout;
Fig. 1 represents, in elevation and plan, an ordinary straight glass chimney,
constructed in accordance with one method of carrying my invention into practice.
Figs. 2, 3, 4 and 5 represent similar views of similar chimneys, illustrating
respectively modifications of my invention.
66
In Fig. 1, A is an ordinary straight glass chimney, of the kind commonly used for
Argand" gas burners, it has a slit B extending its whole length from top to
bottom, such slit may be cut after the chimney has been made, or may be formed
in any other suitable way. In this case the edges of the slit butt closely against
each other.
In Fig. 2, A is a similar chimney with a similar slit, but with the difference that
the edges of the slit overlap instead of forming a butt joint.
In Fig. 3, A is a similar chimney with two slits B, B' opposite to each other.
These slits commence at one end of the chimney and extend to within a short
distance of the other end, where they each terminate in a small hole C, to prevent
the slits extending when the chimney is heated or cooled.
In Fig. 4 a similar chimney is shewn, constructed in two separate longitudinal
halves A, and A', the edges butt together, forming two slits B, B', and the halves
of the chimney are held together by two rings D, D, of metal, or other suitable
material, slipped one over each end.
In this case the chimney may be made in the ordinary way and then cut in half.
Lastly in Fig. 5, a similar chimney is shewn constructed in two separate longi-
tudinal halves A and A', but in this case the edges E, E, of one half are bent
out sharply at right angles to the chimney, while the edges F, F of the other half
are bent out in a similar way and then back again to embrace, or clamp the
edges E, E, as shewn clearly in the plan, thus holding the two parts of the chimney
firmly together without the aid of rings D, D, as in Fig. 4, though suitable rings
may be employed in addition, if so desired.
In the five forms of chimney thus illustrated and described, ample provision is
made for expansion and contraction due to change of temperature, without straining
or breaking the chimney.
The said five drawings clearly illustrate the principle of my invention, and
although the chimneys shewn are all only ordinary straight chimneys, it will readily
be understood that chimneys of curved, or other forms, globes, or other coverings
for burners or lights, can be constructed in a similar manner, and in some cases
where butt joints are employed, it is not always necessary that the edges of the
joints should be in actual contact.
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. In a lamp chimney, globe or other like article, a slit or slits arranged sub-
stantially as and for the purpose herein set forth.
2. A lamp chimney, globe, or other like article, constructed in two parts,
substantially as and for the purpose herein set forth.
3. A lamp chimney, globe, or other like article A, having a longitudinal slit B,
with butt edges extending the whole length of the article, substantially as and for
the purpose herein set forth, with reference to Fig. 1 of the accompanying drawings.
4. A lamp chimney, globe, or other like article A, having a longitudinal slit B,
with overlapping edges, extending the whole length of the article, substantially as
and for the purpose herein set forth, with reference to Fig. of the accompanying
drawings.
5. A lamp chimney, globe, or other like article A, having two longitudinal
slits B, B with butt edges, extending nearly the whole length of the article,
substantially as and for the purpose herein set forth, with reference to Fig. 3 of
the accompanying drawings.

page_text: 6. A lamp chimney, globe, or other like article, constructed in two longitudinal
parts A, A with butt joints B, B' and united by rings D, D, substantially as and
for the purpose herein set forth, with reference to Fig. 4 of the accompanying
drawings.
7. A lamp chimney, globe, or other like article, constructed in two longitudinal
parts A, A', having the edges E, E embraced or clamped by the edges F, F,
substantially as and for the purpose herein set forth, with reference to Fig. 5 of the
accompanying drawings.
Dated this 1st day of February 1895.
AMBROSE MYALL,
2, Lancaster Place, Strand, London, W.C., Agent for the Applicant.