Improvements in Glasses or Chimneys for Lamps or Burners for Lighting or Heating Purposes.
Year: 1894

page_text: Date of Application, 6th Apr., 1894
Complete Specification Left, 7th Jan., 1895-Accepted, 2nd Mar., 1895
PROVISIONAL SPECIFICATION.
Improvements in Glasses or Chimneys for Lamps or Burners for
Lighting or Heating Purposes.
We CHARLES FITZROY ALEXANDER HALLIFAX BAGOT of 59 Cadogan
Square in the County of London Esquire and JOHN CHARLES CRAMPIN READ
of 8 Lordswood Road, Harborne in the County of Stafford Engineer do hereby
declare the nature of our invention to be as follows:-
The object of this invention is to provide a glass or chimney for lamps or burners
more especially for mineral oil lamps of the kind described in the Specification of
Letters Patent No. 23386 dated 19th December 1892 granted to John Hodgson
Lee but applicable to other lamps or buruers for lighting or heating purposes by
the use of which glass or chimney a very efficient flame is produced.
The glass or chimney constructed according to this invention consists of a base
or lower portion in which the top of the burner is situated and which is inserted
into the holder or gallery of the lamp the glass or chimney is then contracted and
afterwards expanded into a somewhat spherical form to constitute the flame
chamber in which the spreader or button is situated and is then again contracted
and afterwards expanded again and continued for the necessary extent upwards.
The proportions of the various parts are such as to give when the glass or chimney
is used upon a lamp or burner the requisite supply of air and direction of the
flame. The following description with reference to the accompanying diagram
explains the method of setting out a glass or chimney having the proportions which
give the best results in practice.
The diameter of the burner is presumed to be from a to b on the base line.
Bisect a band draw c d perpendicular thereto. Lay off on either side of a b
one quarter of the length of that line which gives the width for the main draft
channel e j
Lay off beyond these points ef another quarter of the length
of the line a b which gives the width for the base of the glass or chimney gh.
Lay off beyond the points gh another quarter of the length of the line ab which
gives the greatest diameter (ij) of the flame expansion chamber. From the
points a bef g h and ij draw lines parallel to c d. Make c k equal to c g or ch.
Through k draw 1 km parallel to g h which will give the points 12 and m² as
terminals of impinge equal to the main draft of the glass or chimney. Draw the
lines cg and c 2 and bisect them which will give the centres y³ and h³ for the
shoulders g 12 and 4 m². Join ee and ff giving, where they intersect,
the point through which draw gn 1 parallel to g h. This gives 9 and 14
as terminals for the vertical section of the base of the chimney. Join 9 I'
and hand make k p equal to ck. Then p will be the centre of maximuin
diameter for the flame expansion chamber. Through p draw 2p parallel
to a b. From the centres g² and h² draw the lines 9² 9 and h³ q equal to g³ m² or h³ 12.
Produce 929 and h² q until they bisect the lines e and f respectively at r and .
Through draw² 3 parallel to a b giving r² as the limits of the first retractive
curves and s² of which gq is the common centre. Produce e e and ƒƒ' until
they intersect p m and plgiving t and u as centres of the second retractive
curves and s² w. Draw w parallel to g h giving the points w and vas
terminals of the second impinge equal to the diameter of the burner. Join s w

page_text: and and produce these lines to intersect in giving as the common centre
of the expansion shoulders w² and v³. Make y equal to cx and make y d
equal to cp and draw through d a line for the top of the glass or chimney parallel
with a b. Join ² z and 2 by lines parallel to c d. The thick line shews the
section of a glass or chimney thus formed.
A glass or chimney thus formed gives the best effect when used with a lamp
having a burner with its top in the plane of the line 1. 2 and with a spreader or
button situated at or about the plane of the line 3. 4.
Dated this 6th day of Avril 1894.
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fielde, London, W.C., Agents.
Improvements in Glasses or Chimneys for Lamps or Burners for
Lighting or Heating Purposes.
We CHARLES FITZROY ALEXANDER HALLIFAX BAGOT of 59 Cadogan
Square, in the County of London, Esquire and JOHN CHARLES CRAMPIN READ,
of 8 Lordswood Road, Harborne, in the County of Stafford, Engineer, 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 :-
The object of this invention is to provide a glass or chimney for lamps or burners
more especially for mineral oil lamps of the kind described in the Specification of
Letters Patent No. 23386 dated 19th December 1892 granted to John Hodgson
Lee but applicable to other lamps or burners for lighting or heating purposes, by
the use of which glass or chimney a very efficient flame is produced. The glass or
c'imney constructed according to this invention consists of a base or lower portion
in which the top of the burner is situated and which is inserted into the holder or
gallery of the lamp the glass or chimney is then contracted and afterwards
expanded into a somewhat spherical form to constitute the flame chamber in which
the spreader or button is situated and is then again contracted and afterwards
expanded again and continued for the necessary extent upwards. The proportions
of the various parts are such as to give when the glass or chimney is used upon a
lamp or burner the requisite supply of air and direction of the flame.
The following description with reference to the accompanying diagram explains
the method of setting out a glass or chimney having the proportions which give
the best results in practice. The diameter of the burner is presumed to be
from a to b on the base line. Bisect a band draw cd perpendicular thereto. Lay
off on either side of a one quarter of the length of that line which gives the
width for the main draught channel ef. Lay off beyond these points ef another
quarter of the length of the line ab which gives the width for the base of the glass
or chimney 2
h. Lay off beyond the points gh another quarter of the length of
the line ab which gives the greatest diameter (ij) of the flame expansion chamber.
From the points a b, e f g h and ij draw lines parallel to cd.
Make ck equal
to cg or ch. Through drawk m parallel to ab which will give the points l
and m³ as terminals of impinge equal to the main draught of the glass or chimney.
Draw the lines c g² and ch² and bisect them which will give the centres g³ and h
for striking the curve of the shoulders 9 12 and h m². "Join e e² and ff giving,
where they intersect, the point n through which draw g' n h parallel to a b. This
gives g* and * as terminals for the vertical section of the base of the glass or
chimney. Join g g and h h and make k p equal to ck. Then p will be the centre
of maximum diameter for the flame expansion chamber. Through p draw p
parallel to a b. From the centres g² and h draw the lines gfy and equal

page_text: until they bisect the lines e and f
parallel to a b giving as the
2 of which 9 is the common centre.
to m² or h³ 12. Produce ² 9 and 12 7
respectively at rands. Through s draw
limits of the first retractive curves 22 and
Produce e e and ff until they intersect pm and pl giving t and as centres of
the second retractive curves and $2 w. Drawo parallel to a b giving the
points w and as terminals of the second impinge equal to the diameter of the
burner. Join swand² and produce these lines to intersect in c d giving as
the common centre of the expansion shoulders w² and. Make ay equal to c <<
and make y d equal to ep and draw through d a line for the top of the glass or
chimney parallel with a b. Join and by lines parallel to c d. The thick
line shews the section of a glass or chimney thus formed.
A glass or chimney thus formed gives the best effect when used with a lamp
having a burner with its top in the plane of the line 1, 2 and with a spreader or
button situated at or about the plane of the line 3, 4.
It is preferred to proportion the spreader or button so that the diameter of the
top shall be slightly larger than that of the burner of the lamp as shewn by the
line 3-4 the size being defined by drawing lines between 9 and ha and
between e³ and f. The points where these lines intersect give the main diameter
and position relatively to the glass or chimney of the spreader or button. The
intersection of the lines drawn from 3 to 12 and from 93 to m² give the most
advantageous position for the top of the burner relatively to the glass or
chimney.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is:-
For oil lamps having circular or annular wicks a glass or chimney constructed
substantially as herein before described with reference to the accompanying
diagram.
Tonno 190%
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, W.C., Agents.