Year: 1886

page_text: I, JOHN BARTLETT of No. 37 Cuthill Road Denmark Hill, in the County of
Surrey, Engineer do hereby declare the nature of this invention to be as
follows:-
My invention relates to that description of gas lamps in which the air supply to
the burners is caused to pass in contact with surfaces heated by the products of
combustion from the flames, so that the air becomes heated to a considerable degree
before coming in contact with the flame. The lamps heretofore constructed on
this principle have the defect that the arrangements provided above or below the
burners for heating the air, as described, cast shadows of considerable extent either
upwards or downwards.
My present improvements have for their principal object to remedy this defect,
and also to heat the air and apply it to the burners more effectually than has
beretofore been done. For this purpose I employ by preference ordinary bat's-wing
or fish-tail gas jets fixed radially on a pendant gas pipe which is surrounded by a
tube through which the air supply passes downwards to the burners, such tube
being formed trumpet mouthed just above the burners, below which is fixed a
shield so arranged that the air passing down the tube, instead of issuing into an
open space above and below the burners as heretofore, issues through an annular
opening formed between the tube and the shield, in which opening are situated the
burners, so that the air supply is caused to impinge directly upon the gas flames
issuing from the burners. The gas jets are, as usual enclosed below by a glass
globe, and above by a hood, so that the products of combustion are caused to pass
up through the enclosed space and to impart their heat to regenerative passages
through which the air supply is conducted into the before mentioned central tube.
But instead of making the hood of opaque material, obstructing the rays of light
directed upwards from the lamp as heretofore, I, according to one arrangement,
construct the hood of number of radiating narrow tubes or passages, the lower
ends of which are open to the outer air, while the upper ends communicate with
regenerative passages leading into the central air tube. These radial air tubes are
at some distance apart and the spaces between them are enclosed at top by pieces
of suitable transparent or translucent material, such as talc, so that the light from
the lamp can pass freely through the hood, the only obstruction thereto being the

page_text: tubular ribs. The air passing up such tubular ribs will become very effectually
warmed before passing into the regenerative passages above and thence into the
central air tube.
According to another arrangement, instead of forming the ribs of the hood
tubular as described I make them to act simply as supports for a double covering
of transparent or translucent material, the space between which constitutes the air
channel for conducting the air supply to the burners.
According to another modification I reverse the action of the tubular or other
air channels in the hood, that is to say, I cause the air to pass into regenerative
passages at the top of the hood, from which it passes downwards in the tubular or
other air passages and issues at the lower end into a circular channel having
openings directly in front of which are arranged the gas burners, so that these are
arranged in a ring round the circumference of the lamp instead of centrally as
heretofore, and thus tend to diffuse the light more efficiently than heretofore.
Each burner is by preference arranged directly below one of the tubular air
passages, so that the air in these is heated directly by radiation from the gas jets,
as well as by the products of combustion. In this case the central air tube is
dispensed with.

page_text: I, JOHN BARTLETT, of No. 37 Cuthill Road, Denmark Hill, in the County of
Surrey, 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:-
My invention relates to that description of gas lamps in which the air supply to
the burners is caused to pass in contact with surfaces heated by the products of
combustion from the flames, so that the air becomes heated to a considerable
degree before coming in contact with the flame. The lamps heretofore constructed
on this principle have the defect that the arrangements provided above or below
the burners for heating the air, as described, cast shadows of considerable extent
either upwards or downwards.
My present improvements have for their principal object to remedy this defect,
and also to heat the air and apply it to the burners inore effectually than has
heretofore been done. For this purpose I employ by preference ordinary bat's
wing or fish tail gas jets fixed radially on a pendant gas pipe which is surrounded
by a tube through which the air supply passes downwards to the burners, such
tube being formed trumpet mouthed just above the burners, the products of
combustion from which are caused to pass up through the enclosed space and to
impart their heat to regenerative passages through which the air supply is
conducted into the before mentioned central tube. But instead of making the
hood of opaque material, obstructing the rays of light directed upwards from the
lamp as heretofore, I, according to one arrangement, construct the hood of a number
of radiating narrow tubes or passages, the lower ends of which are open to the
outer air, while the upper ends communicate with regenerative passages leading
into the central air tube. These radial air tubes are at some distance apart and
the spaces between them are enclosed at top by pieces of suitable transparent or
translucent material, such as tale, so that the light from the lamp can pass freely
through the hood, the only obstruction thereto being the tubular ribs. The air
passing up such tubular ribs will become very effectually warmed before passing
into the regenerative passages above and thence into the central air tube.
According to another arrangement, instead of forming the ribs of the hood
tubular as described I make them to act simply as supports for a double covering
of transparent or translucent material, the space between which constitutes the air
channel for conducting the air supply to the burners.
According to another nodification I reverse the action of the tubular or other
air channels in the hood, that is to say, I cause the air to pass into regenerative
passages at the top of the hood, from which it passes downwards in the tubular or
other air passages and issues at the lower end into a circular channel having
openings directly in front of which are arranged the gas burners, so that these are
arranged in a ring round the circumference of the lamp instead of centrally as
heretofore and thus tend to diffuse the light more effectually than heretofore.

page_text: Each burner is, by preference, arranged directly below one of the tubular air
passages so that the air in these is heated directly by radiation from the gas jets
as well as by the products of combustion. In this case the central air tube is
dispensed with.
DESCRIPTION OF THE DRAWINGS.
Fig. 1 of the drawings shews in vertical section a pendant light constructed
according to my above described invention.
The burners A, which are ordinary bat's wing or fish tail burners, suspended
from the central gas pipe A¹ receive their supply of heated air from the trumpet
mouthed tube B, into which the air passes at the upper end from the radial
regenerative passages C. The outer air passes to these passages through a space D
formed between an inner and outer hood E F surrounding the burner, into which
the air enters at X.
The inner hood E is formed of metal ribs, the spaces between which are filled in
with tale, or other suitable transparent or translucent material, the hood being
attached to the regenerative passages C by means of bayonet joints G. The outer
hood F may either be formed similar to E, or, by preference, it consists, as shewn,
of part of a glass globe, forming a continuation of the half globe F¹ that encloses
the space below the hood. It is supported by studs on the hood E so as to leave
the space X for the entrance of the air, which in passing up through the space D
takes up the beat from the hood E, so as to be already heated to a considerable
degree on entering the passages C.
The inlet of air into these passages and the escape of the products of combustion,
which rise up between the tube B and hood E and between the regenerative
passages C, are regulated by "hit and miss" valves at H and I. K is a metal
shield surrounding the regenerative passages and joining the hood F. L is a
perforated tale shield for equally distributing the air supply as it issues from the
tube B. It will be seen from this arrangement that although the boods E and F
are utilised as regenerative passages for heating the air supply, they do not
materially impede the upward passage of the light, being almost entirely formed
of transparent or translucent material.
Fig. 2 shews a modification of the above described construction adapted as
a pedestal or bracket lamp. In this case the outer hood F is made to correspond
in shape to the inner hood E, and the burners A instead of being carried by
a pendant gas pipe, are carried by the gas pipe A' rising from the support M
forming the attachment for the globe F¹. The other parts are similar to those of
the previous construction.
In both the above described arrangements, the burners A might be replaced by
simple perforations formed in the cap of the gas pipe.
Fig. 3 shews a modification in which, in place of forming the air passages by
means of a space between two transparent hoods, tubular metal passages D are
formed, constituting ribs, the spaces between which are filled in with tale or other
suitable transparent or translucent material. The burner is here shewn with two
sets of jets arranged to impinge upon each other, the air supply being made to
issue both above and below them. The construction is otherwise similar to that
before described.
In the arrangement shewn at Fig. 4, the air supply is made to travel in the
contrary direction to that in the former cases, being made to enter the regenerative
passages C, and after passing a partition therein, to pass downwards in the
passages D, which may either be tubular passages as last described or formed
between two hoods as first described.
At the lower end of these passages the air passes into an annular chamber D¹,
whence it issues into the lamp globe through openings through which project
gas nozzles A fixed on a circular gas pipe A¹ within the chamber D'. By this

page_text: arrangement, the gas jets being distributed round the circumference of the lamp
instead of at the centre, the light is more diffused than in the previous cases.
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:-
1, In a gas lamp the air supply of which is heated by passing through
regenerative passages above the burners, constructing the upper part or hood of
the lamp enclosure wholly or partly of transparent or translucent material in
which are formed passages for the air supply so that the air becomes heated
therein before entering the regenerative passages above, substantially as described.
2, The combination of the gas burners A, air tube B, regenerative passages C,
passages D formed between transparent or translucent hoods E F, arranged and
operating substantially as herein described with reference to Figs. 1 and 2 of the
drawings.
3, The combination of the gas burners A, air tube B, regenerative passages C
and tubular air passages D forming the ribs of a hood, the spaces between which
are filled in with transparent or translucent material, substantially as herein
described with reference to Fig. 3 of the drawings.
4, The combination of the gas jets A, arranged round the periphery of the
lamp, regenerative passages C, air passages D) and annular air chamber D¹ arranged
and operating substantially as herein described with reference to Fig. 4 of the
drawings.
Dated this 4th day of November 1886.
ABEL & IMRAY,
Agents for the Applicant,
28, Southampton Buildings, London, W.C.