Improvements in Overhead Recuperative or Regenerative Gas Lamps.
Year: 1895

page_text: Date of Application, 11th Apr., 1895-Accepted, 1st June, 1895
COMPLETE SPECIFICATION.
Improvements in Overhead Recuperative or Regenerative
Gas Lamps.
I, CHARLES ARTHUR ALLISON, of 52 Chancery Lane, London, Chartered
Patent Agent, do hereby declare the nature of this invention (which has been
communicated to me from abroad by Messrs. Charles Assi and Louis Genès, of
6 Rue du Havre, Paris, France, Patent Agents) and in what manner the same is
to be performed, to be particularly described and ascertained in and by the
following statement :-
This invention relates to that class of overhead lamps in which a central burner
is employed and in which heated air is supplied to the under and also the upper
side of the flame of such burner, such invention being especially applicable to
railway carriage lamps.
The essential feature of the present invention consists in the employment of a
conical chamber or tube tapering from the top downwards and through which the
central gas pipe passes, such chamber being open at the bottom and below it the
burner is arranged, while it is closed at the top, but near the top is provided with
one or more radial passages or openings communicating with a chamber or passage
to which air from the outside of the lamp case is admitted, the products of
combustion from the Hame preferably passing up the chimney through a space
left between the conical chamber or tube and the outer chamber or passage last
referred to.
In the accompanying drawings
Fig. 1 is a vertical section showing a suitable method of applying the invention
to existing railway carriage lamp casings by inserting the lamp from above into
the ordinary casing carrying the glass, and
Fig. 2 a plan view of same.
Fig. 3 is a vertical section showing the application of the invention to a new
lamp, such arrangement comprising also a slight modification of the air passages.
Referring to Figs. 1 and 2, A is the gas pipe which passes down the centre of
the lamp and terminates in the burner B. Surrounding the vertical part of such
pipe is a conical chamber or tube C. tapering from the top downwards, the bottom
of same being open and below which the burner B is situated. The top of the
chamber C is closed as shown, while near such top one or more (preferably three)
radial openings or passages Dare provided and communicate with an air chamber É
of annular form, the outer wall of which is provided with perforations e. Air
enters the outer casing F of the lamp at F', and passes into annular chamber E
through the perforations e, thence through the radial passages or openings D into
the conical chamber C and down to the top of the flame of the burner B. A portion
of the air also passes down outside the chamber E through perforations in a plate G,
which supports such chamber, and so to the underside of the flame. The products
of combustion pass up to the chimney H through the space I between conical
chamber C and air chamber E.
The top of the lamp is preferably hinged so that it can be turned back to ignite
the lamp, while for cleaning the lamp glass K, the heating chamber and reflector
can be removed from above, by turning same back on the hinge joint A' of the gas
pipe A.
In the arrangement shown in Fig. 3 the lamp glass K is hinged at K¹, so that

page_text: same can be opened from inside the carriage for cleaning, and also for lighting if
desired, or the top of the lamp F may be hinged for the purpose of ignition.
In this arrangement further the air, chamber E is replaced by a set of rings or
baffles E, E, E³ arranged to form a sinuous passage for the air current to pass
through on its way to the conical tube C to supply the necessary heated air to the
inner side of the flame, a part of such air also passing from inside ring E' through
openings in plate G to the underside of the flame.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is:-
In a recuperative or regenerative lamp.
1. The combination with a central gas pipe terminating in a burner at the
bottom, of a conical chamber or tube tapering from the top downwards and
provided with a radial opening or radial openings at or near the top communicating
with an air chamber or passage to which air from the outside of the lamp casing is
admitted, all substantially as specified.
2. The combination with a central gas pipe terminating in a burner at the
bottom, of a conical chamber or tube tapering from the top downwards and
provided with a radial opening or radial openings at or near the top communicating
with an air passage formed by a series of rings or baffles to which air from the
outside of the lamp casing is admitted.
1
1100
ALLISON BROS.,
Agents for the Applicant.