An Improvement in Overhead Gas Lamps for Railway Carriages and like situations.
Year: 1897

page_text: Date of Application, 4th May, 1897
Complete Specification Left, 4th Feb., 1898-Accepted, 5th.Mar., 1898
PROVISIONAL SPECIFICATION,
An Improvement in Overhead Gas Lamps for Railway Carriages and
like situations.
I, WILLIAM HENRY ISAAC WELCH, of No. 68, Coborn Road, Bow, in the County
of London, Lamp Manufacturer, do hereby declare the nature of this invention
to be as follows:-
My invention relates to means of rendering the combustion of the gas flame or
flames of a railway carriage or other overhead lamp more complete and brilliant
than usual. I effect this by carrying down through the reflector into the globe
space, not only the gas pipe, but also an air pipe which surrounds the gas pipe,
being eccentric to it, so that the passage for air is almost entirely along the upper
side of the gas pipe. The air descending along this passage, from the chamber
above surrounding the chimney, and being- heated as it passes through this
chamber, plays upon the upper side of a horizontal flat flame rendering the com
bustion complete and brilliant.
Instead of a single flame there may be two on the same plane, on both of which
the air current plays, and in this case there may be two air pipes one for each
burner. The air for the underside of the flame or flames is supplied to the globe
space in the usual way by holes through the reflector, from the space above it.
+
Dated this 4th day of May 1897.
ABEL & IMRAY,
Agents for the Applicant.
An Improvement in Overhead Gas Lamps for Railway Carriages and
like situations.
I, WILLIAM HENRY ISAAC WELCH, of 68, Coborn Road, Bow, in the County
of London, Lamp Manufacturer, 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 means of rendering the combustion of the gas flame or
flames of a railway carriage or other overhead lamp more complete and brilliant
than usual. I effect this by delivering heated air directly on the flame as I shall
describe referring to the accompanying drawings.
-
Fig. 1 is a section of a lamp having a flat flame burner with air supply according
to my invention, Fig. 2 is a part plan on the line 2-2 of Fig. 1; Fig. 3 is a part
section shewing an Argand burner with central air supply and Fig. 4 is a trans-

page_text: verse section shewing two flat flame burners with air supply. I carry down
through the reflector R into the globe space G not only the gas pipe B, but also
an air pipe A which partly surrounds the gas pipe, being eccentric to it, so that
the passage for air is almost entirely along the upper side of the gas pipe. The
air enters by perforations at the base of a dome C, ascends the annular space
between C and an inner dome D) and descends through perforations at the upper
part of into the space surrounding the base of the chimney E, passes thence
through perforations into an annular space F whence it flows through perforations
into the air pipe A. The air thus heated plays upon the upper side of the
flame H rendering the combustion complete and brilliant.
As shewn in Fig. 3 the heated air may be supplied to the interior of an Argand
burner.
Instead of a single flame there may be two as shewn in Fig. 4 on both of which
the air current plays. Burners giving other numbers of Hames may obviously
be employed. The air for the underside of the flame or flames is supplied to the
globe space G in the usual way by holes K, from the space above the reflector.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is:-
1. In an overhead gas lamp, in combination with the gas pipe entering the
globe space, a pipe or passage conducting to the flame air heated by its passage
through spaces and metal surrounding the chimney, substantially as described.
2. An overhead gas lamp constructed and operating substantially as described
with reference to the drawings.
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