Improvements in Gas Lamps for Stair Cases and other Places.
Year: 1887

page_text: Date of Application, 24th Oct., 1887
Complete Left, 14th Apr., 1888
Complete Accepted, 18th May, 1888
PROVISIONAL SPECIFICATION.
Improvements in Gas Lamps for Stair Cases and other Places.
I, JAMES WALKER of 13 Cochrane Street, Dundee, in the County of Forfar,
Estate Agent, do hereby declare the nature of this invention to be as follows:-
This invention has for its object a gas lamp which shall give a good light with a
small flame, and is specially valuable for stair cases & other places requiring light
sufficient for people to find their way, avoid obstacles etcetera, but which is not
required for reading by. On an ordinary gallery and burner tube I place a small
central-hole-burner; and in the gallery over the cross bars I place a zinc or other
plate, with hexagonal or other angular periphery, or having spaces left round the
edge for air to enter but otherwise filling the space between the burner or centre tube
and the gallery proper.
I also prefer to leave a round hole in the plate at one point for the insertion of a
taper in lighting.
On the gallery I place a glass chimney splayed out at base to fit the gallery & be
fastened by the usual screws but rapidly lessening in diameter by an upward curve
to preferably about an inch and a quarter in diameter continuing parallel for about
five inches till close to the top and then narrowing in to an inch internal dameter.
This form of glass chimney combined with the plate with orifices or hiati for
air almost exclusively round its circumference causes a series of currents of air to
be projected inward into the flame and thus forms a very vivid combustion & bright
light without smoke.
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33 1
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page_text: Figure 2 a plan of my improved lamp.
On an ordinary gallery A, and burner tube B, I place a small central hole burner C,
and in the gallery over the cross bars a, I place a plate D, preferably of glass, though
it may be of zine or other material. This plate may have a hexagonal or other
angular periphery, or it may have spaces left round the edge for air to enter, but
otherwise it would fill the space between the burner or centre tube B and the gallery
proper A.
When, however, a glass plate is used, I prefer to make it circular, of about the
same size as the gallery, and I form it of glass having shallow ribs or grooves d upon
its surface. A ring a of india-rubber or similar substance preferably inserted
between the lower surface of the glass plate D and the gallery A. The air for com-
bustion finds its way, by reason of the grooves or ribs d, between the upper surface of
the plate D and the lower edge of the chimney E. When thin metallic clips such
as d are used to secure the plate in place, they may be extended below the edge of
the chimney, and serve to raise the latter a short distance above the plate, thus
providing an increased area for the entrance of air to the flame. If preferred, a small
hole may be left in the plate at one point for the insertion of a taper in lighting, but
usually it will be found sufficient to turn on the gas for two or three seconds, and
apply a light at the top of the chimney.
The glass chimney E which may be protected by wire, if desired, is held in position
as usual by gallery screws a². It is splayed out at the base e to fit the gallery, but it
afterwards lessens in diameter, first, by a rapid upward curve e¹, and then by a gradual
taper to preferably about an inch and a quarter in diameter at a point e³, about one
sixth of its total length from the top. From this point it widens out to, say, about an
inch and a half in diameter.
A plate such as D, having ribs or grooves on its upper surface, or orifices or hiati
on its edge, admits the air to the burner almost exclusively round its circumference,
and when combined with a chimney shaped as aforesaid. A series of currents of air
are projected inward into the flame, thus producing a very vivid combustion and
bright light without smoke.

page_text: 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 :-
1. As a gas lamp for stair cases and other places, the combination with an ordinary
gallery burner tube and central hole burner; of a plate such as D filling the space
between the said tube and gallery, and provided with ribs or grooves on its surface,
or with orifices or hiati at its edge, for the admission of air, and of a chimney such as E
placed upon or immediately above the said plate, and substantially of the shape
described and illustrated.
2. In a gas lamp, the combination with a chimney, substantially of the shape
described and shown, of a plate closing its lower end, but provided with orifices,
grooves, or their equivalent, for the admission of air at its edges; whereby the said
air is projected inwards into the flame and a very vivid combustion produced without
smoke.