LAMPS FOR BURNING PARAFFINE OIL OR OTHER LIQUIDS."
Year: 1877

page_text: PROVISIONAL SPECIFICATION left by Robert Tebbs at the Office of the
Commissioners of Patents on the 2nd May 1877.
ROBERT TEBBS, of Stepney, in the County of Middlesex.
LAMPS FOR BURNING PARAFFINE OIL OR OTHER LIQUIDS."
"IMPROVEMENTS IN
My improvements have special reference to lamps with flat wicks, the point of
combustion of which is surrounded by an inner and an outer cone, and for which
no chimney is required.
In these lamps as usually constructed the inner cone is attached at its lower
edge to the outer cone, the result of which is that the outer cone when the lamp is
burning becomes exceedingly hot, and the heat is communicated to the wick tube
and collar, which is objectionable.
Now according to my Invention the inner cone is not attached at its lower edge
to the outer cone, but is simply suspended at its upper edge at two points, viz, at
the two ends of the usual slot or elongated opening in the outer cone, through
which the flame passes.
I prefer to adopt the following novel mode of attaching the inner cone to the
outer at these two points:-At each of such points I pass through the slot or
elongated opening of the inner cone a tongue on the lower end of a flat piece of
metal of peculiar form, as about to be described, and I rivet or attach this tongue to
the inside of the said inner cone. Above the tongue the flat piece of metal is for a
certain distance made too wide to pass through the slot of the outer cone. Above
this wide portion the said piece is recessed so as just to fit the edges of the said slot
in the outer cone. Above the recess at each side is a projecting lug, and at the top
of the metal piece is a projecting portion. The piece having been riveted to the
inner cone, as above mentioned, and the lugs having been temporarily bent inwards,
the piece is passed through the slot of the outer cone up to what I have called the
wide portion, and the lugs are then bent outwards to prevent the return of the
piece through the said slot, the edges of which now take into the recesses of the said
piece. The projecting portion at the top is then turned down outwards, over, or
riveted to a corresponding projecting portion on the outer cone, so that the inner
cone becomes suspended to the outer. The said projecting portion on the outer cone
is made by turning up the part which is cut out to form the slot. This part in
lamps of this description is generally turned downwards within the cone, where the
[Prine 91

page_text: flame comes in contact with it, which is objectionable. Further, in the portion of
the metal piece which I have called the wide portion I make an aperture to allow
of a current of air at the edge of the flame, which has the effect of keeping the
flame from the metal. Where the portion cut out for the slot of the outer cone is
turned down, as above mentioned (as in the ordinary construction), I produce a
similar effect, that is to say, a current of air at the edge of the flame, by making a
hole in such portion.
In order to collect more air within the cones and create a more rapid current by
increasing the heating surface, I make the inner cone wider at its base than usual,
and considerably longer, in fact as long as the length of the wick tube will permit.
I form several rows of holes round the inner cone to allow the air after having
been heated therein to pass through into the space between the two coues, and
thence to meet the flame, and thereby produce a better combustion.
I also make openings in the outer cone near its base or bottom ring to prevent as
much as possible the said base or ring getting hot, as such heat is communicated
through the metal connections to the wick tube guide, and consequently to the wick
tube and collar. For this purpose it will be found convenient to make the said
base or bottom ring separate from the outer cone, and to connect the two together at
three or four points by claws or feet on the lower edge of the cone, passed through
corresponding holes in the base or ring, and then fixed by turning down, a space or
opening being thus left all round between the cone and the base, except at the
three or four points occupied by the claws.
In some cases I also form a number of perforations in the body of the outer cone,
so that the air in passing through them may tend to cool the cone.