IMPROVE- MENTS IN OIL LAMPS TO BE USED WHERE THERE ARE CURRENTS OF AIR PRODUCED BY PUNKAHS OR OTHERWISE ㄌ PROVISIONAL SPECIFICATION
Year: 1883

page_text: LETTERS PATENT to John Fyfe, Managing Director of Young's Paraffin
Light and Mineral Oil Company Limited, of Glasgow, in the County of
Lanark, and Thomas Baker Smith, General Foreman, of Lamp Works, of
Birmingham, in the County of Warwick for an Invention of "IMPROVE-
MENTS IN OIL LAMPS TO BE USED WHERE THERE ARE CURRENTS OF AIR
PRODUCED BY PUNKAHS OR OTHERWISE
ㄌ
PROVISIONAL SPECIFICATION left by the said John Fyfe and Thomas
Baker Smith at the Office of the Commissioners of Patents on the
2nd May 1883.
JOHN FYFE, Managing Director, of Young's Paraffin Light and Mineral Oil
Company Limited, of Glasgow, in the County of Lanark, and THOMAS BAKER
SMITH, General Foreman, of Lamp Works, of Birmingham in the County of
Warwick, "IMPROVEMENTS IN OIL LAMPS TO BE USED WHERE THERE ARE
CURRENTS OF AIR PRODUCED BY PUNKAHS OR OTHERWISE
"
This Invention has for its object the constructing of a lamp for burning paraffin
oil, or other suitable oil, in an improved manner, so that the steady burning of the
light may not be appreciably affected by the action outside the lamp of strong
currents of air such as are produced by punkahs.
The improved lamp is provided with an external glass shade of a suitable
ornamental form, a conoidal shape being preferred having its wider part at the
bottom. The shade is carried on a metal gallery of which the bottom is perforated
and covered with wire gauze; and the air can enter in an upward direction
through the perforations and wire gauze into the internal space between the shade
and the chimney with which latter the lamp is provided in the usual way. The
air, which cannot enter by any other way has to get round and over a flaring
annular flange or baffling ring which is fixed to the inner part of the perforated
gallery and which is curved outwards so as to extend partly over the perforations
D..dll

page_text: and wire gauze. The air to feed the flame descends between the flaring flange and
an inner gallery or ring which holds the chimney, and thence passes between the
bottom case (which is unperforated) and ribs supporting the cone and chimney,
and has access between these ribs and through the ordinary perforated diaphragm
to the interior of the cone and to the wick or wicks. An ornamental metal cap is
fitted upon the top of the shade and is constructed in an improved manner so as
to prevent external air currents from interfering with the steady outflow of the
heated gaseous products of combustion. At the lower part of the cap there is
internally a ring or annular flange of a flaring form with its upper part the wider,
and this flange which is perforated for the egress of the heated air and gases or
a large portion of them is protected by an external ornamental case open below
and having its bottom part flaring outwards. The cap extends above the perforated
flange and has an outlet at its upper end protected by an upper small cap of an
external convex form. Inside of the upper part of the cap there is provided for
baffling any downwardly tending currents, a hemispherical plate which is fixed
with its convex part downwards and so as to allow only a small passage between
its edge and the internal surface of the cap.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said John Fyfe and Thomas Baker Smith in the Great Seal Patent
Office on the 31st October 1883.
JOHN FYFE, Managing Director of Young's Paraffin Light and Mineral Oil
Company Limited, of Glasgow in the County of Lanark, and THOMAS BAKER
SMITH, General Foreman of Lamp Works, of Birmingham in the County of
Warwick " IMPROVEMENTS IN OIL LAMPS TO BE USED WHERE THERE ARE
CURRENTS OF AIR PRODUCED BY PUNKAHS OR OTHERWISE
"
Our said Invention has for its object the constructing of a lamp for burning
paraffin oil, or other suitable oil, in an improved manner, so that the steady
burning of the light may not be appreciably affected by the action outside the
lamp of strong currents of air such as are produced by punkahs.
An example of our improved lamp is shown in vertical section in the accom-
panying explanatory drawing. The base, 1, oil vessel, 2, wick tubes, 3, burner
cone or dome, 4, and chimney, 5, may be of forms similar to those of existing
paraffin or other oil lamps as made for ordinary use. The wick tubes, 3, are fitted
with the usual pinions for moving the wick, and may be fitted with appliances
for extinguishing the light, but such minor details are not shown in the drawing.
The lamp is provided with an external glass shade, 6, of a suitable ornamental
form, a conoidal shape, such as is shown in the drawing, being preferred, having
its wider part at the bottom. The shade, 6, is carried in a metal gallery, 7, of
which the bottom, 8, is perforated and covered with wire gauze; and the air can
enter in an upward direction through the perforations and wire gauze into the
internal space, 9, between the shade, 6, and the chimney, 5. The air which cannot
enter the lower part of the lamp by any other way, has to get round and over a
flaring annular flange or baffling ring, 10, which is fixed to the inner part of the
bottom, 8, of the gallery, and which is curved outwards so as to extend partly over
the perforations and wire gauze. The air to feed the flame descends between the
flaring flange, 10, and an inner gallery or ring, 11, which holds the chimney, 5,
and thence passes between the bottom outer case, 12, (which is unperforated) and
ribs, 13, supporting the cone or dome, 4, and chimney, 5, and has access between
these ribs and through the ordinary perforated diaphragm, 14, to the interior of
the cone, 4, and to the wick or wicks. An ornamental metal cap, 15, is fitted
upon the top of the shade, 6, and is constructed in an improved manner, so as to
prevent external air currents from interfering with the steady outflow of the
heated gaseous products of combustion. At the lower part of the cap, 15, there
s internally a ring or annular flange, 16, of a flaring form with its upper part the
wider, and this flange, 16, which is perforated for the egress of the heated air and
gases or a large portion of them, is protected by an external ornamental case, 17,
open below and having its bottom part flaring outwards. The cap extends above
be perforated flange, 16, and has an outlet, 18, at its upper end protected by an
apper small cap, 19, of an externally convex form. Inside of the upper part, 15,
f the cap there is provided for baffling any downwardly tending currents, a
emispherical plate or shell, 20, which is fixed with its convex part downwards,
nd so as to allow only a small passage between its edge and the internal surface
f the cap for the ascent of the heated gases.
Having thus particularly described our said Invention and the manner of
erforming the same we have to state that we do not restrict ourselves to the
recise details herein described and delineated but that what we believe to be

page_text: novel and original and claim as the Invention secured to us by and in terms
of the hereinbefore in part recited Letters Patent is :—
The construction of those parts of oil lamps on which the ingress of air and the
egress of heated gases depend substantially in the improved manner and for the
purposes herein before described.
In Witness whereof I, the said John Fyfe, on behalf of myself and of the
Baid Thomas Baker Smith, have hereunto set my hand and seal this thirtieth
day of October in the year of our Lord One thousand eight hundred and eighty-
three.