provements in Incandescent Oil Lamps.
Year: 1898

page_text: Date of Application, 11th June, 1898-Accepted, 10th Sept., 1898
COMPLETE SPECIFICATION
Improvements in Incandescent Oil Lamps.
We, JOHN HERSEY, Gas Engineer, and MAXIMILIAN HERSEY, Journalist, both
of Cambridge Cottage, Wood Green, N, 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:-
This invention relates to improvements in incandescent oil lamps in which the
oil is burnt from an ordinary wick and the flame directly heats an incandescent
mantle or other sunular body, the object of the invention being to so arrange
the hot and cold air curients that an equal quantity of each 18 led to the mantle
and the lamp acts in a similar manner to an ordinary Bunsen burner
For this purpose the burner consists of a vertical and parallel circular wick-
tube formed with an enlarged base or chamber provided with an opening for
admitting air to the interior of the tube
This stream of air is heated in its passage through the tube and passes up, on
the inside of the flame, to the interior of the incandescent mantle supported above
the burner Surrounding the wick-tube is a hollow cone which leads the air
upwardly outside the said tube from whence it is deflected downwardly and up
through perforations to the exterior of the mantle
This second stream of air is partly heated by the outer surface of the wick-
tube, and a third stream of cold an 19 also led through perforations in the gallery,
to the exterior of the mantle thus keeping the burner and oil reservoir perfectly
cool and preventing the possibility of explosions
By this arrangement of hot and cold an streams the required amount of oxygen
is fed to the burner for producing a perfectly blue flame in a similar manner to
an ordinary Bunsen burner, the cool or cold air is kept from the interior of the
mantle, and the life and efficiency of the latter is increased
And in order to fully understand the said invention reference is made to the
accompanying sheet of diawings in which Fig 1 is an elevation and Fig 2 a
vertical section of the upper part or burner of the lamp
a is the wick-tube formed with the enlarged base or chamber a¹ provided with
an opening a, b is the hollow cone surrounding the tube a and supported by
the gallery or frame c
The upper part of the cone forms with the tube a, a small annular opening b¹
through which the air drawn in through the perforations
passes
The interior of the burner is formed with a rim d against which the air,
passing through the opening b₁ impinges and 18 deflected downwards so as to
pass through the perforations 3 and up around the exterior of the mantle e which
rests upon the top of the burner and is supported by the rod e¹
The gallery, or frame c is likewise provided with perforations
and the perforations cold air passes to the exterior of the mantle
The central tube f through which the wick-raising rack 9 passes supports a
cap-shaped spreader the required distance above the top of the wick-tube.
The operation of the improved lamp is as follows:-
-
through which,

page_text: The heat of the flame draws air through the perforations c¹ into the interior
of the wick-tube a by means of the opening as in the base of the latter.
The said air is heated in its passage through the tube and travels up and is
forced by the spreader h against the inner surface of the flame and into the
interior of the mantle e Air 16 also simultaneously drawn through the per-
forations up through the interior of the cone 6 and annular opening b¹.
This second stream of air is slightly heated by contact with the exterior of the
wick-tube a and impinges against the rim d which deflects it downwards and
up through the perforations to the exterior of the mantle.
A third current of air is also drawn through the perforations and cup
through the chimney to the exterior of the mantle, and this current remaining
cold keeps the burner and oil reservoir perfectly cool, whilst providing, in con-
Junction with the other air currents, or streams, the necessary amount of oxygen
to the burner to create a blue flame
The wick-tube is preferably formed so that the wick fits compactly therein
whereby the wick is slightly compressed and its life and efficiency increased, and
instead of using an ordinary wick the lamp may be fitted with what is commonly
known as the consistent wick, that is whose upper or burning portion 18
formed of a separate ring of highly compressed cotton which rests upon the top of
the ordinary wick feeding the oil to the said ring
4.
This improved lamp obviates the disadvantage of similar lamps hitherto in
use in dispensing with gas waste rings and preventing a greater use of petroleum
or other oil than is necessary for the production of the light
The light also does not intermittently grow or diminish in power and conse-
quently requires little attention, it is also perfectly noiseless and does not
produce soot.
It has been found that one pint of petroleum will burn for about 24 hours and
the lighting power is superior to that of similar lamps heretofore constructed
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what
we claim 18:-
(1) The improvements in incandescent oil lamps comprising the application
of an inner hot air current, an intermediate and slightly warmed air current,
and an outer cold air current acting upon the flame of the burner in the manner
and for the purposes substantially as described
(2) In an improved incandescent oil lamp the combination of the wick-tube a
in which the wick compactly fits and which is formed with an enlarged base n¹
provided with an opening a for feeding hot air to the interior of the flame, the
hollow cone 6 surrounding the wick-tube and forming with the same the annular
opening b¹ the perforations of in the gallery or frame for feeding air to the
wick-tube a and cone 6 the rim d for deflecting the air from the cone 6 to the
outside of the mantle e the perforations c³, c³, for feeding the air currents to
the outside of the mantle, and the tube f for supporting the spreader h substan-
tally as described
(3) The improved incandescent oil lamp substantially as described and shewn
in the accompanying sheet of drawings
111 1
•
1000
J B FLEURET,
6, Hatton Garden, Holborn Circus, London, W.C.,
Agent for the Applicants.