Improvements in Hurricane or Tubular Lanterns.
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
Improvements in Hurricane or Tubular Lanterns.
I, JOHN HENRY STONE, of 21 Sultan Street, Toronto, in the Province of Ontario,
in the Dominion of Canada, Manufacturer, do hereby declare the nature of this
invention to be as follows:-
My invention relates to what are known as hurricane or tubular lanterns and
comprises the improvements hereinafter described whereby a lantern with a wick
of a given size will burn much more brightly than a lantern as heretofore con-
structed and having a wick of the same size.
According to my invention I provide means whereby practically pure air is
supplied to the burner instead of partially vitiated air as is usual in lanterns of
this class as hitherto constructed and I also provide for admitting air through the
gallery or plate carrying the globe in a novel manner.
In carrying out my invention I form the head of the lantern with two tubes or
cylinders arranged one within the other and having a space between them for air.
The outer cylinder is fixed to and carried by the usual air tubes whilst the inner
cylinder is adapted to slide in the outer cylinder and at its lower end to fit over
the usual globe or glass of the lantern, whilst at its upper end it projects through
the fixed or outer cylinder and carries a cap at such a distance above it as to permit
the escape of the products of combustion which pass up through the inner cylinder.
The top end of the outer cylinder is formed with a flange which projects inwardly
sufficiently to cover the space between the two cylinders and to form a guide for
the upper end of the inner or sliding cylinder. Another flange is arranged on the
outer cylinder at its lower end in order to guide the lower end of the inner or
sliding cylinder so as to maintain practically a uniform space between the two
cylinders, the said flange having elongated openings formed in it to admit the air.
A deflecting plate upon the outer cylinder tends to direct the air into these
openings.
In practice the lower part of the inner cylinder is made of larger diameter than
the other part thereof to form a ledge upon which one end of a spring bears the
cther end of the spring bearing against the flange at the upper end of the outer
cylinder, the said spring serving for normally pressing down the inner cylinder to
embrace the top of the globe or glass.
It will be understood that with this arrangement the air which is delivered into
the usual side air tubes enters between the two cylinders at the head of the lamp
whilst the products of combustion escape through the inner cylinder.
In order to promote the circulation of the air, holes or ports are formed in the
inner cylinder so that the upward current of heated air through the interior of
the latter will tend to draw in air between the two cylinders. These ports or
holes are formed at points at right angles to the openings of the air tubes.

page_text: he upper end of the inner or sliding cylinder a. Another flange his arranged on
the outer cylinder at its lower end in order to guide the lower end of the inner or
liding cylinder so as to maintain practically a uniform space between the two
cylinders, the said flange having elongated openings i, i Figure 4, formed in it to
admit the air. A deflecting plate jupen the cater cylinder tends to direct the air
into these openings.
In practice the lower part of the inner cylinder b is made of larger diameter than
the other part thereof to form a ledge upon which one end of a spring / bears
the other end of the spring bearing against the flange g at the upper end of the
outer cylinder, the said spring serving for normally pressing down the inner
cylinder to embrace the top of the globe or glass.
To avoid the contraction of the air space between the two cylinders owing to the
enlargement of the lower part of the cylinder b the outer cylinder a is also enlarged
in a manner which will be clearly understood by reference to Figures 1 and 2,
openings or louvres m, m being formed in this enlarged part of the cylinder a to
ensure a full supply of practically pure air entering the air space c from which it
is conveyed through the tubes d, d to the burner a screen or baffle n being placed
opposite to these openings to prevent draughts.
It will be understood that with this arrangement the air which is delivered into
the usual side air tubes d, d enters the space c between the two cylinders at the
head of the lamp whilst the products of combustion escape through the inner
cylinder without coming into contact with the air supply for the burner.
In order to promote the circulation of the air, holes or ports o, o are formed in
the inner cylinder so that the upward current of heated air through the interior of
the latter will tend to draw in air between the two cylinders. These ports or
holes are formed at points at right angles to the openings of the air tubes d, d.
To prevent the said inner cylinder from turning so that the said holes or
ports o, o come opposite to the openings of the air tubes d, d a wire is passed
through the two concentric cylinders a, b, the ends of the wire being fixed in the
outer cylinder whilst the inner cylinder is slotted at q, q to allow of its sliding
relatively with the wire the said wire also serves for preventing the inner
cylinder from being pushed too far down under the action of the spring 1.
In order to prevent the air from eddying in the air space c the latter has
arranged within it partitions r, r which are fixed to the inner wall of the outer
cylinder a as shewn in Figures 2, 3 and 4.
Air holes s, s are formed around the bottom of the inner or sliding cylinder to
admit fresh air into the chimney for preventing smoking.
The gallery or plate t upon which the globe is carried is perforated in such a
manner that more air comes into contact with the flame at the ends than at the
sides a suitable arrangement of perforations being shewn in Figure 5. In order that
the said gallery or plate shall not be moved into an improper position relatively
with the burner I hinge it as shewn at u in Figure 1 or otherwise arrange it to
ensure that it shall always occupy the same position.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what
claim is:-
1. A hurricane or tubular lantern wherein the tubes which conduct air from
the head of the lantern to the burner communicate with a space formed between
two cylinders and into which fresh air is admitted, substantially as described.
2. In a hurricane or tubular lantern having an air space formed at the head of
the same between two concentric cylinders, adapting the inner cylinder to slide
longitudinally and to engage with the upper end of the globe or chimney of the
lantern, substantially as described.
3. A hurricane or tubular lantern having a plate or gallery carrying the globe or
5 chimney arranged substantially in the manner described so as to admit larger
quantities of air at the ends of the flame than at the sides.