Improvements in and connected with Portable Lanterns.
Year: 1890

page_text: Date of Application. 10th July, 1890-Accepted. 30th Aug.. 1890
COMPLETE SPECIFICATION.
Improvements in and connected with Portable Lanterns.
I, WILLIAM HENDERSON of 1, Parliament Square, Edinburgh, North Britain, 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:-
My invention relates to portable lanterns, particularly dark lanterns such as are
carried at the waist-belt by policemen and others, and it has for its object first to
provide means whereby the heat of the flame may he utilised for heating liquid food
without interfering with the primary use of the lantern and secondly to improve the
construction of the lantern in certain details hereinafter referred to with a view to
obviate some of the disadvantages incidental to such lanterns as now constructed.
Reference is to be had to the accompanying drawings, forming part of this
specification: wherein
COMPLETE SPECIFICATION.
Improvements in and connected with Portable Lanterns.
I, WILLIAM HENDERSON of 1, Parliament Square, Edinburgh, North Britain, 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:
My invention relates to portable lanterns, particularly dark lanterns such as are
carried at the waist-belt by policemen and others, and it has for its object first to
provide means whereby the heat of the flame may be utilised for heating liquid food
without interfering with the primary use of the lantern and secondly to improve the
construction of the lantern in certain details hereinafter referred to with a view to
obviate some of the disadvantages incidental to such lanterns as now constructed.
Reference is to be had to the accompanying drawings, forming part of this
specification; wherein
Figure 1 is a front elevation,
Figure 2 a rear elevation,
Figure 3 a side elevation,
Figure 4 a vertical section, and
Figure 5 a horizontal section, of the dark lantern.
Figure 6 is an underside view of the oil reservoir.
Figure 7 is a front elevation, (with the casing removed).
Figure 8 a rear elevation,
Figure 9 a side elevation, and
Figure 10 a central vertical section, of the liquid heater separately.
Figure 11 is a front elevation of the lamp and heater as combined for use.
The same letters of reference indicate the same parts in all the figures.
Referring, first, to figures 7 to 11, I provide for superposition upon the lantern
body, as shewn in figure 11, a liquid heater A being a vessel preferably of
approximately semi-cylindrical form corresponding to that of the body of the
lantern and adapted to be hung upon the waistbelt when not in use by a tongue or
hook a at back. This vessel is provided at bottom with a downward extension B of
the body portion A adapted to fit in the chimney orifice N of the lantern body and
support the heater in position thereon when in use, said extension of the heater being
traversed by a vertical flue C leading into a horizontal flue D traversing the body A
and opening out at the sides thereof, as shewn. The heater is enclosed in an external
casing E E' whereof the semi-circular or front portion E is removable, being fitted
to slide in vertical guides e e on the back portion which is permanently attached to
the heater, the said casing, and particularly the sliding front portion E thereof, being
at such a distance from the walls of the heater A as to enclose a flue space el into
which the heated gases from the flame are conducted by the internal flues CD above
mentioned. The whole of the front of the heater is thus rendered available for
heating surface in addition to the internal flues and loss of heat by radiation is
prevented. In order to securely retain the sliding part of the casing E in position,
and maintain the proper distance between it and the heater, it is caused to make a
tight fit in its grooves by means of tubular tapered distance pieces e³ soldered to the
body of the heater over which the sliding casing E is tightly forced. This sliding
casing E descends slightly below the level of the bottom of the body of the heater Å
and is provided at the upper part with a row of orifices e for the final escape of the
products of combustion. F is the filling mouth of the heater, closed by a plug.
Referring now to figures 1 to 6, illustrating the construction of the lamp, the body
portion G G is preferably of semi-cylindrical form, the back G₁ being flat or slightly
concave so as to fit snugly against the waist belt upon which it is hung by a metal

page_text: spring tongue or hook g and boss g¹. The lens is mounted on the curved front G of
the body which is made with double walls to receive a darkening slide I fitted to
run in the space between the double walls and to pass behind the lens aperture in
order to eclipse the light, said slide being operated by a handie running in a slot
in the outer wall and the slide being wholly removable, for cleaning, for which
purpose the space between it and the slot are open at the rear end, the slide being,
however, prevented by the back G' from being accidentally drawn out when the
lantern is closed. The back G₁ is hinged at one side h to the body G and is secured
at the other by a wire bolt K formed of two parallel members sliding the one in a
guide on the door G¹ and the other in staples kk on the parts G G respectively.
Wire handles L. are hinged to the back G¹ by which to carry the lantern in the hand,
said handles being turned sideways and lying flat against the back, as shewn in
figures 1, 2, 5, 11, when the lantern is carried at the belt and one of them being
adapted to come above the outwardly bent handle k of the locking bolt K of the
door, as shewn in figure 2; and so prevent it becoming accidentally unlocked. The
body G is provided with a chimney cap M formed of an inner cap m with orifices at
its upper end enclosed at a distance by an outer cap m¹ open at bottom so as to permit
the free escape of the products of combustion but not the emission of light. This
cap M is removably applied to the flange around the outlet aperture N in the top of
the body and secured in position by a sliding bolt O formed of two parallel members
sliding in staples o¹³ on the cap and body respectively and having an outwardly bent
end o which is also prevented by one of the handles L from becoming accidentally
unfastened. When however the handle is turned to the position shewn in figures 3
and 4 both the bolts K and O may be unfastened.
The lamp proper is specially constructed to prevent spilling of oil which may over-
flow at the burner and for this purpose the semicircular front of the oil reservoir P is
provided with an outer encircling casing p open at top and forming a deep gutter
adapted to intercept and receive any oil that may overflow at the burner, and prevent
it running down into the lantern casing and thence on to the clothes of the person
carrying the lantern. The oil reservoir P is supported upon a stand q attached to
the bottom of the reservoir and so constructed as to afford the necessary provision
for the admission of air to supply the flame and adapted to fit in guides q¹ on the
bottom of the lantern casing by which the correct position of the lamp within the
lantern is ensured: The back or door G¹ of the lantern casing is made with double
walls provided with orifices at the lower part of the outer wall and with orifices³
at the upper part of the inner wall (which is also the reflector for the lamp flame)
whereby a circulation of cold air is maintained through the intervening, space so as to
prevent transmission of heat through the back G₁ and admit an ample supply of
air to the interior of the lantern casing to prevent overheating. An adjustable
ventilator S is also provided near the top of the front part of the lantern body for
preventing overheating when the lamp is used indoors.
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. The combination, with a lantern, of a heater for liquids, consisting of a vessel,
substantially of the form described, adapted to be fitted to the chimney aperture of
the lantern in place of the chimney cap so as to receive heat from the flame whilst
the lantern is carried at the belt, as specified.
2. A heater for liquids having a downward extension of the body portion and
adapted to be fitted to the chimney orifice of a lantern, as described, and provided
with internal flues leading up through such downward extension and opening out
at the sides of the body portion into a peripheral flue enclosed between the heater
and an outer casing, as described.
3. A heater for the purpose specified of semi-cylindrical form having internal flues
and surrounded by an outer casing enclosing a flue space and whereof the curved
front portion is removable by sliding in guides, as specified.

page_text: 4. The combination of the hinged handle and of the sliding bolts for securing the
door and chimney cap and provided with outwardly bent heads whereby the bolts are
prevented by the handle from becoming accidentally unfastened, as specified.
5. The back or door of the lantern, constructed with double walls and an intervening
air space with inlets and outlets, as described.
6. The combination, with the oil reservoir, of a peripheral catch-gutter for any oil
that may overflow, as specified.
7. The oil reservoir provided with a supporting stand constructed as described
adapted to slide in guides on the bottom of the lantern casing, as described.
Dated this 10th day of July 1890
WILLIAM HENDERSON.
By A. M. & Wm. Clark,
53, Chancery Lane, London, Patent Agents.
WILLIAM HENDERSON.
By A. M. & Wm. Clark,
53, Chancery Lane, London, Patent Agents.