IMPROVE- MENTS IN STREET AND OTHER LAMPS
Year: 1884

page_text: I WILLIAM CROMPTON WADDINGTON of the Town Hall Manchester in the
County of Lancaster, Superintendent of the Gas Street Mains and Lighting
Department, do hereby declare the nature of the said invention for "IMPROVE-
MENTS IN STREET AND OTHER LAMPS to be as follows:-
My said Invention relates principally to street lamps and refers more particularly
to the ventilation of the upper part or lantern of such lamps. According to my
invention I dispense with the usual gauze trap or screen at the foot of the lantern
and admit air to the body of the lantern by means of internal conduits or channels
which in the case of polygonal or square lamps may be situated at the angles or
corner joints or may be otherwise conveniently situated. The said conduits extend
preferably above the level of the light and are composed of wire gauze or finely.
perforated sheet metal the upper end of each conduit opening into the lantern
whilst the lower end is in communication with the atmosphere. The air entering
at the lower end of the conduits partly permeates through the wire gauze sides
and is partly delivered through the upper ends thereof. To prevent the air in
windy weather from rushing too violently through the wire gauze sides of the
conduits and so endangering the light I prefer to make the wire gauze sides
double for a certain distance upward from the lower ends a space or chamber being
left between the inner and the outer wire gauze. The wind pressure is thus
broken up and reduced before being admitted to the lantern. To effect the same
object I might in some instances increase the fineness or density of the wire gauze
sides towards the lower part of the conduit Instead of making the conduits of
wire gauze I might employ finely perforated tubes of metal or other suitable
material.
The removal of the wire gauze trap from the foot of the lantern allows
uninterrupted passage of light through the glass bottom the lighting of the lamps
being effected through a hinged door at the side.
My invention is applicable not only to street lamps but also to other lamps of
a similar character.

page_text: Improvements in Street and other Lamps.
I WILLIAM CROMPTON WADDINGTON of the Town Hall, Manchester in the
County of Lancaster, Superintendent of the Gas Street Mains and Lighting
Department, do hereby declare the nature of the said Invention for "IMPROVE-
MENTS IN STREET AND OTHER LAMPS," and in what manner the same is to be
performed to be particularly described and ascertained in and by the following
statement and accompanying drawings :-
=
My said Invention relates principally to street lamps and refers more par-
ticularly to the ventilation of the upper part or lantern of such lamps. According
to my Invention I dispense with the usual gauze trap or screen at the foot of the
lantern and admit air to the body of the lantern by means of internal conduits or
channels which in the case of polygonal or square lamps may be situated at the
angles or corner joints or may be otherwise conveniently situated. The said
conduits are composed of wire gauze or finely perforated sheet metal the upper end
of each conduit opening into the lantern whilst the lower end is in communication
with the atmosphere.
In the accompanying drawings Fig. 1 represents a vertical section of one form
of my improved lamp and Fig. 2 a horizontal section on the line A. B. in Fig. 1.
In the said Figs. a. a. are the said conduits made of wire gauze or of perforated
metal. In the example the lamp is hexagonal in form and is provided with six
of the air conduits each conduit being secured to one of the slanting members b. b.
of the lantern frame. The upper end of each conduit opens into the enclosed
space within the lamp and the air has free access through an aperture or through
perforations in the bottom of the lantern frame into the lower end of each conduit.
The air entering at the lower ends of the conduits partly permeates through the
wire gauze sides and is partly delivered through the upper ends of the conduits.
To prevent the air in windy weather from rushing too violently through the wire
gauze sides of the conduits and so endangering the light I prefer to make the
wire gauze sides double for a certain distance upward from the lower ends a space
or chamber being left between the inner and the outer wire gauze. The wind
pressure is thus broken up and reduced before being admitted to the lantern.
Such a construction is indicated by Fig. 3. To effect the same object I might in
some instances increase the fineness or density of the wire gauze sides towards the
lower part of the conduit. The bottom of the lamp is closed by means of a plate
of glass c. which is free from any obstruction to the passage of the light. The
absence of the ordinary wire gauze trap from the foot of the lantern allows an
uninterrupted passage of light through the glass bottom the lighting of the lamps
being effected through a hinged door at the side as indicated by the dotted lines
at d. My Invention is applicable not only to street lamps but also to other lamps
of a similar character,

page_text: Having now particularly described and, ascertained the nature of my said
Invention and in what manner the same is to be performed I declare that what
I claim is
1. The combination of parts forming the lamp constructed substantially as
set forth and indicated herein before and in and by the accompanying drawings.
2. In a gas lamp the air conduits formed and applied substantially as and for
the purpose set forth and indicated.