Improvements in Street and other Lamps.
Year: 1890

page_text: Date of Application, 13th Oct., 1890
Complete Specification Left, 11th July, 1891-Accepted, 22nd Aug., 1891
PROVISIONAL SPECIFICATION.
Improvements in Street and other Lamps.
I WILLIAM CROMPTON WADDINGTON of the Town Hall Manchester in the
County of Lancaster, Superintendent of the Gas Mains and Lighting Department
do hereby declare the nature of this invention to be as follows:-
My invention relates principally to the lamps which are used in the lighting of
streets and thoroughfares. In a former invention for which Letters Patent
Number 15438 of the year 1884 were granted to me I admitted air to support
combustion through finely perforated conduits in order to control the admission of
air so as to ensure the obtainment of a steady light. In my present invention I
adinit the air through inlets which are each provided with a valve or with valves
which tends or which tend to close at times when there would be too strong an
inrush of air as for example at times when there would be gusts of wind. In the
simple construction which I consider to be suitable the air passes upward, through
perforations into a small cylindrical shell within which is a thin annular disc. The
air issues into the body of the lamp through perforations which are formed near the
circumference of the shell so as to leave the central portion free from perforations
or by preference the perforations are formed in the cylindrical wall of an annular
upward extension of the chamber. The inflowing air passes through the central
opening of the disc valve and thence through the said perforations into the body of
the lamp. A strong inrush of air tends to lift the said disc valve and as the said
valve when raised stops or checks the outflow from the chamber the access of
strong draughts of air into the body of the lamp is prevented and the steady
burning of the flame or flames furnishing the light is promoted. I prefer to make
the air inlet appliances of thin tinned sheet copper one two or more being applied
to the lamp according to its size and to the proportions of the said appliances.
Dated this 11th day of October 1890.
DUTTON & FULTON,
1, St. James Square, Manchester, Agents.
COMPLETE SPECIFICATION.
Improvements in Street and other Lamps.
I WILLIAM CROMPTON WADDINGTON of the Town Hall, Manchester, in the
County of Lancaster, Superintendent of the Gas Mains, and Lighting Department,
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 and accompanying drawings:-
―
My invention relates principally to the lamps which are used in the lighting of
streets and thoroughfares. In a former invention for which Letters Patent
No. 15438 of the year 1884 were granted to me I admitted air to support
combustion through finely perforated conduits in order to control the admission of
air so as to ensure the obtainment of a steady light. In my present invention I
admit the air through inlets which are each provided with a valve or with valves
which tends or which tend to close at times when there would be too strong an
inrush of air as for example at times when there would be gusts of wind. In the
simple construction which I consider to be suitable the air passes upward through

page_text: '
perforations into a small cylindrical shell within which is a thin annular disc. The
air issues into the body of the lamp through perforations which are formed near the
circumference of the shell so as to leave the central portion free from perforations
or by preference the perforations are formed in the cylindrical wall of an annular
upward extension of the chamber. The inflowing air passes through the central
opening of the disc valve and thence through the said perforations into the body of
the lamp. A strong inrush of air tends to lift the said disc valve and as the said
valve when raised stops or checks the outflow from the chamber the access of strong
draughts of air into the body of the lamp is prevented and the steady burning of the
flame or flames furnishing the light is promoted.
tgl
By referring to the accompanying drawings a clear understanding of the nature
of my invention will be obtained.
In the said drawings
Fig. 1 is a vertical sectional view of the lower part of a lamp and
Fig. 2 is a plan view of the lamp bottom.
Fig. 3 is a sectional view of one of my improved air inlets.
In Figs. 1 and 2 a a are six air inlets each of the formation illustrated by Fig. 3.
In the example the inlet appliance is made in three parts a band c.
The part c
is an annular dished piece which is formed with an air passage which is only
slightly less in diameter than the cylindrical part so that there is left a narrow
annular edge c upon which the valve sits. The part which fits tightly upon
the ring c is in the form of a cylinder open at one end and having its closed end
deeply dished inward so that an annular air passage is formed. The outer
cylindrical wall a and the dished part a are both perforated so that air can escape
freely from the said annular passage as indicated by the arrows. Between the flat
bottom of the dish a' and the top edge of the ring there is a little space for the
play of the valve b. This valve consists of a disc of thin sheet metal in which is
formed a central opening which is considerably less than the opening in c and is a
little less than the flat bottom of a'. For convenience of manufacture and for sake
of durability I have formed all the parts of thin sheet copper by stamping and
punching but any other suitable material may be used. It is however important
that the valve & shall be very light so that a strong gust of wind will lift it from its
seat and I therefore prefer to make this part of thin sheet copper or nickel or 'of
tale or of a metal or material which will not oxidise or deteriorate to such an extent
as to interfere with the action of the valve. It will be seen that owing to the
comparatively large area which the valve exposes to the upward flowing current of
air the valve will be lifted from its seat by a strong air current and that when so
lifted the opening in the valve will be closed or restricted by the bottom of the
dish a' so that strong gusts of wind are prevented from passing into the interior of
the lamp. I do not confine inyself to the exact forination of the air inlet so long as
the lifting valve or a similar valve is used nor do I confine myself to the form of
the lamp nor to the number of air inlets applied to lamp.
'
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 I
claim is':
,י
1. The apparatus for admitting air to the interior of a lamp substantially as set
forth and indicated.
2. The disc valve the seating c and the cover or upper shell a al substantially
as and for the purpose set forth and indicated.
3. For admitting air into the enclosed space of a street or other lamp to support
combustion a light perforated disc valve resting upon a seating having a larger air
way than the valve in combination with a covering plate or part adapted to close or
restrict the air passage through the valve when the latter is lifted from its seat
substantially as set forth and indicated.
4. Admitting air into the enclosed space of a street or other lamp through an

page_text: apparatus containing a light valve freely resting upon a seating or support and an
air passage or air passages which is or are closed or restricted when the valve is
lifted from its support by an upward rush of air substantially as set forth.
Dated this 10th day of July 1891.
DUTTON & FULTON,
1, St. James' Square, Manchester, Agents.