Year: 1887

page_text: NGJE
Date of Application, 28th Sept., 1887
Complete Specification Left, 28th June, 1888
Complete Specification Accepted, 3rd Aug., 1888
I, FRANK WILLIAM CLARK, of Upper Ogle Street, in the County of Middlesex,
Engineer, do hereby declare the nature of this Invention to be as follows:-
This Invention relates to gas lamps with a downwardly burning flame enclosed in a
globe to which heated air for combustion passes from above such as the lamp known
as the "Wenham lamp," and the said Invention has for its object to ensure the steady
burning of the lamp in places subject to sudden gusts or currents of air so as to render
the lamp steady for external lighting.
According to this Invention the chimney is surrounded by a casing communicating
at bottom with the hood by which the air enters to supply the flame and at top with a
chamber into which the top of the chimney opens. This chamber has openings for the
escape of the surplus air and the products of combustion. Between the inlet orifices
for the external air to the aforesaid hood and the openings to the heating passages by
which the air passes to the flame is situated a deflector or guard so shaped that it
directs the air upwards towards the space surrounding the chimney and before the
said air or a portion of it passes into the said heating passages. Thus any excessive
amount of air due to sudden gusts of wind or currents of air will not pass into the
heating tubes and to the flame so as to cause unsteadiness but only the proper
regulated quantity will pass steadily to the flame the surplus passing into the space
surrounding the chimney (modifying the draught on the chimney) and out with the
products of combustion by the perforations in the top chamber and assisting the
proper regular flow of air to the flame by the draught on the chimney. The aforesaid
deflector or guard may-have perforations a little below its top so that currents of air
passing through them will meet the air passing above the deflector or guard and assist
in modifying or tempering unsteady motion in the air before it passes to the heating
passages.
n
11
301
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, London, W.C.,
Agents for the said Frank William Clark.

page_text: I FRANK WILLIAM CLARK of Upper Ogle Street in the County of Middlesex
Engineer 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 gas lamps with a downwardly burning flame enclosed in
a globe to which heated air for combustion.passes from above such as the lamp known
as the "Wenham lamp" and the said Invention has for its object to ensure the steady
burning of the lamp in places subject to sudden gusts or currents of air so as to
prevent fluctuation or unsteadiness of the flame of the lamp when in use for external
lighting or in places exposed to sudden gusts or strong air currents.
According to this Invention the chimney is surrounded by a casing communicating
at bottom with the hood or lower chamber by which the air enters to supply the flame,
and at top with a chamber into which the open top of the chimney enters. This
chamber has openings for the escape of the surplus air and products of combustion.
Opposite the inlet orifices for the external air, deflectors or guards are situated, they
being so shaped and situated as to direct the air upwards towards the space
surrounding the chimney. Thus any excessive amount of air due to sudden currents
or gusts of wind will not enter directly into the tubes of the heater and on to the
flame so as to cause unsteadiness thereof but only the proper regulated quantity will
flow steadily to the flame the surplus passing upwards into the space surrounding the
chimney moderating and checking any excess of draught therein and finally escaping
with the products of combustion through the perforations in the top chamber thus
assisting the proper regular flow of air to the flame caused by the draught in the
chimney.
And in order that my said invention may be fully understood I shall now proceed
more particularly to describe the same and for that purpose shall refer to the several
figures on the annexed sheet of drawings the same letters of reference indicating
corresponding parts in all the figures.
Figure 1 represents in vertical section a lamp constructed or arranged according to
my invention and Figure 2 is an elevation of the same with the upper part in section
to show a modification.
a is the globe in which burns the flame and a' is the burner and a³ the passages by
which the air for supply to the flame is heated by the escaping products of combustion
passing up into the chimney b. c is the gas supply pipe. These parts aro or may be,
like those in what is known as the Wenham lamp. The chimney b is surrounded by
a casing d of a diameter to leave an air space between its inner side and the
exterior of the chimney. The said casing a communicates at its lower end with the
lower hood e into which air enters by the perforations to supply the flame by
passing through the channels as of the heater. The upper end of the casing d opens
into the chamber finto which the upper end of the chimney also opens as illustrated.

page_text: This chamber has perforations in it at and at f³ the upper ones f being covered
by a hood g which may be formed in one with the top cover or cap of the lamp.
Perforations are also made at d³ in the lower part of the casing d. The perforations d³
and have opposite them inside the casing d and hood e respectively deflectors or
guards ii which direct the air entering the said perforations upwards towards the.
space d so that any excessive amount of air due to sudden currents or gusts of wind
will not enter directly into the tubes 3 of the heater and impinge onto the flame as
the surplus beyond that required for the flame passes upwards into the space and
finally escapes with the products of combustion through the perforations thus
controlling and ensuring the proper regular flow of air to the flame caused by the
draught in the chimney.
In some cases more particularly in lamps of large size I may use in place of or in
addition to the perforations 2 (as shown in Figure 2) a perforation in the cap
from which perforation depends a shield ³ (preferably conical). j is a weather guard
above the opening h³.
The openings at f³ serve to allow air to flow in and out with the varying conditions
of the currents in the upper part of the lamp so as to assist in maintaining the
necessary conditions of steady air supply to the flame. The guard i opposite the
perforations may be perforated as this will be found to be a ready means of
regulating the air supplied to the flame.
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. In gas lamps the combination with the burner enclosed in a globe or the like and
provided with means for heating the air supply to the flame of the air space d² in
communication with the space into which the air to be beated enters and a chamber
above into which the chimney opens and from which surplus air and products of
combustion escape substantially as hereinbefore described.
2. In gas lamps of the kind referred to the combination of the air receiving hood or
chamber e air space d² and chamber with openings therein for the entry of air and
escape of surplus air and products of combustion substantially as hereinbefore described
and illustrated in the accompanying drawings.
3. In gas lamps of the kind referred to the combination of the air space d² forming
a passage from the air inlet e to the chamber fabove the chimney and of a guard or
deflector to deflect the air entering at the inlet e substantially as hereinbefore
described and illustrated in the accompanying drawings.
4. The arrangement and combination of parts constituting the gas lamp hereinbefore
described and illustrated whether the outlet chamber be arranged as described with
reference to Figure 1 or with reference to Figure 2 of the accompanying drawings.
Dated this 28th day of June 1888.