Year: 1887

page_text: Date of Application, 10th Nov., 1887
Complete Specification Left, 9th Aug., 1888
Complete Specification Accepted, 14th Sept., 1888
1, THOMAS GARDINER MARSH of Lytham in the County of Lancaster Consulting
Engineer do hereby declare the nature of this Invention to be as follows
My said Invention has reference to regenerative gas lamps and refers partly to
improvements upon a former invention for which I have made application for Letters
Patent on the 22nd day of February 1887, No. 2708. In the said application I made
reference to a collar or ledge situated beneath the horizontal perforations in the
burner the said collar or ledge assisting to steady the flame and to increase its
luminosity. I have found that owing to the extreme heat generated in the burner the
perforations are apt to become choked and the said collar or ledge to become coated
with carbonaceous or sulphurous deposits from the gas, thus injuring the form of
the light. To obviate these defects and to keep the burner and ledge sufficiently
cool to prevent this injurious deposit, I prolong the lower part of the burner so as to
transmit part of the heat in the burner to a point removed from the perforations, thus
reducing the temperature at the perforations to a pitch which will not cause
deposition. I also insulate the said collar or ledge from direct contact with the foot of
the burner so as to protect it from overheating. By an arrangement which I at
present adopt I screw an extension to the foot of the burner and interpose a
washer or packing of asbestos, steatite or other heat-resisting and non-conducting
material or composition between the extension and the foot of the burner. The
extension is so fashioned as to present the aforesaid ledge or collar beneath the per-
forations but owing to the insulation afforded by the non-conducting material between
the extension and the burner and owing also to the heat absorbing prolongation
beneath, the burner and collar remain comparatively cool and the injurious deposit of
carbon is avoided. In a pendant lamp in which the gas supply comes from above
the extension may be prolonged downward toward the bottom of the glass shield and
may be made conical or cylindrical hollow or solid or may present a fluted or cor-
rugated surface or may be provided with radiating fins or with any surface or formation
best calculated to radiate the heat drawn from the proximity of the burner. In a

page_text: lamp supported from beneath upon a bracket or standard and deriving its supply of
gas from beneath I arrange the prolongation from the burner in the form of a
tube either with or without perforations. When the said tube is perforated a
supply of air enters from beneath and escaping in a heated condition through the per-
forations into the interior of the glass shield unites with the heated air coming from
the regenerative arrangement above and assists to feed the flame. For convenience
of lighting I carry the glass shield upon a sliding or telescopic gallery supported upon
a helical spring. When it is wished to light the lamp the shield is pushed down
against the pressure of the spring and a lighted taper introduced through the opening
at the top of the shield. When the lamp is lit the spring pushes the released
shield closely against the upper part of the lamp and maintains it in that position.
The upper regenerative portion of the lamp may be of any ordinary or suitable con-
struction. Parts of the foregoing improvements may be applied to lamps other than
of the construction referred to in my said foregoing application.
Dated this 9th day of November 1887.
DUTTON & FULTON,
1, St. James Square, Manchester,
Agents.

page_text: Improvements in Regenerative Gas Lamps.
I THOMAS GARDINER MARSH of Lytham in the County of Lancaster, Consulting
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 and accompanying drawings:-
My said Invention has reference to regenerative gas lamps and refers partly to
improvements upon a former invention for which I have made application for Letters
Patent on the 22nd day of February 1887 No. 2708. In the said application I made
reference to a collar or ledge situated beneath the horizontal perforations in the
burner the said collar or ledge assisting to steady the flame and to increase its
luminosity. My present invention relates to improvements intended to keep the said
collar cool and free from deposits and also to prevent the clogging of the perforations
in the burner. The invention also relates to an improved mode of supporting the
glass shield so as to facilitate the lighting of the lamp.
And in order that my said invention may be properly understood I will now
proceed more particularly to describe the same, reference being had to the annexed
sheet of drawings.
Fig. 1 is a sectional view of the burner of a pendant lamp and consisting of the
tube a having perforations at the foot as shown to permit of the issue of the gas.
Mounted on the tube a is the collar 6 which is described and claimed in my said fore-
going patent No. 2708 of 1887. In the present instance the collar is separate from
the burner and between the burner and the collar I interpose a thickness c of asbestos,
steatite or other non-conductor of heat. To the foot of the burner I screw or other-
wise attach a tail d which is also insulated from the collar 6 by non-conducting
material as shown. The heat which is generated in the burner a is transmitted to and
given off by the taild so that the burner is kept much cooler than if no such provision
were made, and in consequence the perforations are not so liable to become clogged
with sulphurous and carbonaceous deposits. The collar b being insulated from both
the burner a and the tail d is also kept cooler and less liable to become coated
with deposit than heretofore. Fig. 2 shows my improvement applied to a bracket
lamp or lamp receiving its supply of gas from beneath instead of from above as in
Fig. 1. The collar bis applied and insulated in a similar manner. Instead of the
tail d I here apply a hollow sleeve e which surrounds the gas supply pipe a¹ and
projects through the foot of the glass shield fa portion of which is shown. Air enters
the sleeve e at the foot and escapes through the perforations into the interior of the
glass shield thus keeping cool both the sleeve and the gas supply pipe and assisting to
feed the flame. The tail shown at Fig. 1 may be made hollow instead of solid and
the said tail or its hollow equivalent in Fig. 2 might be formed with gills or fins to
radiate the heat more readily. Fig. 3 shows an improved mode of supporting the
glass shield of bracket or standard lamps or of lamps having an attachment projecting
through the foot of the shield or having such other attachment as will permit of the

page_text: application of my improvement. I provide a helical spring . contained in a sleeve h
at the foot of the lamp the lower end of the spring resting on a collar or projection
from the supply pipe a while the upper end exerts pressure against the foot of the
glass shield. When it is desired to light the lamp I lay hold of the sleeve and
pull down the glass shield against the resistance of the spring. The shield is
thus pulled away from the upper part of the lamp and a lighted taper is introduced
through the opening at the top of the shield. The lamp having been lit the shield
is released and is closed by the spring which pushes the shield against the upper part
of the lamp and maintains it in position. If preferred the spring may be applied in
the interior of the shield and held in tension instead of in compression.
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 1
claim is :-
(1) In regenerative gas lamps of the indicated nature providing the burner with
an extension or tail either solid or hollow to carry off heat and to assist in keeping the
burner cool and insulating the collar from the burner and from the tail for the
purposes and substantially as herein before described and shown in Figs. 1 and 2 of
the drawings.
(2) In regenerative gas lamps supporting the glass shield in position by means of
a spring so as to facilitate the lighting of the lamp substantially as hereinbefore
described and shown.
Dat this uch
L
1000