Improvements in or connected with Gas or Oil Lamp Globes or Chimneys.
Year: 1891

page_text: Date of Application, 14th May, 1891-Accepted, 4th July, 1891
COME JE MINIATION.
Improvements in or connected with Gas or Oil Lamp Globes or
Chimneys.
I ALEXANDER OGILVIE BROWN of 27 Holyrood Quadrant, Glasgow in the
County of Lanark, North Britain Gas 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 which relates to improvements in gas or oil lighting is more
especially applicable to the lighting of domestic rooms, offices and analogous
places where wall brackets, gasaliers and similar pendants are used with glass
globes.
It is well known, that to obtain the best illuminating results depends upon
certain physical and chemical conditions of the atmosphere contained within the
glass globe. Rarefied or highly heated air produces more complete combustion
than cold air, and by limiting the space for the outlet of the waste gases at the top
of the globe, forming thereby an area of intensly hot air around the flame, entire
combustion of the hydro-carbon is effected while the carbon decomposed becomes
highly incandesced with increased steadiness of the flame.
Various means, attended with various results more or less approaching success,
have been adopted to attain these ends.
It has been found, among the many discoveries which have been made, that no
one particular form of contracting top or cover has been produced which will
accomodate itself to the many variety of shapes and sizes of globes.
In accordance with my invention, I have as the result of various experiments,
discovered a means of overcoming this difficulty by a device, which for readability
of adjustment (as will be hereafter more fully described) to globes of different
areas and with equal results from varying pressures of gas supply; and which for
simplicity, portability, and economy of action will at once recommend itself to gas
consumers.
In carrying my invention into practice I take two three or more strips of copper,
brass or hard metal, preferably steel, in the ends of which I punch holes and
connect them together at the aforesaid ends by an eyelet; the other ends I
terminate with clips, which may be made out of the strips themselves or of
separate pieces secured thereto by rivets or studs. These metal strips, the
clips thereof securing the periphery of the globe at the top, constitute a tripod or
bridge.
Passing freely through the cyclet I insert a threaded spindle by which I suspend
by means of a milled nut above the said eyelet and another one near the end of the
spindle, a shallow inverted cup of opal glass or its equivalent, which performs a
twofold function of damper and reflector.
As an alternative of this arrangement I sometimes employ a short conical cover
or top made either of glass or of any other analogous material.
This cover or top I support by clips secured within the ring of a coronet which
is placed upon the top of the globe as is well understood. The conical cover or
top terminates at its apex in an opening of suitable diminishing area, to allow the
waste gases to pass off, ornamented by a lip bulging outwards. In lieu of this I
make the cover or top in the shape of an inverted cup or bowl similarly provided
with an opening as last described. The supports in both these arrangements may
be the same or I may employ pieces, say three or four pieces, of non conducting
material placing them within the ring of the coronet. These pieces of non con-
ducting material provide a suitable seat for the cover or top and by these means
heat imparted to the damper or reflector is not transmitted to the coronet and rice
cersa.

page_text: In order that my invention may be properly understood I have hereunto
appended a sheet of explanatory drawings whereupon
Figure 1 represents in sectional elevation a portion of an ordinary gas globe
shewing my improvements applied thereto.
Figure 2 is a plan of Figure 1 and
Figure 3 represents in section the tripod or bridge in its collapsed form as
hereinafter more fully described.
Figures 4 and 5 being similar views to Figure 1 represent two modifications of
my improvements.
A indicates a gas globe, B a damper or reflector suspended by means of bent
arms C, through the median of a threaded spindle D. The bent arms C, constitute a
tripodior bridge by virtue of the clips c, provided at their extreme ends. Figs. 1. 2. & 3.
shew the construction of one form of clips and Fig. 1 shews how they hold on the
upper edge of the globe A. A short tubular piece d', upon which is cut a screw
thread, passes through the arms C, at their upper ends as aforesaid, and by means
of a jam nut d, the said ends are connected together centrally with the gas globe A.
as shewn in Fig. 1.
The screwed spindle D, with the reflector or damper B, is capable of being
moved up or down by means of the milled nut d. It will be obvious from Fig. 1,
that the position of the reflector or damper B, may be adjusted from time to time,
thereby contracting or widening the outlet of the globe to suit different degrees of
brilliancy of light. A very simple arrangement by which the arms C, are or may
be connected together is shewn at Figure 3. An eyelet d³, such as is commonly
used in the manufacture of boots and shoes is employed to connect the arms C.
Upon the eyelet 3, the arms C, may be freely turned and readily collapsed
as shewn in Fig. 3. when my improvements are required to be packed for transit
or otherwise.
'
Fig. 4 represents a device which, though not adjustable, gives, for ordinary
requirements very good results E, the frustum of a cone, formed of opal glass,
but may be formed of any other vitreous material capable of reflecting light, held
in position at its base by clips e, rivetted to the flanged ring of a coronet G. The
coronet G is the usual type employed in gas lighting. The apex of the said conc E
is provided with an outlet e, for the escape of the products of combustion as will be
well understood.
Figure 5 represents a similar device to Fig. 4; but in lieu of a cone I form the
top or cover into a shallow inverted cup or bowl F having the outlet g, for the
purposes as last described, and made of the same material. Instead of the before
mentioned clips c I may use in both modifications Figs. 4 & 5 small pieces f, of
non conducting and fire resisting material for supporting the base of both cone E,
and inverted cup or bowl F in their respective positions.
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.
First. For use in connection with gas or oil lamp globes or chimneys my
improved cover or top hereinbefore described and illustrated, whereby the atmo-
sphere around the flame is highly heated and the illuminating power increased
substantially as and for the purposes herein before described.
Second. For use in connection with gas or oil lamp globes or chimneys a
collapsible tripod or bridge or any other modification of the said parts all sub-
stantially as and for the purposes hereinbefore described and shewn in the
accompanying drawings.
Dated this 13th day of May 1891
ALEXANDER OGILVIE BROWN,
27, Holyrood Quadrant, Glasgow, Applicant.