Improvements in or connected with Incandescent Gas Lamps.
Year: 1897

page_text: Date of Application, 20th Aug., 1897-Accepted, 25th Sept.,
1897
COMPLETE SPECIFICATION.
Improvements in or connected with Incandescent Gas Lamps..
I, ERNEST MILTONBERGER WHITE, of 710 North 34th Street in the City and
County of Philadelphia, State of Pennsylvania, one of the United States of America,
Mechanical 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:-
The main object of my invention is to provide a chimney for incandescent gas
lamps such that a strong current of air will be maintained, thus increasing the
illuminating power of the lamp.
A further object of my invention is to make the chimney in two parts so as to
prevent the breaking, or smutting of the globe owing to any defect there may be in
the incandescent mantle.
:
By my invention I can utilize a mantle until it drops from the holder, as the
perforations, or tears, in the mantle will not affect the light and will not destroy the
chimney. Prior to my invention the great difficulty, in what has been known as
the "Welsbach light, has been that the glass chimneys, and the mantles, used,
were broken as soon as the inantle was perforated as the gas within the mantle
would escape through this perforation and the jet of. flame would strike the chimney
and immediately crack it and portions of the cracked chimney would, in many
instances, fall onto the mantle and destroy it so that the mantle and chimney would
have to be renewed. By my invention this difficulty is overcome and the mantle
can be used until it is in shreds.
1
In the accompanying drawings Figure 1 is a vertical section of so much of
a lamp as is necessary to illustrate the application of my invention thereto.
Figures 2, 3 and 4 are sections of the upper parts of lamps illustrating modifications
of my invention. Figure 5 is a vertical section illustrating a further modification
of my invention; and Figure 6 is a vertical section illustrating an arrangement
according to my invention wherein the lower portion of the chimney is contracted
at its upper end.
A is a burner of the ordinary "Welsbach "incandescent lamp, consisting of a crown a,
air and gas mixing tubes a¹, air valve 2 and the chimney holder B. Secured to a
bracket on the chimney holder is the rod c suspended from which is the mantle C.
The chimney is made in two sections D D and above the chimney is a stack D².
Surrounding the upper portion of the chimney is a funnel shaped hood D³ which may
be secured to the stack 12 and rest upon the gallery b¹ supported by the usual rods b²
of the Welsbach burner.
E is the globe which rests upon the supports 63 of the holder B and extends to the
hood D3.
The space between the upper portion D' of the chimney and the hood D³
communicates with the stack or flue D2 and, as the space within the lower portion of
the chimney D is open to the atmosphere at the bottoin, and the space between
the chimney and the globe is also open to the atmosphere at the bottom, and both the
upper part of the chimney and the portion between the chimney and the hood are
open to the stack, two currents of air are formed, one within the chimney and in

page_text: contact with the mantle and the other between the chimney and the globe. I prefer
to make the upper portion D¹ of the chimney conical and I may mount in the stack
an inverted cone d, which will divert the currents as they pass up through the
stack.
I prefer to extend the lower portion of the chimney D above the lower portion of
the mantle, and the upper portion of the chimney below the upper portion of the
mantle, as I find that I can, by this construction, materially increase the illuminating
power of the incandescent inantle.
It will be seen that by thus making the chimney in two parts 1 prevent the
breaking of the chimney by the jets of flame which issue through perforations of
abnormal size in the mantle, as these jets are turned upwards by the outside current
so that they will not come into contact with the globe, thus I ain enabled by this
construction not only to greatly increase the illuminating power of the lamp, but also
prolong the life of the mantle and effect considerable economy as I have used
mantles in lainps provided with my Invention until they were in shreds.
The shade F is shewn as resting upon the shade holders d' on the hood D³ but the
shade may be mounted on the lamp in any suitable manner, or may be dispensed
with as in the arrangement Figure 5.
In Figure I have shewn the upper portion of the chimney and the stack made in
one piece and the openings for the passage of the air from the space between the
chimney and globe made by punching.
In Figure 2 I have shewn the upper portion of the chimney and the stack made
separately and connected together so as to leave a passage for air between them, the
upper portion of the chimney being more contracted than in Figure 1.
In Figure 3 I have shown the upper portion of the chimney cylindrical and the
stack made a continuation of the chimney. In this instance instead of the space
between the globe and chimney opening into the stack perforations are made in the
upper portion of the hood.
4*1
In Figure 4 I have shewn the upper portion of the chimney extending up into the
stack and the stack and hood made in one piece, with passages between the upper
portion of the chimney and the stack communicating with the space between the
chimney and the globe.
In Figure 5 I have shewn a hood having more taper than has the hood shewn in
Figure 1, and the upper portion of the chimney suspended from the hood. This forin,
although not quite as compact as is that shewn in Figure 1, gives very good results.
Although I prefer to have the globe open at the bottom, so as to have the two
currents of air independent, the globe may be closed at the bottom as shewn in
Figure 5, when the currents of air will be separated after leaving the lower
portion of the chimney, as shewn by the arrows, giving practically the same results
as are obtained by the form shewn in Figure 1.
I may make the lower portion of the lamp chimney contracted at its upper end
as shewn in Figure 6, so that the air passing up through the chimney will be
directed towards the inantle. I may support the stack as shewn by vertical rods
and suspend from the said stack the conical upper portion of the chimney and
mount within the flue an inverted cone as shewn. The reflector is shewn as being
supported by brackets extending from the stack, and suspended above it, is a disc,
which acts as a deflector for the flame.
The combination as hereinbefore described forms a lamp in which a strong draught
is produced, by which the illuminating power of the incandescent mantle is materially
increased.
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 with an incandescent gas lamp of a chimney in two parts, one
part at the base of the mantle, and the other part above the mantle, and a globe
surrounding the chimney and mantle, whereby two currents of air are formed, one

page_text: within the chimney, and the other between the chimney and the globe substantially
as hereinbefore described.
2. The combination with an incandescent gas lamp, of a chimney in two parts, one
part at the lower portion of the mantle and the other part mounted above the mantle,
a stack above the chimney, a hood, a globe below the hood surrounding the chimney
and mantle, with a space between the chimney and the globe, and communicating
with the stack so that two currents of air are formed, one within the chimney and in
contact with the mantle, and the other between the chimney and the globe,
substantially as herein before described.
3. The combination with an incandescent gas lamp of a chimney in two parts,
separated opposite the mantle, a globe surrounding the mantle and chimney and open
to the atmosphere at the bottom, with a hood above the globe and openings for the
escape of heated air from the space between the globe and chimney so that two
currents of air are produced, one through the chimney in close contact with the
mantle and the other between the chimney and the globe, substantially as
herein before described.
4. The combination with an incandescent gas lamp of a chimney in two parts
separated opposite the mantle, the lower portion of the chimney extending to, or
slightly above, the end of the mantle, and open at the bottom, the upper portion
of the chimney being conical, a globe surrounding the chimney and the mantle
and open at the bottom and a hood above the globe, the space between the
mantle and the globe communicating under the hood with the chimney, substantially
as herein before described.
5. The combination with an incandescent gas lamp of a chimney in two parts
separated opposite the mantle, the upper portion of the chimney being in the form
of a cone, a stack into which the upper end of the chimney extends and an
inverted cone mounted directly above the chimney, substantially as hereinbefore
described.
6. The combination with an incandescent gas lamp of a chimney in two parts
separated at the centre opposite the mantle, a hood, a globe extending from the
burner to the hood, and brackets on the hood for supporting the reflector, substantially
as hereinbefore described.
7. The combination with an incandescent gas lamp of a sleeve enclosing the burner
and contracted at its upper end, a conical hood directly above the mantle, a stack
extending to a point below the upper portion of the hood and a globe surrounding
the burner and mantle, substantially as herein before described.
8. The combination with an incandescent gas lamp of a sleeve enclosing the burner,
a stack above the mantle, a globe extending from the burner to the stack and
brackets on the stack for supporting the reflector, substantially as hereinbefore
described.