Improvements in the Manufacture of Mantles or Incandescing Bodies for Incandescent Gas Lamps.
Year: 1896

page_text: Date of Application, 24th Nov., 1896
Complete Specification Left, 23rd Aug., 1897-Accepted, 25th Sept., 1897
KOVISIONAL SPECT
Improvements in the Manufacture of Mantles or Incandescing Bodies
for Incandescent Gas Lamps.
I, JOHN FREDERICK DUKE of 160 Rosendale Road, West Dulwich in the County
of London, Chemist, do hereby declare the nature of this invention to be as
follows:-
My invention has reference to the manufacture of mantles or incandescing bodies
(hereinafter referred to as mantles) for incandescent gas lamps and its object is to
render them self lighting by the action of gas itself (when this is turned on) upon
an automatic gas igniter preferably of the kind described in the Specification of
my Patent No. 969 of 1895 that is to say a block of meerschaum or other porous
material containing platinum black in its pores.
According to my present invention I draw or paint a line (preferably a very
fine line) of highly concentrated solution of platinum bi-chloride from the upper
part of the mantle towards the lower part. This is preferably done before the
tulle or foundation of the mantle has been burnt out. After the tulle has been
burnt out, during which process the platinum bi-chloride will be converted into
metallic platinum, I apply over the line of platinum a streak of solution of
carbonate of lime or any other metallic oxide suitable for the purp-se containing
an exceedingly small proportion of platinum bi-chloride; the solution of carbonate
of lime can readily be obtained from a solution of hydrate of lime in a saturated
solution of carbonic dioxide in water, or by other suitable process, the solution
also containing a solution of the very exceeding small proportion of platinum
bi-chloride. I have found that one part of platinum bi-chloride to 20,000 parts
of carbonate of lime is a suitable proportion for the purpose of this invention.
The bi-chloride of platinum so contained becomes converted into metallic platinum
on its being submitted to the heat of the gas flame.
To the outside of the mantle and in contact with the upper end of the line of
platinum I fit the porous block such as hereinbefore referred to which contains
platinum black in its pores.
When the gas is turned on and comes in contact with the porous block this
becomes heated to a red heat; this heat is communicated to the line of platinum
on the mantle, and this platinum in its turn communicates it to the carbonate of
lime with which the very small amount of platinum has become mixed by the
addition of platinum bi-chloride. Owing to the presence of this finely divided
platinum in the carbonate of lime the carbonate of lime is converted by the heat
into oxide of lime which becomes incandescent and ignites the gas.
Dated this 24th day of November 1896.
J. C. MEWBURN & ELLIS,
55 and 56 Chancery Lane, London, Chartered Patent Agents.

page_text: Improvements in the Manufacture of Mantles or Incandescing Bodies
for Incandescent Gas Lamps.
I, JOHN FREDERICK DUKE of 160 Rosendale Road, West Dulwich in the County
of London, Chemist, 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:-
My invention has reference to the manufacture of mantles or incandescing
bodies (hereinafter referred to as mantles) for incandescent gas lamps and its
object is to render them self lighting by the action of the gas itself (when this is
turned on) upon an automatic gas igniter preferably of the kind described in the
Specification of my Patent No. 969 of 1895 that is to say a block of meerschaum
or other porous material containing in its pores platinum black or any suitable
metal of the platinum group or a combination of such metals.
According to my present invention I draw or paint a line (preferably a very fine
line) of highly concentrated solution of platinum bi-chloride from the upper part
of the mantle towards the lower part. This is preferably done before the tulle or
foundation of the mantle has been burnt out. After the tulle has been burnt out,
during which process the platinum oi-chloride will be converted into metallic
platinum, I apply over the line of platinum a streak of solution of carbonate of
lime, or any other metallic oxide suitable for the purpose containing an exceedingly
small proportion of platinum bi-chloride; the solution of carbonate of lime can
readily be obtained from a solution of hydrate of lime in a saturated solution of
carbonic dioxide in water or by other suitable process the solution also containing
a solution of the very exceeding small proportion of platinum bi-chloride.
have found that one part of platinum bi-chloride to 20,000 parts of the carbonate
of lime solution is a suitable proportion for the purpose of this invention. The
bi-chloride of platinum so contained becomes converted into metallic platinum
on its being submitted to the heat of the gas flame.
I
To the mantle and in contact with the upper end of the ane of platinum I fit
the porous block such as herein before referred to which contains platinum black
or other suitable metal of the platinum group in its pores.
When the gas is turned on and comes in contact with the porous block this
becomes heated to a red heat; this heat is communicated to the line of platinum
on the mantle, and this platinum in its turn communicates it to the lime with
which the very small amount of platinum has become mixed by the addition of
platinum bi-chloride. Owing to the presence of this finely divided platinum the
heat is transmitted from the platinum line to the carbonate of lime which is
thereby converted into oxide of lime which becomes incandescent and ignites
the gas.
From the description hereinbefore given it will be seen that the self lighting
action of the mantle depends first upon the platinum line which transmits the
heat from the porous block down the mantle and secondly upon the small amount
of finely divided metallic platinum in the metallic oxide in what I have herein-
before called the streak and which platinum causes the heat to be transmitted from
the platinum line to the said metallic oxide so that this becomes incandescent.
The streak may be more or less wide and may even extend over the whole mantle,
in which case the metallic oxide with the small amount of finely divided platinum
mixed with it may be conveniently applied by dipping the mantle in the requisite
solution. The solution may then be a solution of the refractory metals ordinarily
employed in making the mantles, but containing the very small proportion of

page_text: platinum bi-chloride. In such case the invention may be carried out as follows:-
I first apply the line of highly concentrated solution of platinum bi-chloride
to the tulle or foundation of the mantle. I then dry this line at a temperature
sufficiently high (say 400° Fahrenheit) to convert the bi-chloride into mono-
chloride which being insoluble in water will have no tendency to spread when the
tulle is subsequently dipped in the solution. I then dip the tulle in a solution of
refractory metals such as are ordinarily employed in manufacturing incandescing
mantles, but containing an exceedingly small proportion, say 1 in 40,000 of
platinum bi-chloride. I then treat the impregnated tulle in the manner ordinarily
followed in producing incandescing mantles during which treatment the platinum
bi-chloride in the fine line and also that which is finely distributed throughout
the mantle becomes converted into metallic platinum.
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 a mantle or incandescing body for incandescent gas lamps, the combination
with an automatic gas igniter of a line of metallic platinum in a finely divided
state on the said body and in contact with the said igniter and a streak of incan-
descing material mixed with a very small proportion of metallic platinum in a
finely divided state this streak being applied upon the said line substantially as
and for the purpose set forth.
2. A mantle or incandescing body for incandescent gas lamps having a very
small proportion of metallic platinum in a finely divided state mixed with the
incandescing material of the body or of part of the same, a line of metallic platinum
in a finely divided state on the said body and an automatic gas igniter with which
the said line is in contact substantially as and for the purpose set forth.
3. For use in combination with an automatic gas igniter such as that herein-
before referred to, a mantle or incandescing body having a very small proportion.
of metallic platinum in a finely divided state mixed with the incandescing material
of the body or of part of same and a line of metallic platinum in a finely
divided state on the said body substantially as set forth.
4. The manufacture of mantles or incandescing bodies for incandescent gas
lamps, substantially as hereinbefore described.
09.11
S1907
J. C. MEWBURN & ELLIS,
55 and 56 Chancery Lane, London, Chartered Patent Agents.