A Process for the Production of Incandescent Gas Light.
Year: 1899

page_text: Date of Application, 14th June, 1899-Accepted, 5th Aug., 1899
A Process for the Production of Incandescent Gas Light.
A communication from ERNST SALZENBERG, Manager, of 1, Mariannenstrasse,
Krefeld, Germany.
I, ALFRED JULIUS BOULT, of 111, Hatton Garden, in the County of London,
Chartered Patent Agent, do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement:-
-
The object of the present invention is a process for the production of incan-
descent gas light which is characterized by a high lighting power and a relatively
small consumption of gas, having a yellowish colour and an even
radiation of light in all directions, gas at a pressure of at least one
atmosphere above ordinary atmospheric pressure being introduced into the
incandescence body or mantle which is of special strength and of small meshed
construction, and secured to the burner by loosely arranged threads.
In making use of such a high pressure of a gas, which necessitates a strong
mantle specially prepared for this purpose, the mantle is expanded like a balloon
whilst the gas is burning and thus gives an even incandescence over the whole
surface.
It has already on previous occasions been proposed to augment the pressure of
the gas, which proved possible with the ordinary mantles, to the extent of only
one-fifth atmosphere of over-pressure; by these means however results could
only be obtained which were satisfactory quantitively but not qualitatively, such
as stated above.
To carry out the process it is necessary to employ an incandescence-body or
mantle in connection with an over-pressure of gas of one atmosphere or more,
which should be ball-shaped or otherwise suitably shaped, or a mantle which
owing to its structure will be blown out like a balloon by the high pressure
gas. The mantle must be able to withstand the high pressure and be possessed
of the narrowest possible orifices or meshes and must be finally firmly connected
with the burner to prevent it being blown off in consequence of the high pressure
of gas. In using the ordinary mantle fabric of impregnated textile material,
two or more of such fabrics are arranged one upon another previous to being
incinerated, so that the meshes of one are covered by the threads of the material
of the next, owing to which arrangement narrow passages are formed; or very
fine meshed fabrics may be used in the first instance for the production of the
mantles. These mantles are fastened to the burners by means of fire resisting
threads made of asbestos or the like or by means of metal wires, so that gas under
high pressure cannot blow the mantle off the burner. The means for fastening
however must admit of a change of shape and surface circumference of the mantle
inasmuch as the latter will be blown out or inflated in consequence of the
pressure of the gas.

page_text: Having now particularly described and ascertained the nature of this said
invention as communicated to me by my foreign correspondent, and in what
manner the same is to be performed, I declare that what I claim is:-
1-
A process for the production of incandescent gas light of high lighting power
and of great economical productiveness and having a yellowish colour and even
radiation in all directions, consisting in the introduction of gas under a pressure
of one atmosphere or more above ordinary atmospheric pressure into a close
meshed mantle capable of being inflated or expanded and secured to the burner
by means of threads, substantially as described.
Dated this 14th day of June 1899
BOULT & WADE,
Agents for the Applicant.