IMPROVED MEANS OF AND PROVISIONAL
Year: 1873

page_text: LETTERS PATENT to Eugen Ernst Johannes Sell, of Berlin, in the
Empire of Germany, at present of 123, Chancery Lane, in the
County of Middlesex, for the Invention of "IMPROVED MEANS OF AND
PROVISIONAL SPECIFICATION left by the said Eugen Ernst Johannes
Sell at the Office of the Commissioners of Patents, with his Petition,
on the 10th October 1873.
I, EUGEN ERNST JOHANNES SELL, of Berlin, in the Empire of
Germany, at present of 123, Chancery Lane, in the County of Middlesex,
do hereby declare the nature of the said Invention for "IMPROVED MEANS
OF AND APPARATUS FOR TAKING PHOTOGRAPHS AT NIGHT," to be as follows:-
1
The new photographic light is produced by burning bi-sulphide of
carbon with peroxide of nitrogen.
As means of combustion I make use of an ordinary petroleum or
other suitable lamp with circular wick, containing bi-sulphide of carbon
instead of oil. Water or other cooling medium surrounds the bi-
sulphide containing chamber to keep it (the said bi-sulphide) cool.

page_text: The peroxide of nitrogen is contained in a metal, glass, or other gas
holder, which may be lined with asphalt.
The peroxide led to the centre of the circular wick of the lamp is
caused to be uniformly mixed with the bi-sulphide by impinging against
a cone placed with its apex downwards within the circular wick.
A stop-cock is used to regulate the pressure of the peroxide, and
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Eugen Ernst Johannes Sell in the Great Seal
Patent Office on the 10th April 1874.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, Eugen
ERNST JOHANNES SELL, of Berlin, in the Empire of Germany, at present
of 123, Chancery Lane, in the County of Middlesex, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Tenth day of October, in the year of
our Lord One thousand eight hundred and seventy-three, in the thirty-
seventh year of Her reign, did, for Herself, Her heirs and successors, give
and grant unto me, the said Eugen Ernst Johannes Sell, Her special
licence that I, the said Eugen Ernst Johannes Sell, my executors, ad-
ministrators, and assigns, or such others as I, the said Eugen Ernst
Johannes Sell, my executors, administrators, and assigns, should at any
time agree with, and no others, from time to time and at all times
thereafter during the term therein expressed, should and lawfully might
make, use, exercise, and vend, within the United Kingdom of Great
Britain and Ireland, the Channel Islands, and Isle of Man, an
Invention for "IMPROVED MEANS OF AND APPARATUS FOR TAKING PHOTOGRAPHS
AT NIGHT," upon the condition (amongst others) that I, the said Eugen
Ernst Johannes Sell, my executors or administrators, by an instru-
ment in writing under my, or their, or one of their hands and seals,
should particularly describe and ascertain the nature of the said In-
vention, and in what manner the same was to be performed, and
cause the same to be filed in the Great Seal Patent Office within six

page_text: calendar months next and immediately after the date of the said Letters
Patent.
NOW KNOW YE, that I, the said Eugen Ernst Johannes Sell, do
hereby declare the nature of my said Invention, and in what manner
the same is to be performed, to be particularly described and ascertained
in and by the following statement (that is to say) :—
My Invention consists in producing a new photographic light by
burning bi-sulphide of carbon with peroxide of nitrogen.
As means of combustion I make use of an ordinary petroleum or other
suitable lamp with circular wick, containing bi-sulphide of carbon
instead of oil. Water or other cooling medium surrounds the bi-sulphide
containing chamber to keep it (the said bi-sulphide) cool.
The peroxide of nitrogen is contained in a metal, glass, or other gas
holder, which may be lined with asphalt or other suitable material.
The peroxide led to the centre of the circular wick of the lamp
is caused to be uniformly mixed with the bi-sulphide by impinging
against a cone placed with its apex downwards within the circular wick.
A stop-cock is used to regulate the pressure of the peroxide, and
means are provided to carry away the products of combustion.
A reflector is used, when necessary, to direct and condense the light.
Having thus described and ascertained the nature and particulars of
my said Invention, I claim, the improved means of and apparatus for
taking photographs at night, substantially as set forth.
In witness whereof, I, the said Eugen Ernst Johannes Sell, have
hereunto set my hand and seal, this Second day of April, in the
year of our Lord One thousand eight hundred and seventy-four.
EUGEN ERNST JOHANNES SELL. (L.S.)