IMPROVEMENTS IN THE TREATMENT OF SEWAGE DEPOSITS OR PRECIPITATES, OR SEWAGE SLUDGE, IN ORDER TO OBTAIN THEREFROM AMMO
Year: 1875

page_text: LETTERS PATENT to John William Slater, of No. 2, Tamworth
Terrace, in the County of Middlesex, Analytical Chemist, for the
Invention of "IMPROVEMENTS IN THE TREATMENT OF SEWAGE DEPOSITS OR
PRECIPITATES, OR SEWAGE SLUDGE, IN ORDER TO OBTAIN THEREFROM AMMONIA,
Terrace, in the County of Middlesex, Analytical Chemist, for the
Invention of "IMPROVEMENTS IN THE TREATMENT OF SEWAGE DEPOSITS OR
PRECIPITATES, OR SEWAGE SLUDGE, IN ORDER TO OBTAIN THEREFROM AMMONIA,
PROVISIONAL SPECIFICATION left by the said John William Slater
at the Office of the Commissioners of Patents, with his Petition,
on the 21st October 1875.
I, JOHN WILLIAM SLATER, of No. 2, Tamworth Terrace, in the
County of Middlesex, Analytical Chemist, do hereby declare the nature
of the said Invention for "IMPROVEMENTS IN THE TREATMENT OF SEWAGE
DEPOSITS OR PRECIPITATES, OR SEWAGE SLUDGE, IN ORDER TO OBTAIN THEREFROM
AMMONIA, ILLUMINATING GAS, AND OTHER USEFUL PRODUCTS," to be as
follows:-

page_text: obtained by precipitating sewage (either according to the process known
as the "A, B, C, process," or according to other processes) is carbonized
for the purpose of obtaining therefrom a carbonaceous residue which is
useful in purifying sewage and for other purposes.
In carbonizing the said deposits according to the usual process the 5
volatile products of the destructive distillation are either allowed to
escape into the open air or are passed into the furnace. Now my
Invention consists in utilizing the said volatile products, or some of
them, as hercin-after described.
I pass
the said volatile products from the retort through condensing 1
and purifying apparatus similar to that in use in gasworks, and thus
obtain ammonia, tarry or oily products, and illuminating gas, the illumi-
nating power of which may be increased by passing it through volatile
hydrocarbons, as is done with other illuminating gas.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said John William Slater in the Great Seal Patent
Office on the 21st April 1876.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOHN
WILLIAM SLATER, of No. 2, Tamworth Terrace, in the County of
Middlesex, Analytical Chemist, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-first day of October, in the
year of our Lord One thousand eight hundred and seventy-five, in
the thirty-ninth year of Her reign, did, for Herself, Her heirs and suc-
cessors, give and grant unto me, the said John William Slater, Her
special license that I, the said John William Slater, my executors,
administrators, and assigns, or such others as I, the said John William
Slater, my executors, administrators, and assigns, should at any time
agree with and no others, from time to time and at all times there-
after during the term therein expressed, should and lawfully might
make, use, exercise, and vend, within the United Kingdom of Great

page_text: Britain and Ireland, the Channel Islands, and Isle of Man, an In-
vention for "IMPROVEMENTS IN THE TREATMENT OF SEWAGE DEPOSITS OR
PRECIPITATES, OR SEWAGE SLUDGE, IN ORDER TO OBTAIN THEREFROM AMMONIA, ILLU-
MINATING GAS, AND OTHER USEFUL PRODUCTS," upon the condition (amongst
others) that I, the said John William Slater, my executors or admini-
strators, by an instrument in writing under my, or their, or one of
their hands and seals, should particularly describe and ascertain the
nature of the said Invention, and in what manner the same was to
be performed, and cause the same to be filed in the Great Scal
Patent Office within six calendar months next and immediately after
the date of the said Letters Patent.
NOW KNOW YE, that I, the said John William Slater, do hereby
declare the nature of the said Invention, and in what manner the
same is to be performed, to be particularly described and ascertained
in and by the following statement thereof, that is to say :-
My Invention relates to processes in which the nitrogenous deposits
obtained by precipitating sewage (either according to the process known
as the A, B, C, process, or according to any other processes in which
clay or charcoal, or clay and charcoal is, arc, or may be used) are car-
bonised for the purpose of obtaining therefrom a carbonaceous residue
which is useful in purifying sewage and for other purposes.
In carbonising the said deposits according to the usual process the
gases or volatile products of the destructive distillation are either allowed
to escape into the open air or are passed into the furnace. Now my
Invention consists in utilizing the said gases or volatile products, or some
of them, as herein-after described.
I pass the said gases or volatile products from the retort through con-
densing and purifying apparatus similar to that in use in gasworks, and
thus obtain ammonia, tarry or oily products, and illuminating gas, the
illuminating power of which may be increased by passing it through
volatile hydrocarbons, as is done with other illuminating gas.
In carrying my Invention into effect I pass the said gases or volatilo
products from the retort into a hydraulic main, so as to condense their
tarry and oily constituents and other heavy matters which such gasos

page_text: urifying the said gases, as herein-before described, so as to obtain
herefrom ammonia, illuminating gas, and other useful products.
In witness whereof, I, the said John William Slater, have here-
unto set my hand and seal, this Twenty-first day of April, in
the year of our Lord One thousand eight hundred and seventy-
six.
Witness,
H. H. MURDOCH,
Staple Inn,
J. W. SLATER. (L.S.)
London.