IMPROVEMENTS IN THE TREATMENT OF LIQUORS CONTAINING COMBINATIONS OF SULPHUR WITH AMMONIA
Year: 1857

page_text: LETTERS PATENT to Alexander Angus Croll, of Harold's Wood Lodge,
near Romford, in the County of Essex, Civil Engineer, for the Invention
of "IMPROVEMENTS IN THE TREATMENT OF LIQUORS CONTAINING COMBINATIONS
OF SULPHUR WITH AMMONIA."
Sealed the 18th December 1857, and dated the 3rd July 1857.
PROVISIONAL SPECIFICATION left by the said Alexander Angus Croll at
the Office of the Commissioners of Patents, with his Petition, on the
3rd July 1857.
I, ALEXANDER ANGUS CROLL, of Harold's Wood Lodge, near Romford, in the
County of Essex, Civil Engineer, do hereby declare the nature of the said
Invention for "IMPROVEMENTS IN THE TREATMENT OF LIQUORS CONTAINING
COMBINATIONS OF SULPHUR WITH AMMONIA," to be as follows:-
In treating the ammoniacal liquors of gasworks and other liquors con-
taining combinations of sulphur and ammonia with acids to obtain salts; it is
usual to admit the acids thereto in open vessels (called saturating vessels), by
which sulphuretted hydrogen gas becomes liberated, and mixes with the atmo-
sphere to the injury of animal life; or when such processes have been carried on
in closed vessels, they have generally been in order that the impure gus evolved
might be conducted to chimney or stack; and my improvements consist in
forming the saturating vessels closed, and in applying thereto a pipe or pipes

page_text: in connection with a purifying vessel containing oxide of iron or other puri-
fying media, by which the deleterious gas is at once conducted from the
saturating vessel to the purifier, and becomes absorbed or deprived of the
deleterious influence, in place of injuriously passing into the atmosphere.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Alexander Angus Croll in the Great Seal Patent Office on
the 2nd January 1858.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, ALEXANDER
ANGUS CROLL, of Harold's Wood Lodge, near Romford, in the County of
Essex, Civil Engineer, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Third day of July, in the year of our Lord One
thousand eight hundred and fifty-seven, in the twenty-first year of Her reign,
did, for Herself, Her heirs and successors, give and grant unto me, the said
Alexander Angus Croll, Her special licence that I, the said Alexander Angus
Croll, my executors, administrators, and assigns, or such others as I, the said
Alexander Angus Croll, 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 "IMPROVEMENTS IN
THE TREATMENT OF LIQUORS CONTAINING COMBINATIONS OF SULPHUR WITH AMMONIA,"
upon the condition (amongst others) that I, the said Alexander Angus Croll,
my executors or administrators, 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 per-
formed, and cause the same to be filed in the Great Seal Patent Office within
six calendar months next and immediately after the date of the said Letters
Patent.
NOW KNOW YE, that I, the said Alexander Angus Croll, do hereby declare
the nature of the said Invention, and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement thereof, that is to say :-
In treating the ammoniacal liquors of gasworks and other liquors con-
taining combinations of sulphur and ammonia with acids to obtain salts, it is
usual to admit the acids thereto in open vessels (called saturating vessels), by

page_text: which sulphuretted hydrogen gas becomes liberated and mixes with the
atmosphere to the injury of animal life; or when such processes have been
carried on in closed vessels, they have generally been in order that the impure
gas evolved might be conducted to a chimney or stack.
My improvements consist in forming the saturating vessels closed, and in
applying thereto a pipe or pipes in connection with a purifying vessel con-
taining oxide of iron or other purifying media, by which the deleterious gas
is at once conducted from the saturating vessel to the purifier, and becomes
absorbed or deprived of the deleterious influence, in place of injuriously passing
into the atmosphere.
I prefer to use oxide of iron for the purpose, as the most economical, on
account of its ready re-conversion after use upon exposure to the oxygen of the
atmosphere.
In witness whereof, I, the said Alexander Angus Croll, have hereunto
set my hand and seal, this First day of January, in the year of our
Lord One thousand eight hundred and fifty-eight.
Witness,
WILLIAM BROOKES, Patent Agent,
73, Chancery Lane, London.
A. ANGUS CROLL. (L.S.)