IMPROVEMENTS. IN AR Me DEARED AS DISINFECTANTS
Year: 1863

page_text: LETTERS PATENT to Alexander Angus Croll, of Coleman Street, in the
City of London, Engineer, for the Invention of "IMPROVEMENTS. IN
AR
Me
DEARED AS DISINFECTANTS
Sealed the 12th April 1864, and dated the 22nd October 1863.
PROVISIONAL SPECIFICATION left by the said Alexander Angus Croll.
at the Office of the Commissioners of Patents, with. his Petition; on.
the 22nd October 1863.
I, ALEXANDER ANGUS CROLL, of Coleman Street, in the City of London,
Engineer, do hereby declare the nature of the said Invention for "IMPROVE-
MENTS IN THE PREPARATION OF MATTERS TO BE EMPLOYED AS DISINFECTANTS," to be
as follows:-
The improvements relate to combining chloride or sulphate of manganese
with wood sawdust, breeze, spent tan, or other slightly absorbent or cellular
material, and employing such combined matters as disinfectants.
I prefer that the salt to be mixed be in a concentrated form, and that it be
combined with the other matter or matters at or about the boiling point..
The proportions I find to answer are 5 parts by weight of the salt of manga-
nese to 1 part by weight of dry wood sawdust. I do not, however, confine
myself to these proportions, and when combining any of the matters with the
salt of manganese I prefer to use such a quantity of the salt as will in the
combination afford a mixture comparatively dry.

page_text: 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 22nd April 1864.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, ALEXANDER
ANGUS CROLL, of Coleman Street, in the City of London, Engineer, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twenty-second day of October, in the year of
our Lord One thousand eight hundred and sixty-three, in the twenty-seventh
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, adminis
trators, 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 PREPARATION OF MATTERS TO BE
EMPLOYED AS DISINFECTANTS," upon the condition (amongst others) that I,.the
said Alexander Angus Croll, 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 Invention, 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 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 performed, to be particularly described and ascertained in and by the
following statement thereof, that is to say :-
The improvements relate to combining chloride or sulphate of manganese
with wood sawdust, breeze, spent tan, or other slightly absorbent or cellular
material, and employing such combined matters as disinfectants.
I prefer that the salt to be mixed be in a concentrated form, and that it be
combined with the other matter or matters at or about the boiling point.
I first evaporate the salt employed till it becomes semi-fluid, and until the
temperature thereof has attained about, say, 230° (Fahrenheit), and is of a
specific gravity of, say, about 120° (Twaddle) when it is to be mixed with dry
wood sawdust or with other slightly absorbent or cellular matter, but I prefer

page_text: generally the combination to be with the wood sawdust, and in that case
I find about five parts by weight of the salt of manganese to one part by
weight of the wood sawdust answers well. I also prefer to add a small
quantity of pounded chalk to the salt of manganese previous to its admixture
with the sawdust, in order to neutralize any free acid which may still exist in
such salt; and I prefer to use such a quantity of the salt as will in the com-
bination afford a mixture comparatively dry.
Having thus described the nature of my Invention, and means which I
adopt in carrying the same into effect, I would have it understood that I do
not confine myself to the precise details referred to, as these may be varied;
but what I do claim is the use or application of chloride or sulphate of manga-
nese with wood sawdust, breeze, spent tan, or other slightly absorbent or
cellular material as a disinfectant.
In witness whereof, I, the said Alexander Angus Croll, have hereunto set
my hand and seal, this Twentieth day of April, in the year of our Lord
One thousand eight hundred and sixty-four.
A. ANGUS CROLL. (L.S.)