IMPROVE- MENTS IN PRESERVING ANIMAL SUBSTANCES, AND IN AGENTS FOR THE PURPOSE
Year: 1872

page_text: LETTERS PATENT to Natale Prada, of Trebbin, near Berlin, in the
Kingdom of Prussia (residing temporarily in New Bridge Street,
in the City of London), Chemist, for the Invention of "IMPROVE-
MENTS IN PRESERVING ANIMAL SUBSTANCES, AND IN AGENTS FOR THE PURPOSE."
-Partly a communication from abroad by Pietro Toninetti, residing
at Trebbin, aforesaid.
Scaled the 17th September 1872, and dated the 19th March 1872.
PROVISIONAL SPECIFICATION left by the said Natale Prada at the
Office of the Commissioners of Patents, with his Petition, on the
19th March 1872.
I, NATALE PRADA, of Trebbin, near Berlin, in the Kingdom of Prussia
(residing temporarily in New Bridge Street, in the City of London),
Chemist, do hereby declare the nature of the said Invention for
* IMPROVEMENTS IN PRESERVING ANIMAL SUBSTANCES, AND IN AGENTS FOR THE
PURFOSE," the same being partly the result of my own Invention, and
6

page_text: partly communicated to me from abroad by Pietro Toninetti, residing at
Trebin, aforesaid, to be as follows:-
The main object of this Invention is to preserve animal substances in
order to prepare them for food.
The preservative agent is injected into the veins, or arteries, or heart
of the slaughtered animal, and it is thus injected by preference almost
immediately after the animal has been killed; but animal substances
to be preserved may be treated with the preservative agent otherwise, as
for instance by saturating or otherwise subjecting them to its action.
For a preservative agent acetica, or acetic or acetous acid, or a salt
acid compound, or matter in which the acetic or acetous principle mainly
enters, whether the compound be acid, alkaline, or otherwise, is used, and
therewith I usually combine isinglass.
I produce an excellent preservative agent by combining an acetate or
other compound containing the acetica, acetic or acetous acid or
principle with isinglass.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Natale Prada in the Great Seal Patent Office on
the 19th September 1872.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, NATALE
PRADA, of Trebbin, near Berlin, in the Kingdom of Prussia, formerly
residing temporarily in New Bridge Street, in the City of London,
Chemist, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Nineteenth day of March, in the
year of our Lord One thousand eight hundred and seventy-two, in the
thirty-fifth year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said Natale Prada, Her special licence that
I, the said Natale Prada, my executors, administrators, and assigns,
or such others as I, the said Natale Prada, 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

page_text: 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 PRE-
SERVING ANIMAL SUBSTANCES, AND IN AGENTS FOR THE PURPOSE," the same
being partly the result of my own Invention, and partly commu-
nicated to me from abroad by Pietro Toninetti, residing at Trebbin
aforesaid, upon the condition (amongst others) that I, the said
Natale Prada, my executors or administrators, by an instrument in
writing under my, or their, or one of their hands and seals, should par-
ticularly 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 Natale Prada, 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 object of this Invention is to preserve animal substances in order
to prepare them for food.
The preservative agent is preferably injected into the veins, or arteries, .
or heart of the slaughtered animal, and it is thus injected by preference.
almost immediately after the animal has been killed; but animal sub-
stances to be preserved may be treated with the preservative agents
herein-after described otherwise, as for instance by saturating or other-
wise subjecting them to their action.
For the preservative agents I use "acetica," that is to say, an acetic
or acetous acid, or a salt acid compound or matter in which the acetic
or acetous principle mainly enters (whether the compound be acid,
alkaline, or otherwise), and I therewith sometimes combine isinglass.
I thus produce an excellent preservative agent by combining an acetate
or other compound containing the acetica, acetic, or acetous acid or
principle with isinglass.
I proceed to describe the best mode of carrying the Invention into
practical effect.
The agents which I recommend for the purposes of the Invention are
acetates with pyrolignic or pyroligneous acid, especially the acetate of

page_text: chloride of sodium (salt), together with pyrolignic acid, and in the
following proportions, that is to say :-
For every 10 litres, say 2 gallons, of blood of the ox or animal into
which the preservative agent is to be injected I take, 2 lbs. 3 oz. pyro-
lignic acid; 3 oz. 8 dr. acetate of chloride of sodium dissolved in
1 lb. 9 oz. distilled water; the solution I inject into the carcase of the
slaughtered animal as soon after its death as possible. I inject it near
to the heart or into the carotid artery in the neck.
As soon as the animal is felled or struck down, as is the practice in
most slaughter houses, the carcase is at once placed in such position that
the solution may be readily injected into the veins and arteries according
to the natural or physical system or arrangement thereof, and in order
that the blood may issue from the carcase the heart is immediately per-
forated at the right-hand cavity or chamber. Or, if the carotid artery in
the neck is to be treated the perforation is made therein at any con-
venient part, but in a direction the reverse of that in which the injecting
instrument is to be introduced. Thus in both cases the blood will pass
out or escape to the last drop through these openings, to which it must
flow by reason of the physical or natural system of circulation. The
preservative agent or fluid is then injected by any convenient ordinary
injecting apparatus into the blood through the opening formed as
described.
When the preservative agent or fluid has been injected the carcase is
hung up, and it can be cut up in the usual way.
The isinglass is sometimes dispensed with; also albumen may some-
times be used with the acetic, acetous, or pyroligneous, or pyrolignic acid
or compound in proportions varying according to the description of animal
substance to be preserved, for instance, for fish, 1 part pyroligneous acid
and 2 parts albumen should be used for every 100 parts of the fish.
Having now described the nature of the said Invention, and in what
manner the same may be performed, I declare that I claim,-
First. The preservation of animal substances by the employment of
an agent composed of an acetate, or salt, or other compound containing
the acetic or acetous principle combined with isinglass, or with pyrolignic
or pyroligneous acid, and with or without albumen.
Second. The improved preserving agent described, composed of an

page_text: acetate or of a salt or other compound containing the acetic or acetous
principle, with isinglass, or with pyrolignic or pyroligneous acid, and
with or without albumen.
Third. The injection into the veins, arteries, or heart of the animal to
be preserved of the agents herein-before described and claimed for the
purpose set forth.
In witness whereof, I, the said Natale Prada, have hereunto set
my hand and seal, this Fourteenth day of September, in the
year of our Lord One thousand eight hundred and seventy-
two.