IMPROVEMENTS IN THE MANUFACTURE OF ISINGLASS, GELATINE, AND GLUE
Year: 1877

page_text: LETTERS PATENT to Peter Jensen, of Chancery Lane, London, for the Invention
of "IMPROVEMENTS IN THE MANUFACTURE OF ISINGLASS, GELATINE, AND GLUE."
A communication from abroad by Carl Adolf Sahlstrom, of Stockholm,
Sweden.
Sealed the 31st May 1878, and dated the 1st December 1877.
PROVISIONAL SPECIFICATION left by the said Peter Jensen at the Office of
the Commissioners of Patents on the 1st December 1877.
PETER JENSEN, of Chancery Lane, London. IMPROVEMENTS IN THE MANU-
FACTURE OF ISINGLASS, GELATINE, AND GLUE" (A communication from abroad by
Carl Adolf Sahlström, of Stockholm, Sweden.)
The object of this Invention is to manufacture isınglass, gelatine, and glue from
fish offal, all as herein-after described.
The fish or fish parts are first soaked well in water, they are then left some three
or four hours in a water solution of chloride of lime (say 16 of water to 1 of
chloride of lime); the material is then rinsed and treated for about 20 or 30 minutes
with a solution of about 300 parts water and one part of supermanganate of alkali;
it is then exposed to the action of nitrous acid vapours, generated through heating
of about a quarter cubic foot of concentrated nitric acid for every hundred-weight
of material.
The sulphurous acid may be first absorbed by the water as is used in the mann-
facture of sugar for purifying the syrup. The material is then rinsed, and all skin
parts are removed, which are to be made into singlass; the rest is dried with a slow
heat and pressed.
The parts destined for gelatine and glue are for a space of about 10 or 12 hours
exposed to a temperature of about 100 or 120° F., most of it is then small and is
strained; after standing some hours it is dried as ordinary gelatine and glue.
Instead of the nitrous acid sulphurous acid may be used, which is generated by
burning about half a pound of sulphur for every hundred-weight of material.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Peter Jensen in the Great Seal Patent Office on the 1st June 1878.
PETER JENSEN, of Chancery Lane, London. "IMPROVEMENTS IN THE Manu-
FACTURE OF ISINGLASS, GELATINE, AND GLUE." (A communication from abroad by
Carl Adolf Sahlstrom, of Stockholm, Sweden.)
The object of this Invention is to manufacture isinglass, gelatine, and glue from
fish offal, all as herein-after dèscribed.
The fish or fish parts are first soaked well in water, they are then left some three
or four hours in a water solution of chlorid of lime (say 16 of water to 1 of chlorid
of limo); the material is then rinsed and treated for about 20 or 30 minutes with a
solution of about 300 parts water and 1 part of supermanganate of alkali; it is
then exposed to the action of nitrous acid vapours generated through heating of
about a quarter cubic foot of concentrated nitric acid for every hundred-weight of
material.
The sulphurous acid may be first absorbed by the water as is used in the manu-
facture of sugar for purifying the syrup. The material is then rinsed, and all skin
parts are removed which are to be made into isinglass; the rest is dried with a slow
heat and pressed.
The parts destined for gelatine and glue are for a space of about 10 or 12 hours
exposed to a temperature of about 100 or 120° F.; most of it is then small and is 1
strained; after standing some hours it is dried as ordinary gelatine and glue.
Instead of the nitrous acid sulphurous acid may be used, which is generated by
burning about half a pound of sulphur for every hundred-weight of material.
And having thus described this Invention I declare that I claim, the manufacture
of isinglass, gelatine, and glue from fish offal by the application of nitrous or
sulphurous acid, substantially in the manner herein-before set forth.
In witness whereof, I, the said Peter Jensen, have hereunto set my hand and
seal, this First day of June, in the year of our Lord One thousand eight
hundred and seventy-eight.
DEARD TRACTAT