AN IMPROVED METHOD OF CONDENSING MILK AND PRESERVING THE SAME
Year: 1881

page_text: LETTERS PATENT to Frank Wirth, of the Firm of Wirth and Company, Patent
Solicitors, at Frankfort on the Main, in the Empire of Germany, for an
Invention of " AN IMPROVED METHOD OF CONDENSING MILK AND PRESERVING
THE SAME." A communication from Paul Friedrich Gaupp, Apothecary, of
Romanshorn, in the Republic of Switzerland.
PROVISIONAL SPECIFICATION left by the said Frank Wirth at the Office
of the Commissioners of Patents on the 9th March 1881.
FRANK WIRTH, of the Firm of Wirth and Company, Patent Solicitors, at
Frankfort on the Main, in the Empire of Germany. "AN IMPROVED METHOD OF
CONDENSING MILK AND PRESERVING THE SAME.' [A communication from Paul
Friedrich Gaupp, Apothecary, of Romanshorn, in the Republic of Switzerland.]
This Invention relates to an improved method of condensing milk and preserving
the same. By the said method I am enabled to condense milk to the extent of
seventy five (75) per cent. of its bulk, and to maintain the same in good condition
for a practically unlimited time without adding to the milk treated by my method
foreign matter of any kind.
In carrying the said Invention into practice I heat the milk in a suitable vessel
to sixty (60) degrees Reaumur, and then pump it into a vacuum apparatus, where I
reduce its bulk by seventy five (75) per cent. The milk is then, whilst hot, put into
tin boxes or cans, and the latter are hermetically closed. When the boxes are thus
filled and closed I place the same into a bath of chloride of calcium and heat the
same to eighty-five (85) degrees Reaumur.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Frank Wirth in the Great Seal Patent Office on the 8th September
1881.
FRANK WIRTH, of the Firm, of Wirth and Company, Patent Solicitors, at
Frankfort-on-the-Main, in the Empire of Germany.
"AN IMPROVED METHOD OF
CONDENSING MILK AND PRESERVING THE SAME.' A communication from Paul
Friedrich Gaupp, Apothecary, of Romanshorn, in the Republic of Switzerland.
This Invention relates to an improved method of condensing milk and preserving
the same. By the same method I am enabled to condense milk to the extent of
seventy five (75) per cent. of its bulk; and to maintain the same in good condition
for a practically unlimited length of time without adding to the milk foreign matter
of any kind.
In carrying the said Invention into practice I heat the milk in a suitable vessel
to sixty (60) degrees Reaumur, and then pump it into a vacuum apparatus, in which
I reduce its bulk to the extent of seventy five (75) per cent. The milk is then,
whilst hot, put into tin boxes or cans, and the latter when filled are hermetically
closed. When the boxes are filled and closed I place the same in a bath or solution
of chloride of calcium, and heat the same to eighty five (85) degrees Reaumur.
Instead of chloride of calcium, however, I may employ any other liquid which is
capable of being heated to eighty-five (85) degrees Reaumur in open vessels, or of
being heated to the same extent in a closed vessel or when under pressure.
Having thus fully described the said Invention and the manner of performing
the same, I wish it understood that I claim,-
The method of condensing milk and preserving the same, substantially as above
Bet forth.
In witness whereof, I, the said Frank Wirth, have hereunto set my hand
and seal, this Fifth day of September, in the year of our Lord One
thousand eight hundred and eighty one.
FRANK WIRTH. (L.S.)