IMPROVEMENTS IN MANUFACTURING CONDENSED OR SOLIDIFIED MILK PART OF WHICH ARE ALSO APPLICABLE TO THE Amban
Year: 1882

page_text: LETTERS PATENT to William Frost Sweetland, of Hendon in the County of
Middlesex, Gentleman for an invention of "IMPROVEMENTS IN MANUFACTURING
CONDENSED OR SOLIDIFIED MILK PART OF WHICH ARE ALSO APPLICABLE TO THE
Amban
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PROVISIONAL SPECIFICATION left by the said William Frost Sweetland
at the Office of the Commissioners of Patents on the 18th March 1882.
WILLIAM FROST SWEETLAND of Hendon in the County of Middlesex Gentleman
IMPROVEMENTS IN MANUFACTURING CONDENSED OR SOLIDIFIED MILK PART OF
WHICH ARE ALSO APPLICABLE TO THE MANUFACTURE OF CONDENSED SUBSTANCES FROM
OTHER LIQUIDS.
This Invention has for its object specially the manufacture of condensed milk
without the use of additional sugar as is now ordinarily the case.
The Invention is based upon the addition to the milk during the process of
concentration of a gelatinous substance or a solution of a gelatinous substance the
presence of which even in very small quantity causes the milk to assume either a
gelatinous character or a desiccated character according to the degree to which the
concentration has been carried
The substance which I prefer to use for this purpose is known as gelos or
gelose but certain other extracts from other species of seaweed and lichens are also
available.
To carry out the Invention I prefer to concentrate the milk in a vacuum pan
without the addition of sugar until some portion of the water contained in the
milk has been driven off & then to add to the contents of the vacuum pan a
concentrated watery solution of the gelose or other gelatinous material.
Immediately on the completion of the concentration I draw off the concentrated
mass from the vacuum pan and fill it into tins which are afterwards soldered down
preferably while warm.
It is not generally necessary to heat the milk in the tins.
Condensed milk prepared in this way is more soluble than ordinary condensed
milk and is free from the undesirable qualities possessed by milk to which a
considerable proportion of sugar has been added.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said William Frost Sweetland in the Great Seal Patent Office on the
16th September 1882.
WILLIAM
FROST SWEETLAND of Church End Farm Hendon Gentleman
"IMPROVEMENTS IN MANUFACTURING CONDENSED OR SOLIDIFIED MILK PART OF
WHICH ARE ALSO APPLICABLE TO THE MANUFACTURE OF CONDENSED SUBSTANCES
FROM OTHER LIQUIDS
"
The said Invention relates to certain improvements in manufacturing condensed
or solidified Milk.
The Invention has for its object the Manufacture of condensed Milk without the
addition of the large amount of Sugar which is ordinarily added to condensed
Milk as at present sold in order to preserve it.
The Invention is based upon the addition to the Milk during the process of
concentration of a gelatinous substance or a solution of a gelatinous substance the
presence of which even in very small quantity causes the Milk to assume either a
gelatinous character or a desiccated character according to the degree to which the
concentration has been carried.
The gelatinous substance which I prefer to use for this purpose is known as gelos
or gelose but other extracts from certain species of Seaweed and lichens are also
available.
I prefer to concentrate the Milk in a vacuum pan until some portion of the
water has been driven off and then to add the gelose or other gelatinous material
or a concentrated watery solution of it to the contents of the vacuum pan.
Immediately on the completion of the concentration I draw off the mixture of
concentrated Milk and gelatinous materials from the vacuum pan and fill it inio
tins or other suitable vessels which are closed preferably while the contents are
warm. It is not generally necessary to beat the Milk in the tins.
In carrying the Invention into practical use I prefer to proceed as follows
I use
a vacuum pan of ordinary construction or form but which has by
preference been Silvered or Tinned inside, I concentrate the Milk therein in the
usual manner until Two thirds or Three fourths of the contained water have
been boiled off taking necessary precautions against rise of temperature or boiling
over.
Meanwhile I have prepared a concentrated solution of the gelatinous material
which I use (which is by preference gelose) in hot water-I. make this solution as
concentrated as possible in fact to the consistency of a thick paste-when warm
I draw or force this concentrated solution into the vacuum pan so as to mix it with
the concentrated Milk through a tube connected with the vacuum pan or in any
other suitable way-The proportion which I prefer to add is from 30 to 50 grains
of the gelatinous material to every gallon of the pure Milk being concentrated.
The proportion requisite is dependent to some extent on the length of time for
which the Milk is required to be kept or the degree of solidity which it is required
to obtain in it, 30 grains per gallon would be sufficient when the Milk is required
to be kept for a short time time only and to be in a very readily soluble form,
while 50 or in some cases even 60 grains per gallon may be necessary when the
Milk has to be kept for a long time and brought into an extremely condensed or an
almost solidified form.
As soon as possible after the addition of the gelatinous solution the concentration
in the pan is completed.
Sometimes I prefer to add the gelatinous material in a finely divided condition

page_text: but in a solid form to the partially concentrated Milk in the vacuum pan and allow
it to dissolve in the Milk.
The treatment in other respects is the same.
In either case the Milk and gelatinous Material are as soon as sufficiently
concentrated run out from the vacuum pan into tins or other suitable packing
vessels. This should be done while the Milk is at a reasonably high temperature.
The vacuum in the pan being reduced so as to increase the temperature.
If the heat of the Milk is sufficiently raised in this way it is not necessary to
heat it when in the tins.
When this unsweetened condensed Milk is to be used on a large scale it is not
necessary to use soldered down tins-screw down tins or large stoppered bottles
will be quite sufficient to preserve it for a reasonable period.
When the Milk is to be kept for a longer period or to be used for export it is
desirable to solder the tins.
Condensed Milk prepared in this way is free from the large amount of saccharine
matter ordinarily present in condensed Milk and when diluted to the
resembles natural Milk more closely
proper extent
I Claim the use of gelose or other similar gelatinous material in the manufacture
of condensed Milk, substantially as herein before described.
In witness whereof I the said William Frost Sweetland have hereunto set
my hand and seal this fifteenth day of September One thousand eight
hundred and eighty two.
(L.S.) WF SWEETLAND.