Improvements in or relating to the Preparation of Condensed Cream.
Year: 1890

page_text: Date of Application, 14th July, 1890-Accepted, 30th Aug.. 1890
COMPLETE SPECIFICATION.
Improvements in or relating to the Preparation of Condensed
Cream.
I, MATHILDA PERSSON, Manufacturer, of Malmo, Sweden, do hereby declare the nature
of this invention and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement :-
This invention relates to a manner and an apparatus for preparing so called con-
densed cream, i.e. for preparation of cream which by suitable additions and subsequent
boiling acquires the power of keeping without spoiling, or even getting the slightest
after-taste, for a period of a few days to a time of several months during even the
hottest months of the year.
The manner in which this is accomplished is by adding sugar, salicylic acid and
eventually sweet milk and maizena and afterwards boiling the mixture while evenly
stirring it.
The proportion of the ingredients of the mixture as well as the richness of the cream
and time of boiling depends on the degree of durability desired.
Cream destined to be kept a long time e.g. for some months, has been found most
suitable when of a richness of 12 per cent. and the proportions of the ingredients
added to be 1 gr. of salicylic acid and 10 gr. of sugar to every litre cream of
that richness. This mixture so as to be steadily boiled while being constantly
stirred, is placed in a suitable vessel and after boiling away until about 60 per cent. of
the mixture remains is let off and while still hot is at once poured into the bottles
or jars intended for the cream, which are carefully closed after which the air that
may remain in the bottles is driven out by putting the bottles in water which is
brought to boil.
If only a shorter time of keeping is desired, the mixture is allowed to cool after
being condensed and is then poured into the jars.
Another proportion for the ingredients added, which gives a cream that keeps but a
few days is; 3 litres of cream of a richness of 12 per cent., 6 litres of sweet milk,
4 gr. of sugar, 3 gr. of salicylic acid and 20 gr. of maizena, the mixture being treated
in the same manner as already described.
Several other proportions have been tried and used by the inventor but those above
mentioned may be considered as typical of the rest. the treatment of the mixture
being in most cases the same. The apparatus in which the mixture is boiled and
stirred is represented in the accompanying drawing where Fig. 1 is a vertical section
and Fig. 2 a plan of the apparatus.
The apparatus consists of two concentric vessels one inner one a and one outer
one b, made of suitable material, the former being intended for containing the cream
had better be of tinned copper, the latter being simply for water may be of iron.
The outer vessel is placed above a fire place c so as to boil the water contained
therein by which the cream-mixture contained in the inner vessel is brought to a
stendy boil.
The two vessels are furnished with a common lid d which closely fitting rests
on the edge of the walls of the vessels and provided with a valve e for letting
off the steam of the cream mixture during the process of boiling. In the inner
vessel a a vertical shaft is placed which by arms 9 proceeding therefrom supports
a brush of suitable material for whipping or stirring the mixture while boiling.
The brush or whipper his revolved by a hand or other crank or power i and
gearing k. From the inner vessel a pipe passes through the outer vessel to
beyond the apparatus and is there provided with a cock so as to lead off the cream
that is ready. The pipe m leading to the other vessel is provided with a funnel, a
manometer and a safety valve. The lid of the vessels is secured by eccentrics or in
any other suitable manner and may be ifted by means of a counterpoise n.

page_text: Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is ;-
1. The method of preparing so called condensed cream that will keep by adding
one or more of the ingredients milk sugar salicylic acid or maizena and afterwards
steadily boiling in a suitable vessel the mixture being kept stirred or whipped con-
tinuously until about 60 per cent. remains substantially as described.
2. For the method of preparing cream mentioned in claim 1, and in combination
with a suitable fireplace an apparatus consisting of two concentric vessels provided
with a common lid the inner vessel intended for the cream nixture being provided with
an outlet pipe steam valve and one or more rotating brushes fixed to a vertical
sbaft connected to any suitable device for rotation and the outer vessel destined to hold
the water necessary to bring the cream to a boil being in direct communication
with the fire substantially as described and illustrated in the accompanying drawings.
Dated this 14th day of July 1890
W. P. THOMPSON & BOULT,
Agents for the Applicant.