Improvements in Apparatus for Boiling or Sterilizing Milk and other Liquids.
Year: 1890

page_text: COMPLETE SPECIFICATION.
Improvements in Apparatus for Boiling or Sterilizing Milk and
other Liquids.
I, JAQUES OETTLI of Lausanne, Switzerland, Professor of Chemistry, do hereby
declare the nature of this invention and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement :-
:―
My invention relates to improvements in apparatus for boiling or sterilizing milk,
and other liquids which on account of their thickness, froth or foam, boil over the
vessels in which they are ordinarily boiled.
The prolonged boiling of such liquids has for object to concentrate them and in the
case of milk to destroy the organisms of vegetable or animal origin which set up
changes therein or have an evil influence upon the health of the consumers thereof,
such deleterious or noxious organism being eliminated by decomposition or simply by
evaporation.
The apparatus consists of a vessel of cylindrical or other suitable form made of any
material capable of withstanding heat and the dissolving action of the liquids treated
therein, the thickness of the bottom of this vessel being sufficient to prevent the
flame, if too intense, or if playing upon a small surface, from burning the
liquid.
The liquid may be heated directly by a bare fire or by means of a water bath or by
steam passing either inside or outside the vessel or in any other suitable
manner.
In order that my invention may be more fully understood I have shewn the same
in the accompanying drawings in which
Fig. 1 is a sectional elevation and Fig. 2 a plan of my improved apparatus.
In order to promote a double and regular current of the liquid under treatment 1
arrange in the outer vessel A an inner receptacle consisting of two parts, viz. of a
truncated cone B the smaller base of which rests upon the bottom of the outer vessel,
and of an upper cylindrical part C forming the prolongation of the large base
of the truncated cone. Should the outer vessel bave any other shape, the inner
vessel must have a corresponding form.
There is formed between the inner and outer vessel an annular space in which the
liquid ascends and as the latter reaches the upper edge of the inner vessel, it enters
therein and passes afterwards through slots S formed in its lower part into the outer
vessel and so on continuously.
It is well known that by virtue of the adherence of air upon the walls of a vessel
a liquid will boil more rapidly, more energetically, and for à longer time, along the
sides and at the bottom of the said vessel than in any other part, and that consequently
it is in accordance with a physical law that it is sought according to this invention to
create an outward ascending current in preference to a current in the midst of the
liquid.
My improved apparatus may be made of any suitable size, while the inner receptacle
is fixed to the outer vessel by means of radial rods or bars 6 b¹ 62 63 which do not
interfere with the ascent of the liquid.
Having now particularly described and ascertained the nature of my said Inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
The improved apparatus for boiling and sterilizing milk or other liquids in which

page_text: the milk is prevented from boiling over owing to the formation therein of an
ascending and descending current due to the peculiar construction of such apparatus
substantially as and for the purpose described."
Dated this 21st day of April 1890.
RAYNER & CASSELL,
37, Chancery Lane, London, Agents for the Applicant.