Improvements in Pots for Boiling Milk, applicable to other analogous purposes.
Year: 1894

page_text: Date of Application, 8th Sept., 1894-Accepted, 13th Oct., 1894
COMPLETE SPECIFICATION.
Improvements in Pots for Boiling Milk, applicable to other analogous
purposes.
I, WILHELM PAUL MAX GOTTHEINER of 60 Gansemarkt, Hamburg, in the
Empire of Germany, 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 :-
The present invention relates to a pot particularly applicable for boiling milk in
which the milk cannot possibly get burned and the arrival at boiling point of the
milk is indicated by means of an automatic alarm and boiling over is prevented.
This invention is illustrated in the accompanying drawing in which :-
Fig. 1 is a perspective view and
Fig. 2 is a longitudiual vertical section.
b
The pot consists of a double walled vessel of which the interior a of the inner
wall serves for the reception of the milk to be boiled whilst the space between the
inner and outer walls serves to receive water. This water is poured in through the
inlet or filling tube c which is adapted to be closed by means of a screw plug or
stopper d.
At the upper part of the outer wall of the pot there is arranged a valve e which
acts as a safety valve and also as a signalling device.
To the pipef of the valve e there is soldered or otherwise suitably joined another
pipe 9 which serves as an alarm whistle. The weight which acts as a valve is
provided with a closed pipe i which fits into the pipe and closes the inlet opening
to the whistle pipe g under normal pressure.
In order to boil milk the operation is as follows:-
Water is poured through the filling pipe e into the space b. The pipe c is then
tightly closed by means of the screw plug d and the milk to be boiled is poured into
the space a and the pot is placed in or over any suitable source of heat for instance
upon the fire. The water in the space boils and the temperature of the boiling
water (which is under a low pressure) is transmitted to the milk and thus it is clear
that the milk is exposed to the action of heat which does not exceed the temperature
of water boiling under a low pressure.
In this manner neither burning nor boiling over of the milk can take place.
The steam from the chamber b raises the weight (acting as a valve) the
opening in the pipef is uncovered and the alarm whistle y is caused to sound by the
issuing steam and thus an alarm is given automatically before the milk has arrived
at boiling point.
A slide P is arranged on the whistle pipe adapted to be slid or placed over the
mouth piece of the whistle g for the purpose of enabling the whistling to be stopped
when once attention has been drawn to the approaching boiling up of the milk.
It will be obvious that materials or liquids other than milk may be boiled or
heated in a if desired either for alimentary or other purposes.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what I
claim is :-
1. A pot for boiling milk consisting of the combination of a double-walled vessel
forming two separate chambers the interior chamber surrounded at a distance ali
round by the outer chamber a pipe leading from the upper part of the annular space
formed between the said two vessels a weight valve provided with a guide spindl
normally adapted to close the said pipe and to be raised by the steam pressure and

page_text: thereby permit the escape of steam a whistle adapted to be sounded by such
escaping steam and thus indicate automatically the approaching boiling up of the
milk and a slide or cover to stop the whistle all substantially in the manner and for
the purposes herein before set forth.
2. The improved appliance arranged constructed combined and acting substan-
tially in the manner and for the purposes hereinbefore described and illustrated in
the drawings hereunto annexed.
Dated this 8th day of September 1894
TONGUE & BIRKBECK,
34, Southampton Buildings, Chancery Lane, London, W.C.,
Agents for the Applicant.