Year: 1888

page_text: 1 BENJAMIN NICKELS, Junior, of 150 Holborn E.C. in the City of London
Chemical Engineer 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 improvements in filtering funnels of the character described
in the specification of Letters Patent granted to Wallace Christopher Nickels dated
25th June 1886 No. 8375 in which a double funnel is employed the inner funnel
being perforated with holes.
Now I find that in filtering many liquids it is desirable that the filtration should
take place while the liquids are warm or hot this is particularly the case with soups,
jellies, syrups, fatty liquids, coal tar, and many other fluid products which have to be
filtered.
It is a difficult matter to regulate the temperature with any degree of accuracy and
when on a large scale the filter must be placed in a hot room and in a laboratory it
must be placed in a hot air or water bath.
か
By making double funnel filters of this character with a fixed outer jacket and
covering the top of the funnel with a moveable cover, (to receive hot water or other
heating or cooling medium if desired), the temperature of the liquid to be filtered
can be regulated very perfectly.
In like manner when filtering volatile liquids, such as bisulphide of carbon, ether,
alcohol petroleum, benzole and such like in a warm room it is very desirable that such
liquids should be kept cold to avoid loss from evaporation, and my improvements are
advantageously adapted for this purpose.
And in order that my invention may be clearly understood and readily carried into
practice I will proceed to describe the drawing hereto annexed which shows a vertical
section of a filtering funnel arranged and constructed in accordance with my
improvements.
a. a. is the inner perforated funnel and b. b. the casing which surrounds it as in the
specification before referred to c. c. is an outer jacket soldered cemented or otherwise
joined to the outer cylinder or casing b. of the funnel.

page_text: d. is a collar also fixed to the outer funnel as above described, e being a movable lid
fitting over the collar d.
f. is a tube for inserting a thermometer to ascertain the temperature in the outer
jacket c.
g. is the inlet tube to outer jacket c. which tube may be connected with a supply of
either hot or cold water, steam, or by means of a double tube to either hot or
cold water, or cold water and steam, admission being regulated by a stopcock or
otherwise.
h. is the outlet tube for allowing condensed or other water or steam to escape which
may be regulated by a stopcock or otherwise. The jacket c. may be suitably arranged
to receive ice if desired.
By the above description it will be seen that the temperature at which the liquid is
to be filtered can be regulated accurately without the liquid itself coming into contact
with a direct heating agency.
The cooling process is a most important consideration when filtering delicate scents
and the application of heat when filtering pommades fats and such like fluids.
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. The improved arrangement and application to filtering funnels of an outer
jacket and cover to contain a heating or cooling medium and thermometer in order to
ascertain and maintain the temperature of the liquid to be filtered substantially in the
manner and for the purpose herein fully described and illustrated by the drawing
hereto annexed.
2. The improved arrangement and construction of double fiitering funnels substan-
tially as and for the purpose hereinbefore described and shown in the drawing
annexed.