IMPROVEMENTS CONNECTED WITH FILTERS FOR WATER AND OTHER LIQUIDS
Year: 1884

page_text: I, FREDERIC GROSVENOR, of Eagle Pottery, 60 Boden Street, Glasgow, in the
county of Lanark, Potter, do hereby declare the nature of my said Invention for
"IMPROVEMENTS CONNECTED WITH FILTERS FOR WATER AND OTHER LIQUIDS," to
be as follows:-
This Invention has reference to a special new or improved construction, or
combination of materials for, and mode of constructing the hollow compressed
charcoal or carbon blocks used for such filters.
The improvements, or nature and novelty of the Invention, consist in forming
the internal or intermediate body part of these hollow blocks with finely ground
or pulverised animal charcoal, enclosed in an outer and inner surface thickness or
layer of a mixture of finely ground coke or wood charcoal, or other equivalent
porous carbonaceous material, with a small proportion of tar, pitch, rosin, or other
oleaginous matter, so that when the whole block, so formed and compressed, is
baked in an oven at a red heat for some hours and taken out and cooled, this outer
and inner shell or case would form a hard porous filtering crust, containing and
supporting the internal and more friable filtering animal charcoal, all as a solid
filtering block to be used in these filters in place of the homogeneous carbon blocks
heretofore used.

page_text: I, FREDERIC GROSVENOR, of Eagle Pottery, 60 Boden Street, Glasgow, in the
county of Lanark, Potter, do hereby declare the nature of my said Invention for
"IMPROVEMENTS CONNECTED WITH FILTERS FOR WATER AND OTHER LIQUIDS," and
in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement :-
This Invention consists in forming the internal or intermediate body part of
hollow filter blocks with finely ground or pulverised animal charcoal or bone black
enclosed in an outer and inner surface thickness or crust of carbon. The carbon
crust may be formed by mixing finely ground coke or wood charcoal, or other
carbonaceous material, with a small proportion of tar pitch, rosin or other oleaginous
inatter, and baking the same in an oven at a red heat for some hours. When taken
out and cooled, this outer and inner shell or case forms a hard porous filtering crust
which serves to contain and support the internal filtering medium of animal
charcoal which is filled in before baking the crust, so that the whole forms a solid
filtering block to replace the homogenous carbon blocks heretofore used.
The form of the composite filter block is represented in section in the accom-
panying drawing, in which A, A¹ is the retaining carbon crust, and. B the internal
filling of powdered animal char. A cap C of earthenware or other substance
provided with an opening c may be cemented to the block to serve as an outlet for
the water, or other liquid to be filtered, which enters the block through the crust
and percolates through the animal char and through the inner crust, and escapes
by the opening c.
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
1 claim is,
A composite filter block consisting of an outer and inner crust or shell of carbon
enclosing a filling of animal charcoal, substantially as described.
Dated this Sixth day of October 1884.
FREDERIC GROSVENOR.