An Improved Device for Filtering Water.
Year: 1893

page_text: Date of Application, 27th Oct., 1893
Complete Specification Left, 25th Aug., 1894-Accepted, 29th Sept., 1894
PROVISIONAL SPECIFICATION.
An Improved Device for Filtering Water.
SIDNEY WITTMANN 47, Great Marlborough Street W. Middlesex, Glass and
China Merchant and Manufacturer, do hereby declare the nature of this invention
to be as follows:-
My invention consists in the employment of hollow-preferably egg shape-
charcoal bodies, vases, vessels or other receptacles as a means of filtering water.
I produce these by mixing ground charcoal by preference with white starch &
then mould it in clay moulds of the shape required in which it is then submitted to
the action of fire in a kiln in order to give the articles required the necessary
consistency and hardness whilst retaining their porosity.
When finished these vases or vessels are fixed or placed inside any suitable jug,
urn, vase or other body. They are then filled with water, which percolates through
the charcoal into the space beneath from which it is drawn off by means of a tap or
poured out from the top.
Dated this 23rd day of October 1893.
COMPLETE SPECIFICATION.
An Improved Device for Filtering Water.
I, SIDNEY WITTMANN, 47 Great Marlborough Street, W., Middlesex, Glass
and China Merchant and Manufacturer, 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 :-
My invention consists in the employment of hollow, preferably egg shape,
charcoal bodies, vases, vessels or other receptacles as a means of filtering water.
When finished these vases or vessels are fixed or placed inside any suitable jug,
urn, vase or other body. They are then filled with water, which percolates through
the charcoal into the space beneath from which it is drawn off by means of a tap or
poured out from the top.
The drawing shows one of my filters. A is a receptacle of charcoal as aforesaid,
preferably made in the manner hereinafter described, B is a vessel of earthenware
or other material supporting the receptacle A, a space however being left between
them so that free filtratiou takes place over the whole surface of A. C is a cock
for drawing off the filtered liquid and D is a cover.
The vessel B may be of any
shape or material.
I prefer to make the receptacle A of a mixture of
50 per cent. spodium (animal charcoal),
40
"
"
clay,
10
"
ground coke or lignite,
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but these proportions may be varied according to the porosity desired. Starch
or sawdust may be substituted for the coke.
This mixture is moulded to a form in a hydraulic or other press; but I also
fashion it on a potter's wheel. The vessel is then fired at a high temperature in a
kiln whilst protected from the air.

page_text: 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 filter in which the filtration takes place from the interior of a charcoal
Ivessel to the exterior.
2. The vessel A substantially as described.
3. Filters substantially as described and shown in the drawing.
....
ليمي
1
1904
SIDNEY WITTMANN.