AN IMPROVED FILTER to be as follows:
Year: 1884

page_text: I, ALEXANDER MELVILLE CLARK, of the firm of A. M. and Wm. Clark, of 53,
Chancery Lane, in the County of Middlesex, Fellow of the Institute of Patent
Agents, do hereby declare the nature of the said Invention for "AN IMPROVED
FILTER to be as follows:-
"
It has been found by experience and analysis that the filtration of water by
the apparatus now in use is but very imperfectly performed and that the water
always retains a certain quantity of noxious germs and organisms which it is of
essential importance should be eliminated. The improved filtering apparatus of
this Invention is intended to remedy the above objections and ensure the perfect
filtration of the water and the elimination from it of all traces of germs or
impurities.
The apparatus is of very simple construction is readily portable may be directly
connected to a water tap and will act with or without a pressure of water.
The Invention is illustrated by way of example in the accompanying Drawing
which shows a filter composed of a vessel a closed at top and provided with a
nozzle 6 for attaching a flexible pipe, or for direct connection with the supply
pipe. The vessel is closed at bottom by a .cap e screwing on the lower end of the
sides a the plate c being also provided with a nozzle & which is continued up to a
convenient height inside of the filtering vessel.
The filter proper consists of an inverted cup or bell vessel e of porous terra
cotta which is capable of being refired without affecting its porous character.
This porous belle is simply placed mouth downwards on the bottom o and luted
around its edge by means of wax or other suitable material. f is a screw cap
closing a cleaning bole. The porous filtering bell shaped diaphragm of this
Invention possesses two distinguishing features.
1st It is made of cylindrical or conical form and affords a large filtering surface,
within a comparatively small space.

page_text: 2nd The nature of the filtering medium employed is such that it can be cleaned
by being refired as often as necessary, and will thus last for an indefinite time.
The filter can be readily taken to pieces by simply unscrewing the bottom cover a
and warming it to melt the wax by which the filtering diaphragm is fixed in
place.
The apparatus would be made of a form and dimension suited to the purpose
to which it is to be applied, and where intended to be portable, porous vessels
would be used such as those now sold for electrical batteries, a circumstance which
contributes to the economical manufacture of these improved filters.
Dated this 22nd day of March 1884.

page_text: I, ALEXANDER MELVILLE CLARK, of the firm of A. M. and Wm. Clark, of 53,
Chancery Lane, in the County of Middlesex, Fellow of the Institute of Patent
Agents, do hereby declare the nature of the said Invention for "AN IMPROVED
FILTER" and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement:-
It has been found by experience and analysis that the filtration of water by
the apparatus now in use is bub very imperfectly performed and that the water
always retains a certain quantity of noxious germs and organisms which it is of
essential importance should be eliminated. The improved filtering apparatus of
this Invention is intended to remedy the above objections, and ensure the perfect
filtration of the water and the elimination from it of all traces of germs or
impurities.
The apparatus is of very simple construction, is readily portable, may be directly
connected to a water tap, and will act with or without a pressure of water.
The Invention is illustrated by way of example in the accompanying Drawing
Figures 1 and 2 of which show two forms of the improved filter in longitudinal
section, differing from each other only in detail and both possessing the same
essential features. In Figure 1 the filter is composed of a vessel a closed at top
and provided with a nozzle b for attaching a flexible pipe, or for direct connection
with the supply pipe. The vessel is closed at bottom by a cap c scrowing on the
lower end of the sides a, the cap c being also provided with a nozzle d which is
continued up to a convenient height inside of the filtering vessel.
The filter proper consists of an inverted cup or bell vessel e of porous earthen-
ware which is capable of being refired without affecting its porous character.
This porous belle is simply placed mouth downwards on the bottom c and Inted
around its edge by means of wax or other suitable material. f is a screw cap
closing a cleaning hole.
The filter can be readily taken to pieces by simply unscrewing the bottom
cover c and warming it to melt the wax by which the filtering diaphragm is
fixed in place.
The modified arrangement of the filtering diaphragm represented in Figure 2
is designed to ensure with absolute certainty the filtration of the whole of the
water drawn off, the diaphragm itself forming the outlet.
The apparatus as shown in Figure 2 consists of an outer tube or cylinder a
branched at one end on to a cock c, on the end of a pipe band of a tubular
filtering diaphragm d closed at the inner end and secured by its outer end (which
forms the delivery nozzle) in the outer end of the cylinder a in the following way.
A flauge e of porcelain or other similar material is cemented by enamel on to this
end of the tube d and the tube d, being inserted through the central aperture f
) in the bottom h of cylinder a, the flange e is secured against the bottom flango h
(with a washer of india rubber g applied between) by tightening up the screw
cap through which protrudes the contracted end or nozzle j of the filtering tube
or diaphragm d.
The porous filtering diaphragm of this Invention possesses two distinguishing
5 features. 1 It is made of cylindrical or conical form and affords a large filtering
surface within a comparatively small space. 2 The nature of the filtering
medium employed is such that it can be cleaned by being refired as often as
necessary, and will thus last for an indefinite time,

page_text: The apparatus would be made of a form or dimensions suited to the purpose to
which it is to be applied and where intended to be portable, porous vessels would
be used such as those now sold for electrical batteries, a circumstance which
contributes to the economical manufacturo of these improved filters.
A number of these filters may be connected to the same supply pipe if desired.
Having now particularly described and ascertained the nature of the said
Invention and in what manner the same is to be performed I declare that what
I claim is
1 The improved construction of filter herein described in which the filtering
medium is constituted by a cylindrical or conical diaphragm of porous earthenware,
which is capable of being refired without affecting its porosity.
2nd The particular. constructions of filter shown in the Drawings, and more
particularly the combination of the filter proper d furnished with a flange e and
nozzlo j, with the elastic washer g and screw cap i for the purpose of securing it
watertight in the outer vessel substantially as shown and described.