Year: 1886

page_text: Date of Application, 16th Apr., 1886.
Complete Left, 14th Jan., 1887.
Complete Accepted, 15th Feb., 1887.
I, CHARLES EDWARD GITTINS of 113 Iverson Road West Hampstead in the County
of Middlesex Clerk do hereby declare the nature of this invention to be as follows:-
My improved filter consists simply of two bowl like vessels the mouths of which
are covered with perforated metal. In the bottom of each vessel is a hole with a
screw thread within it suitable to screw on to a supply nozzle or other suitable
couplings may be provided. The two vessels fit together mouth to mouth and between
them a filtering fabric is placed; it is tightly nipped round the edges by screws which
draw the lips of the vessels together and form a tight joint. A filter bed may be
formed on the surface of the filtering fabric by introducing a suitable finely divided
material mixed with water into the interior of the filter before screwing it on to the
supply pipe or nozzle. The material so introduced coats the fabric with a thin layer
of fine filtering material. Coarser material may also be put in to assist the fine
medium. The filter bed when spent may be washed away by reversing the filter so as
to bring the filter bed on to the side opposite to the supply.
Pocket filters may be made in a similar way in this case the water is drawn
through the filter by suction applied at a flexible pipe provided for the purpose.
Suitable arrangement is made to prevent the water leaking out of the filter when
put away. A stop is also provided in the flexible tube to prevent the water running
back when the suction is withdrawn.
CARPMAEL & Co.,
Agents for the Applicant.

page_text: Improvements in Filters.
I CHARLES EDWARD GITTINS of 113 Iverson Road West Hampstead in the County
of Middlesex Clerk do hereby declare the nature of this invention and in whai
manner the same is to be performed to be particularly described and ascertained in
and by the following statement :-
My improved filter consists simply of two bowl like vessels the mouths of which
are covered with perforated metal. In the bottom of each vessel is a hole with a
screw thread within it suitable to screw on to a supply nozzle or other suitable
couplings may be provided. The two vessels fit together mouth to month and between
them a filtering fabric is placed; it is tightly nipped round the edges by screws which
draw the lips of the vessels together and form a tight joint. A filter bed may be
formed on the surface of the filtering fabric by introducing a suitable finely divided
material mixed with water into the interior of the filter before screwing it on to the
supply pipe or nozzle. The material so introduced coats the fabric with a thin layer
of fine filtering material. Coarser material may also be put in to assist the fine
medium. The filter bed when spent may be washed away by reversing the filter so as
to bring the filter bed on to the side opposite to the supply.
Pocket filters may be made in a similar way; in this case the water is drawn
through the filter by suction applied at a flexible pipe provided for the purpose.
Suitable arrangement is made to prevent the water leaking out of the filter when
put away. A stop is also provided in the flexible tube to prevent the water running
back when the suction is withdrawn.
In order that, my said invention may be fully understood and readily carried into
effect I will proceed to describe the drawings hereunto annexed.
DESCRIPTION OF THE DRAWINGS.
Figure 1 is a vertical section and Figure 2 is a plan of a filter constructed according
to my invention.
Figures 3 and 4 show a similar filter but modified in some of its details.
Figure 5 is an elevation of a pocket filter made in accordance with my invention.
Figure 6 is a transverse section and
Figure 7 is a plan of the same.
Figure 8 shows a spring clip used to close the suction pipe of the pocket filter.
In Figures 1 and 2 A and B are bowl like vessels, each has an aperture in the
centre and a screw thread is cut within the aperture. The water supply tap to which
the filter is applied has a corresponding thread and the filter can be screwed on to
the tap either side up. The paris A and B are held together by tap screws C and
between the two the compound diaphragm D is nipped by its edges. This porous

page_text: diaphragm D preferably consists of two finely perforated metal discs d'd¹ holding
between them a piece of asbestos fabric d³.
In preparing the filter for use the upper part over the diaphragm is preferably filled
with finely granulated charcoal; the filter is then screwed on to the tap and it is ready
for use.
When the filter requires cleansing it is removed from the tap and screwed on again
the other way up-the water is turned on and the granulated charcoal is washed
away. Fresh charcoal is then supplied and the filter is again screwed on to the tap.
In figures 3 and 4 the arrangement is similar except that the parts A and B screw
together and tap screws are dispensed with.
The portable filter shown by the Figures 5, 6 and 7 also consists of two vessels
A and B screwed together and nipping a diaphragm D between them. The diaphragm
here represented is of porous earthenware or sand stone. The central apertures in
the parts A and B are small and pass through nozzles a¹ and b¹. The nozzle a¹ on the
part A is adapted to be placed in the mouth and by the suction of the mouth the water
is drawn through the filter. E is a screw plug which serves to close the nozzle a¹
when the filter is out of use. The nozzle 6 receives upon it the flexible india rubber
suction tube F which at its further end is armed with the perforated metal rose G.
This rose is immersed when the filter is in use, in the water which is to be drawn up
into the mouth through the filter and the suction tube F.
When the pocket filter is out of use its suction tube is closed by applying to it the
clip H. The space beneath the diaphragm D is preferably charged with finely
granulated carbon.
Having now particularly described and ascertained the nature of my said invention,
and in what manner the same is to be employed I declare that what I claim is :-
1. A filter consisting of the parts A and B adapted to be screwed upon a supply
tap and clipping between them the porous diaphragm D substantially as described.
2. A pocket filter consisting of the parts A and B with nozzles, diaphragm, suction
pipe and rose substantially as described.
3. In combination with the filters defined by the preceding claiming clauses, the
layer of finely divided filtering material resting against the diaphragm substantially
as described.
CARPMAEL & Co.,
Agents for the Applicant.