Year: 1896

page_text: We, STEPHEN WINCKWORTH SILVER, Gentleman, and WALTER FLETCHER, Gun
Smith, both of 67 Cornhill, London, do hereby declare the nature of this invention to
be as follows:-
This invention relates to certain improvements in or connected with pocket
filters.
For the purpose of our invention, we construct a pocket filter from a combination
of box with perforated bottom, a screw in partition between which is the filtering
medium preferably a solid porous body with an internal tube terminating in an
outside nipple fitting within a nipple on the upper surface of the partition for the
attachment of an india rubber tube with mouthpiece.
There is a space between the partition and an outside lid for receiving the india
rubber tube when curled up to make the article compact when out of use.
The internal tube may be part of the partition and be perforated for part of its
length.
We prefer a solid moulded block of porous stone, such as sandstone, or of a
composition but loose material can be employed for the purpose and may be enclosed
in a flannel or other bag.
H. GARDNER,
Patent Agent, 166 Fleet Street, London,
Agent for the said Stephen Winckworth Silver and Walter Fletcher.
We, STEPHEN WINCKWORTH SILVER, Gentleman, and WALTER FLETCHER, Gun
Smith, both of 67 Cornhill, London, 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 certain improvements in or connected with pocket or
portable filters.
For the purpose of our invention and as we show on the annexed drawings,
Figure 1 sectional elevation of a filter with a single draw tube, and Figure 2 detached
view of the porous block with a series of tubes terminating to a single mouthpiece,
we construct a pocket or portable filter, Figure 1 in section, from a combination of
box A with perforated bottom B, a screw in partition C between which is the filtering
medium D preferably a solid porous body (say sand stone), this having one or more
channels for receiving a tube E, say of bone, or a series of such tubes terminating
in an outside nipple F for the attachment of an india rubber tube G with
mouthpiece H.

page_text: A space is left between the partition C and an outside lid I for receiving the india
rubber tube G when curled up to make the article compact when out of use.
The internal tube E may be part of the partition C and be perforated for part of its
length.
We prefer a solidly prepared or moulded block of porous stone, such as sand stone,
or of a composition, but loose material can be employed for the purpose and may be
enclosed in a flannel or other bag.
The screw down partition C may compress any suitable loose material, such as sand,
linen, charcoal granulated or mixture of materials.
The stone used is of such a character that it may be taken out and boiled to sterilize
it after frequent use.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
The apparatus shown at Figure 1 of the annexed drawings, as a pocket or portable
filter in which an inwardly screw down partition C with a depending tube E (or
tubes) is inserted in a hole (or holes) in a porous block D, or its equivalent, the
box A being so arranged or shaped that the flexible draught tube G can be curled
singly between the partition C and the lid I, as and for the purpose or purposes
described.
1.
H. GARDNER,
Patent Agent, 166 Fleet Street, London,
Agent for the said Stephen Winckworth Silver and Walter Fletcher.