Year: 1887

page_text: Date of Application, 24th Aug., 1887
Complete Left, 24th May, 1888
Complete Accepted, 29th June, 1888
We STEPHEN WINCKWORTH SILVER of Sun Court, Cornhill, London, Manufacturer
and WILLIAM STEPHEN BENNETT of the same place, Salesman, do hereby declare the
nature of this invention to be as follows:-
The object of this invention is to construct a pocket filter in a novel manner so that
when not in use the article is shut up in a compact form for carrying in the pocket or
for stowage with wearing apparel or otherwise, the suction tube being arranged or
coiled on the filter block and enclosed by a screw cover-which only requires
unscrewing and the tube drawn out to set the filter in use.
The article is composed of a box, say, of ebonite, with a perforated base. The inner
surface of the base is covered with a disc of felt, flannel or other spongy absorbent
body, on to which a block of charcoal or other filtering agent is put into contact, said
block having another disc of felt or the like on the top. This latter disc has a hole in
its centre for the block nozzle to project through to enable the suction tube to be
attached.
The charcoal block fits the interior of the box and a screw cover is so made that it
can rest upon the top flannel, this cover occupying a position below the top edge of
the box as to leave room for receiving the suction tube when coiled, this being retained
in that condition by an outsido cover.
The inner cover is perforated so that, when the filter is in use water has access to
the block both from the top and from the bottom.
H GARDNER,
166, Fleet Street, London,
Agent for the said S. W. Silver and
W. S. Bennett.

page_text: We STEPHEN WINCKWORTH SILVER of Sun Court, Cornhill, London Manufacturer
and WILLIAM STEPHEN BENNETT of the same place, Salesman 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 :-
The object of this invention is to construct a pocket filter in a novel manner so that
when not in use the article is shut up in a compact form for carrying in the pocket or
for stowage with wearing apparel or otherwise, the suction tube being arranged or
coiled on the filter block and enclosed by a screw cover, which only requires unscrewing
and the tube drawn out to set the filter in use.
The article is composed of a box, say, of ebonite with a perforated base. The inner
surface of the base is covered with a disc of felt, flannel, carbon or other spongy
absorbent body, on to which a block of charcoal or other filtering agent is put into contact,
said block having another disc of felt or the like on the top. These two discs of felt
or sheet carbon play an important part in keeping the charcoal block clean and as they
are readily removable, fresh ones can be fitted in position with facility. The top disc
has a hole in its centre for the block nozzle to project through to enable the suction
tube to be attached.
The charcoal block fits the interior of the box and a screw cover is so made that
it can rest upon the top flannel, this cover occupying a position below the top edge of
the box so as to leave room for receiving the suction tube when coiled, this being
retained in that condition by an outside cover.
The inner cover is perforated so that when the filter is in use water has access to
the block both from the top and from the bottom.
The invention will be understood by the annexed drawings.
Figure 1 is a perspective view of the box A with the contents removed, showing
the perforations in the bottom.
Figure 2 is a perspective view of the interior fittings to go into said box A.
Figure 3 is a top perspective view of the cover.
Figure 4 is a sectional elevation of the box complete.
B is the carbon or filtering block which fits the block A and rests upon a flannel or
absorbent body as seen more particularly in Figure 4.
C is a screw cover also perforated to rest upon the top layer or disc of felt D when
screwed home the cover having two buttons E. E. to enable it to be turned, said
cover C engaging in the screw threads F within the box A.
The charcoal or other filtering block B has a central hollow plug G, to a projecting
nozzle of which one end of a Hexible tube H is stretched over, said tube passing
through the disc D and cover C so that it can when not in use be coiled on the top
of the cover C and lodged within the space between that and the cover I which screws
upon the exterior of the box as indicated by the section.

page_text: We prefer to screw thread the outside of the cover 1 for the attachment of an
outside cover J the space formed between I and J serving for extra discs of carbon,
flannel or felt should such be required.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
1. The improved construction and arrangement of pocket filter as hereinbefore
described and substantially as shown in the annexed drawings.
2. Making a pocket filter box with a perforated base, a charcoal or other filtering
block held in position by a screw threaded disc also perforated, substantially as
described with reference to Figure 4 of the annexed drawings.
H. GARDNER,
166, Fleet Street, London,
Agent for the said S. W. Silver, and
W. S. Bennett.