IMPROVE- MENTS IN FILTERS."
Year: 1853

page_text: LETTERS PATENT to Thomas Russ Nash, of Leigh Street, in the
County of Middlesex, Surveyor, for the Invention of "IMPROVE-
MENTS IN FILTERS."
PROVISIONAL SPECIFICATION left by the said Thomas Russ Nash
at the Office of the Commissioners of Patents, with his Petition,
on the 4th June 1853.
I, THOMAS RUSS NASH, of Leigh Street, in the County of Middlesex,
Surveyor, do hereby declare the nature of the said Invention for
"IMPROVEMENTS IN FILTERS" to be as follows:-
My filter is intended to be applied between some source of supply
and discharge for water. It consists of a finely perforated conical tube
or sheet of wire gauze made into the shape of a conical tube, the base
of the cone being applied to that part of the filter into which the supply
of water enters; the apex of the conical tube enters into the discharge
pipe. Outside of the conical tube I place a cylindrical tube with very
much coarser perforations, and surround it with flannel, linen, or other
like filtering medium, and enclose the whole in an outer casing provided
with a pipe and tap for drawing off the filtered water. The action is as

page_text: follows: On the tap attached to the discharge or draw-off pipe for
unfiltered water being turned the water rushes from the cistern or other
source of supply into the larger end of the conical tube, through it, and
into the draw-off pipe. But the water to be drawn off clear and
filtered percolates the conical tube, leaves therein the grosser matters
with which the water may be impregnated, passes through the cylin-
drical perforated tube and flannel, or other filtering medium surrounding
it, and is drawn off from the pipe connected to the outer casing. The
check the unfiltered water receives on shutting off the discharge cock
creates a disturbance in the foul water which loosens the deposit on
the conical tube, and on the foul water tap being again opened these
deposits will be drawn off through it.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Thomas Russ Nash in the Great Seal Patent
Office, on the 3rd December 1853.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I,
THOMAS RUSS NASU, of Leigh Street, in the County of Middlesex.
Surveyor, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Fourth day of Junc, in the year of
our Lord One thousand eight hundred and fifty-three, in the sixteenth
year of Her reign, did, for Herself, Her heirs and successors, give and
grant unto me, the said Thomas Russ Nash, Her special licence that I.
the said Thomas Russ Nash, my executors, administrators, and assigns,
or such others as I, the said Thomas Russ Nash, my executors, admi-
nistrators, and assigns, should at any time agree with, and no others,
from time to time and at all times thereafter during the term therein
expressed, should and lawfully might make, use, exercise, and vend,
within the United Kingdom of Great Britain and Ireland, the Channel
Islands, and Isle of Man, an Invention for "IMPROVEMENTS IN FILTERS,'
upon the condition (amongst others) that I, the said Thomas Russ
Nash, by an instrument in writing under my hand and seal, should
particularly describe and ascertain the nature of the said Invention,
and in what manner the same was to be performed, and cause the same

page_text: to be filed in the Great Seal Patent Office within six calendar months
next and immediately after the date of the said Letters Patent.
NOW KNOW YE, that I, the said Thomas Russ Nash, do hereby
declare the nature of my said Invention, and in what manner the same
is to be performed, to be particularly described and ascertained in and
by the following statement thereof, reference being had to the Drawings
hereunto annexed, that is to say:
My Invention relates to tubular filters, and consists in improvements
upon a "self-cleansing tubular filter," for which one William Murray
obtained protection under the Designs Registration Act the Eighth day
of April, One thousand eight hundred and fifty.
These improvements are,-First, the addition to tubular filters of a
finely perforated conical tube, or of a sheet of wire gauze formed into
the shape of a conical tube; and,
Second, a means of readily fastening and unfastening the parts of the
barrel in which such filters may be placed.
Figure 1, of the Drawings hereunto annexed represents an exterior
elevation, and Figure 2, a longitudinal section of a tubular filter, con-
structed according to my improvements, and inserted in an outer barrel.
A, A, is the exterior barrel or casing, which is divided in the centre, but
connected together by flanges and screws B, B; C, is the supply, and D,
the discharge pipe, which are connected to the casing A, by the union
joints E, E, F, FF, are socket pieces fitted into the interior ends of the
casing; G, is the conical tube of fine gauze, which is secured in the centre
of the casing by the base or end a, being slightly turned over the piece
F, the other end a, of the conical tube being supported centrally by three
pieces of metal b, b, soldered on or otherwise fixed to the tube. H, is a
cylindrical tube which surrounds the conical tube, and is pierced with
much coarser perforations. This tube is fitted into sockets c, c, formed in
the picces F, F, whereby it is retained in its position. I, I, is a roll
formed of several thicknesses of flannel, linen, or other suitable filtering
medium attached at the ends to the pieces F, F', as shewn in Fig. 2.
K, is a tap for drawing off the filtered liquid which is contained in the
space between the exterior of the filtering cylinder and the interior of
the casing, A, A; and L, is a tap upon the discharge or draw-off pipe
for unfiltered liquid. The action of the filter is as follows:-On the

page_text: tap L, on the discharge pipe being turned the water (supposing that
to be the liquid to be filtered) rushes from the cistern or other source
of supply into the larger end of the conical tube, through it, and into
the draw-off pipe. But the water to be drawn off clear and filtered
percolates the conical tube, leaves therein the grosser matters with
which the water may be impregnated, passes through the cylindrical
perforated tube H, and roll of flannel or other filtering medium
surrounding it, and is drawn off from the tap K, connected to the outer
casing. The check the unfiltered water receives on shutting off the dis-
charge tap L, creates a disturbance in the foul water, which loosens the
deposit on the conical tube, and on the foul water tap being again
opened this deposit will be drawn off through it. When it is required
to more thoroughly cleanse either of the interior parts of the filter, or
should any of them require to be renewed from wear, the casing may be
separated and the filter removed by unscrewing the screws in the flanges
B, B, and by unscrewing the joints E, E, when free access can be had to
the interior parts of the filter. My filter may be applied in various situa-
tions. In Figures 3, and 4, I have shewn it fitted inside a cistern.
And having now described the nature of my said Invention, and in
what manner the same is to be performed, I declare that what I
claim is,―
First, the placing of an interior conical perforated tube or fine wire
gauze formed into the shape of a tube in tubular filters in the manner
and for the purpose herein-before described, and represented in the
Drawings hereunto annexed; and, second, the means of fastening and
unfastening the parts forming the casing for tubular filters of the
description herein-before explained by flanges and screws.
In witness whercof, I, the said Thomas Russ Nash, have hereunto
set my hand and seal, this First day of December, One thousand
eight hundred and fifty-three.
L
THO R.
TACIT
SH.
זו THC-Uי