FIL
Year: 1883

page_text: PROVISIONAL SPECIFICATION left by the said William Lee Barstow at
the Office of the Commissioners of Patents on the 13th December 1883.
WILLIAM LEE BARSTOW of Pontefract in the County of York
IN. WATER FILTERS."
"IMPROVEMENTS
The exterior of the filter may be of ordinary form and construction.
C The construction and shape of the interior of the filter may be varied, but are
such that the water to be filtered on being poured into the vessel must pass
through a partition formed of a combination of porous stone, earthenware, terra
cotta or other similar porous material and carbon (animal, granulated, powdered or
in block or otherwise suitably prepared).
The unfiltered water may be made to pass first through the carbon and
afterwards through the porous stone (natural or artificial) but I prefer to pass the
unfiltered water first through the porous stone and afterwards through the carbon
as the larger mechanical impurities are thereby kept from the carbon which does
not so soon become stopped up, and the carbon lasts much longer. Moreover water
filtered in this manner is much purer and the larger impurities which are collected
by the porous stone are more readily washed and removed therefrom than from the
carbon,
Instead of carbon as above mentioned I may use spongy iron or a combination of
carbon and silicon.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said William Lee Barstow in the Patent Office on the 13th June
1884.
WILLIAM LEE BARSTOW of Pontefract in the County of York
IN WATER FILTERS
"
"IMPROVEMENTS
The exterior of the filter may be of ordinary form and construction.
The construction and shape of the interior of the filter may be varied, but are
such that the water to be filtered on being poured into the vessel must pass
through a partition formed of a combination of porous stone, earthenware, terra
cotta or other similar porous material and carbon (animal granulated, powdered or
in block or otherwise suitably prepared.)
The unfiltered water may be made to pass first through the carbon and
afterwards through the porous stone (natural or artificial) but I prefer to pass the
unfiltered water first through the porous stone and afterwards through the carbon
as the larger mechanical impurities are thereby kept from the carbon which does
not so soon become stopped up, and the carbon lasts much longer. Moreover water
filtered in this manner is much purer, and the larger impurities which are collected
by the porous stone are more readily washed and removed therefrom than from the
carbon.
Instead of carbon as above mentioned I may use spongy iron or a combination of
carbon and silicon.
And in order that my invention may be more completely understood reference is
given to the accompanying drawings and to the letters and marks thereon.
DESCRIPTION OF DRAWINGS
Fig 1 is a front elevation. Fig 2 a vertical section, and Fig 3.a sectional plan,
a is the outer body of the filter which may be of ordinary design. About half
way up, the interior of the filter is provided with a ledge b on which rests the
perforated plate c. On the top of this is placed a layer of carbon d prepared in the
ordinary manner for filtering purposes, and on this rests the porous stone e. On the
top of this stone the vertical stones or plates f are arranged as shewn in plan in
Fig 3 and the space between these and the outer shell of the filter is filled with
carbon g similar prepared to d. The number of plates f may be varied according
to the size of the filter.
The unfiltered water must first pass through the porous plates or stones of and
the porous stone e and afterwards through the carbon d and g and lastly through
the perforated plate c. By this arrangement the larger impurities are kept back
by the porous stones e and plates f, so that the carbon does not so soon become
choked up and lasts much longer. Moreover by arranging the porous plates and
stones as shewn in the drawings these can be readily removed for washing off the
coarser impurities which have been collected by them,
Instead of arranging the plates so that the unfiltered water passes first through
the porous stones, they and the carbon pieces may be so arranged that the unfiltered
water passes first through the carbon.
The first arrangement is preferred for the reasons stated.
Instead of carbon as above mentioned I may use spongy iron or a combination of
carbon and silicon.
Having now described the nature of my said Invention and described with the
aid of drawings how the same may be carried into practice I would have it under-
stood that I do not limit myself to the precise details or configuration of the parts

page_text: I have described and shewn as the same may be varied or modified without
departing from the nature of my said invention; what I do claim is :-
A water filter consisting of the vessel a containing a combination of carbon
and porous stone, or earthenware, terra-cotta or similar material arranged
and operating substantially as herein set-forth.
In Witness whereof, I, the said William Lee Barstow have hereunto
set my hand and seal this First day of May in the year of Our Lord One
thousand eight hundred and eighty four.
WILLIAM LEE BARSTOW (L.S.)