Improvement in Water Filtration.
Year: 1888

page_text: Date of Application, 7th Aug.. 1888
Complete Specification Left, 28th Sept., 1888
Complete Specification Accepted, 2nd Nov., 1888
PROVISIONAL SPECIFICATION.
Improvement in Water Filtration.
WILLIAM JOHNSTONE Doctor of Philosophy, Public. Analyst & Consulting Chemist
13 Fish Street Hill Eastcheap London do hereby declare the nature of this invention
to be as follows:-
--
I take an ordinary Filter Jar & fix a Tubo No. 1 between the Filtered and unfiltered
water division, 1 next take another Tube No. 2 of somewhat greater diameter closed
at one end & inserted over No. 1 resting on its apex & reaching nearly to the bottom
of the water division, these two tubes forming a syphon which is the essential
point of the invention.
The invention about to be described has been devised to overcome certain defects
in domestic and other filters.
I take an ordinary Filter Jar and fix a Tube No. 1, between the Filtered & Un-
filtered Water division.
I next take another Tube No. 2 of somewhat greater diameter closed at one end and
insert it over No. 1 resting on its apex and reaching nearly to the bottom of the water
division.
The filtering medium is then placed in its proper position round the Tube No. 2 and
when so placed the filter is ready for use.
The upper or unfiltered water division is then filled with water and the filtration of
the water immediately commences the water ascending inside of Tube No. 2, until it
reaches the apex or top of the tube, when it immediately flows down through No. 1
Tube, and through the intervention of No. 2 Tube the whole of the water is filtered
and syphoned from the top or unfiltered water reservoir to the bottom or filtered water
reservoir.
This syphon is the essential point of the invention as applied to the filtration of water
for domestic use as substantially hereinbefore set forth.
Dated this 7th day of August 1888.

page_text: 1, WILLIAM JOHNSTONE Doctor of Philosophy, Public Analyst and Consulting
Chemist of 13 Fish Street Hill Eastcheap in the City of London in the County of
Middlesex 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 invention about to be described has been devised to overcome certain defects in
domestic and other Filters.
I take a domestic Filter Jar and fix a Tube No. 1 between the Filtered and un-
filtered Water division.
I next take another Tube No. 2 of somewhat greater diameter closed at one end
and insert it over No. 1 resting on its apex and reaching nearly to the bottom of the
water division.
The Filtering medium is then placed in its proper position round the tubes and
when so placed the Filter is ready for use, the water ascending inside of Tube No. 2
until it reaches the apex or top of the capillary tube No. 1 when it immediately flows
down through the same and through the intervention of No. 2 the whole of the water
is filtered and syphoned from the top or unfiltered reservoir to the bottom or filtered
water reservoir.
Having now particularly described and ascertained the nature of my said
Invention, and in what manner the same is to be performed, I declare that what I
claim is
The use of this syphon as the essential point of my invention as applied to the
filtration of water for domestic and other uses, as substantially hereinbefore set forth.
Dated this Twenty-eighth day of September 1888.
WILLIAM JOHNSTONE, Ph. D., F.I.C., F.C.S.,
Public Analyst.