Year: 1886

page_text: We WILLIAM BARTHOLOMEW and EDWIN ANDREW REYNOLDS, both of the Firm
of B. Finch and Company, of 82 Belvedere Road, Lambeth in the County of
Surrey, Sanitary Engineers do hereby declare the nature of this invention to be
as follows:-
Our Invention relates to the syphons used in flushing tanks for the intermittent
delivery of water therefrom, with the object of keeping, main drains free from
deposit, for flushing urinals and closets, and for similar purposes, and it applies
either to annular or to bent leg syphons.
A deep trap is commonly used for the purpose of enclosing a cushion of air inside
the syphon until a head of water is reached at some distance above the top of the
syphon, but this cushion of air has hitherto been relieved on the sewer side, an
arrangement open, amongst others, to the great objection that if the sewer is not
suitably ventilated a back pressure of air arises which obstructs the escape of air
under the compression of the head of water in the Tank, so that only a dripping of
water takes place down the syphon, in the same proportion as the inflow, and
under such circumstances a syphonic action cannot be set up.
We propose to obviate these defects and to avoid the varying pressures met with
in main drains by relieving the cushion of air on the Tank side.
To accomplish this we purpose enclosing within the syphon a small trap, one end
of which will terminate in the water of the deep trap, the other reaching nearly up-
to the crown of the syphon, as high up as possible.
From this crown of the small trap we propose to carry up ‘a relief pipe, rising
say a few inches above high water level in the Tank.
We provide an air-vent by making a small hole in the short leg of the syphon
on the tank side, or in any suitable manner, to determine the amount of
compression.
When applied to tanks of small dimensions we propose that the relief pipe be
almost closed at the end, and for large tanks with a relief valve, having preferably
a mica flap enclosed in a perforated case at the top; the valve opening upwards to
allow the compressed air to escape, but closing when the syphon has started, to
prevent air from entering into it, which would tend to stop its action.
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page_text: We WILLIAM BARTHOLOMEW and EDWIN ANDREW REYNOLDS both of the Firm
of B. Finch and Company of 82 Belvidere Road Lambeth in the County of
Surrey Sanitary Engineers 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:-
Our Invention relates to the Syphons used in flushing tanks for the intermittent
. delivery of water therefrom, with the object of keeping main drains free from
deposit, for flushing urinals and closets and for similar purposes, and it applies
either to annular or to bent leg syphons.
A deep trap is commonly used for the purpose of enclosing a cushion of air inside
the syphon until a head of water is reached at some distance above the top of the
syphon, but this cushion of air has hitherto been relieved on the sewer side, an
arrangement open, amongst others, to the great objection that if the sewer is not
Buitably ventilated a back pressure of air arises which obstructs the escape of air
under the compression of the head of water in the Tank, so that only a dripping of
water takes place down the syphon in the same proportion as the inflow, and
under such circumstances a sypbonic action cannot be set up.
We obviate these defects and avoid the varying pressures met with in main
drains by relieving the cushion of air on the Tank side.
To accomplish this we enclose within the syphon a small trap, one end of which
will terminate in the water of the deep trap, the other reaching nearly up to the
crown of the syphon; as high up as possible.
From this crown of the small trap we carry up a relief pipe rising say a few
inches above high water level in the Tank.
We provide an air vent by making a small hole in the short leg of the syphon
on the Tank side, or in any suitable manner, to determine the amount of
compression.
When applied to Tanks of small dimensions the relief pipe may be almost closed
at the end, and for large tanks we give preference to a relief valve having a mica
flap enclosed in a perforated case at the top; the valve opening upwards to allow
the compressed air to escape, but closing when the syphon has started, to prevent
air from entering into it, which would tend to stop its action.
On the accompanying sheet of Drawing—
Figure 1 is a section of a flushing syphon embodying our Invention.
Figure 2. is a section, drawn to a larger scale, of our apparatus for relieving the
compressed air when the water in cistern has reached a certain level.
Figure 3 shows the application of our relieving apparatus to an ordinary bent
leg or annular syphon for use in horizontal drains and
Figure 4 shows in section a mica valve which we place on the end of the tube E
when the syphons are of large diameters and the duration of the discharge a long
period.
It will be seen that the bent tube forms a trap, the end A of the tube reaching
up as high as possible into the crown of the syphon so that all the air can escape

page_text: at the proper time; the other end B, is turned down and dips as low as possible
into the main trap water-When compression takes place, the water in the small
trap C is gradually pushed over into leg B.
When the air line has reached the bend D of the trap C, the contents of the
trap is suddenly thrown down the leg B, the compressed air escapes up tube E, a
syphon action is thus set up and water rushing into the cup at F prevents air
passing down tube E and through small trap C to stop the action of the syphon-
This combination enables us to place the trap inside the cistern and out of sight,
which is a great advantage when they are used for trough closets and urinals; the
ordinary trap below the tank being very unsightly.
Having now particularly described and ascertained the nature of our said
Invention and in what manner the same is to be performed, we declare that
we claim is
1. In a flushing syphon, releasing the compressed air on the Tank side, substan-
tially as described.
2. A flushing syphon having our relieving apparatus arranged within a cistern,
substantially as described and shown Figure 1 of the Drawing.
3. The application of our relieving apparatus to the form of syphon shown
Figure 3 of the drawing, substantially as specified.
Dated this Seventh day of May 1886.
For the Applicants,
W. E. GEDGE,
Agent.