Im- PROVEMENTS IN SIPHONS FOR EFFECTING INTERMITTENT DISCHARGE OF LIQUID
Year: 1875

page_text: LETTERS PATENT to Rogers Field, of No. 5, Cannon Row, West-
minster, in the County of Middlesex, for the Invention of “Im-
PROVEMENTS IN SIPHONS FOR EFFECTING INTERMITTENT DISCHARGE OF LIQUID
"
Sealed the 11th January 1876, and dated the 28th October 1875.
PROVISIONAL SPECIFICATION left by the said Rogers Field at the
Office of the Commissioners of Patents, with his Petition, on the
28th October 1875.
I, ROGERS FIELD, of No. 5, Cannon Row, Westminster, in the
County of Middlesex, do hereby declare the nature of the said Inven-
tion for "IMPROVEMENTS IN SIPHONS FOR EFFECTING INTERMITTENT DISCHARGE
OF LIQUID FROM SEWAGE TANKS AND OTHER VESSELS," to be as follows:-
In the Specification of a Patent granted to me on the 11th November,
1872, No. 3348, I described arrangements of vessels or tanks fitted with
siphons for the collection and intermittent discharge of sewage or other
liquids.
My present Invention relates to improvements in the construction
and arrangement of siphons applicable to such purposes, whereby I am
enabled to obtain the intermittent discharge with greater certainty, and

page_text: to prevent partial action of the siphon. For this purpose I make the
discharging limb of the siphon, and its connection to the bend of the
siphon, in such a manner that a small quantity of liquid flowing over
the bend instead of running down along the sides of the discharging
limb is caused to descend clear of the sides, whereby it is rendered more
effective in displacing the air in the discharging limb, and thereby
starting the siphon action. One way of effecting this is to make the
bend terminate with a mouth smaller than the discharging limb. I also
provide at the mouth of the discharging limb, besides the discharging
trough and weir described in my Specification above referred to, a
small secondary siphon bending over the weir, and so arranged that it
is brought into action when liquid from the main siphon flows in con-
siderable quantity over the weir. When the flow from the main siphon
has nearly ceased, this secondary siphon continuing to act discharges the
liquid from within the weir, thereby unsealing the discharging mouth
of the main siphon and causing its action completely to cease until it
again becomes charged. This arrangement may be modified by making
an open receptacle, into which the main siphon discharges in one piece
with a secondary siphon, constituting a siphon trap. In this case the
secondary siphon is made of sufficient size to take the whole discharge
from the main siphon, and its action in unsealing the mouth of the
main siphon is similar to that of the small siphon and weir above
described, the upper bend of the trap acting as the weir until the
secondary siphon is charged. A secondary siphon, such as I have
described above, may in like manner be applied to the chamber some-
times used to receive the discharge from a main siphon for the purpose
above set forth.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Rogers Field in the Great Seal Patent Office on
the 27th April 1876.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, ROGERS
FIELD, of No. 5, Cannon Row, Westminster, in the County of Middle-
sex, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-eighth day of October, in the

page_text: year of our Lord One thousand eight hundred and seventy-five, in the
thirty-ninth year of Her reign, did, for Herself, Her heirs and suc-
cessors, give and grant unto me, the said Rogers Field, Her special
license that I, the said Rogers Field, executors, administrators,
and assigns, or such others as I, the said Rogers Field, my executors,
administrators, 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
SIPHONS FOR EFFECTING INTERMITTENT DISCHARGE OF LIQUID FROM SEWAGE TANKS
AND OTHER VESSELS," upon the condition (amongst others) that I, the
said Rogers Field, my executors or administrators, by an instrument in
writing under my, or their, or one of their hands and seals, 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 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 Rogers Field, do hereby declare
the nature of the 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 accom-
panying Sheet of Drawings and to the figures and letters marked
thereon, that is to say :-
In the Specification of a Patent granted to me on the 11th November,
1872, No. 3348, I described arrangements of vessels or tanks fitted with
siphons for the collection and intermittent discharge of sewage or other
liquids.
My present Invention relates to improvements in the construction
and arrangement of siphons applicable to such purposes, whereby I am
enabled to obtain the intermittent discharge with greater certainty, and
to prevent partial action of the siphon. For this purpose I make the
discharging limb of the siphon, and its connection to the bend of the
siphon, in such a manner that a small quantity of liquid flowing over
the bend instead of running down along the side of the discharging limb
is caused to descend clear of the sides, whereby it is rendered more
effective in displacing the air in the discharging limb, and thereby
starting the siphon action. One way of effecting this is to make the

page_text: clear from the sides of the limb A, carries with it air, which is separated
from the liquid at the bottom of the limb and rises in bubbles outside
of its mouth. In Fig. 3 I have shewn diagrammatically an arrange-
ment which may be used in lieu of that shown in Fig. 1. In this case
the line of the discharging limb is made with a break at K, and the
bend C is made with a gullet or small groove or furrow c on its under
side, as shewn in the transverse section Fig. 3*, the connection at K of
the discharging limb A to the bend C having the desired effect of
causing the liquid which flows over the bend to descend clear of the
sides of A. The discharging trough D may be made with a siphon
outlet H, which operates like the small siphon E in Fig. 1. It is to be
understood that the secondary siphon E in Fig. 1 or H in Fig. 3
might be employed with a siphon of ordinary construction for the
purpose above referred to, also that the enlargement of the limb A and
the cone B, or the break at K with the gullet c, might be applied
without the siphon E or H.
Having thus described the nature of my Invention, and in what
manner the same is to be performed, I claim,―
First. Connecting the discharging limb of a siphon to the bend with
an enlargement or break such that liquid flowing over the bend shall
descend the limb clear of the interior surface thereof, substantially as
and for the purposes herein set forth.
Second. Providing at the mouth of the discharging limb of a siphon
a secondary siphon, substantially as and for the purposes hercin set
forth.
In witness whereof, I, the said Rogers Field, have hereunto set
my hand and seal, this Twenty-seventh day of April, in the
year of our Lord One thousand eight hundred and seventy-six.