Year: 1885

page_text: I, WILLIAM DUNDAS SCOTT-MONCRIEFF, Engineer, of 86, Newman Street, in
the County of Middlesex, do hereby declare the nature of this Iuvention, to be as
follows:-
This Invention has reference to certain improvements in or relating to syphon
cisterns for flushing water closets, the especial object of the Invention being to
provide improved means of starting the action of the syphon, and the provision
of which means will permit of the apparatus being both simplified and cheapened
in construction.
To this end the Invention consists essentially in the construction of the syphon
with a depending leg open to the interior of the cistern and preferably of relatively
larger diameter or area than that of the outlet leg of the syphon, and in the
provision of means for starting the action of the syphon by giving a forcible
impulse or positive movement to the water within the said depending leg of the
syphon sufficient to carry part of it over the bend of the syphon, when its action
is continued automatically until the contents of the cistern are discharged.
In carrying the Invention into effect according to a modification possessing
considerable advantages as regards simplicity and inexpensiveness of construction,
the outlet leg of the syphon is fitted watertight in and through the bottom of
the cistern in any suitable manner, and its inlet leg bends over and depends into
or within the cistern and is continued with a conical enlargement with a cylin-
drical termination open to the interior of the cistern at or near the bottom thereof.
Within such enlarged cylindrical part of the inlet leg there is arranged a freely
fitting piston or plunger formed or provided with an open or valve grating and
with hinged or other suitable clacks or covers adapted to such valve openings and
in such a manner as to have the action hereinafter described.
The piston or plunger is suitably connected by a rod to a lever centred within
the cistern and working in a recess in its bottom and which is suitably connected
with the handle or pull or other means of actuating the apparatus from the closet:
the connection being such that the said actuation from the closet however effected
causes the said piston or plunger to be thrust upwards within the said enlarged
cylindrical termination of the depending inlet leg of the syphon, and owing to the

page_text: conical formation of the part above it and to the said valves of the piston being
closed in this movement thereof a small extent of such upward movement given
as aforesaid to the piston causes a forcible positive impulse and a considerable
extent of movement of the water in the inlet leg of the syphon and above the
piston causing it to overflow into the outlet leg of the syphon and thus to start
the action thereof, the atmospheric pressure then causing the discharge of the
remaining water in the cistern to be effected through the said valve openings
formed in the piston or plunger, whether the latter be held stationary or whether
it be allowed to fall and resume its normal position ready for renewed action; the
said valve openings and their covers being so arranged as to close and allow of the
piston or plunger giving a bodily pushing and lifting movement to the water
above it in starting the syphon, and as to then open and allow of the continued
flow of the remaining water through them.

page_text: I, WILLIAM DUNDAS SCOTT-MONCRIEFF, Engineer, of 86, Newman Street, in
the County of Middlesex, 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 :-
This invention has reference to certain improvements in or relating to syphon
cisterns for flushing water closets, the especial object of the Invention being to
provide improved means of starting the action of the syphon, and the provision
of which means will permit of the apparatus being both simplified and cheapened
in construction.
The improved syphon is illustrated on the accompanying drawings in sectional
elevation, 1, represents the outlet leg of the syphon which is fitted watertight in
and through the bottom of the cistern, 2. in any suitable manner, and, 3. represents
the inlet leg of the syphon which bends over and depends within the cistern and
is continued with a cylindrical or other suitably shaped enlargement or termination
open to the interior of the cistern near the bottom thereof.
4. represents a well or recess formed in the bottom of the cistern and of
relatively larger diameter than that of the depending leg of the syphon, and
in which there is arranged a freely fitting piston or plunger, 5. which is formed
or provided with an open or tubular continuation extending up within the said
enlarged cylindrical part of the inlet leg of the syphon.
The piston or plunger is connected by side rods, 6. to a lever, 7, centred within
the cistern, and which is suitably connected with the handle pull or other means
of actuating the apparatus from the closet the connection being such that the said
actuation from the closet however effected causes the piston or plunger to descend
and cause and upward movement of the water from the well through the open
or tubular part of the plunger into and through the enlarged cylindrical termination
of the depending leg of the syphon, and owing to the proportional formation and
to the relative arrangement of the parts a small extent of such movement given
as aforesaid to the piston causes a forcible positive impulse and a considerable
extent of movement of the water in the inlet leg of the syphon and above the
piston, causing it or part of it to overflow into the outlet leg of the syphon and
thus to start the action thereof, the atmospheric pressure then causing the discharge
of the remaining water in the cistern to be effected through the said depending
leg of the syphon whether the piston or plunger be held stationary or whether

page_text: it be released and allowed to resume its normal position ready for renewed action,
and which position it is caused to assume by the counterweight, 8.
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 general arrangement and combination of the parts hereinbefore described
and the application thereof for the purpose stated.
DAY, DAVIES & HUNT,
Agents for the Applicant.