AN IMPROVED SANITARY SAFETY VALVE FOR PREVENTING THE ADMISSION OF FOUL AIR AND GASES INTO DWELLING HOUSES, AND THEIR ESCAPE FROM COMMON STREET SEWERS AND DRAINS."
Year: 1873

page_text: LETTERS PATENT to Edward William Main, of 18, Eldon Place, in the
Town and County of Newcastle-upon-Tyne, Analytical Chemist, for
the Invention of "AN IMPROVED SANITARY SAFETY VALVE FOR PREVENTING
THE ADMISSION OF FOUL AIR AND GASES INTO DWELLING HOUSES, AND THEIR
ESCAPE FROM COMMON STREET SEWERS AND DRAINS."
PROVISIONAL SPECIFICATION left by the said Edward William Main
•
at the Office of the Commissioners of Patents, with his Petition,
on the 25th July 1878.
I, EDWARD WILLIAM MAIN, of 18, Eldon Place, in the Town and
5 County of Newcastle-upon-Tyne, Analytical Chemist, do hereby declare
the nature of the said Invention for "AN IMPROVED. SANITARY SAFETY
VALVE FOR PREVENTING THE ADMISSION OF FOUL AIR AND GASES INTO DWELLING
HOUSES, AND THEIR ESCAPE FROM COMMON STREET SEWERS AND DRAINS," to be as
follows:-
This Invention has for its object a sanitary safety valve for preventing
the admission of foul air and gases into dwelling houses, and their escape
from-common street sewers and drains.

page_text: The sanitary safety valve for preventing the admission of foul air and
gases into dwelling houses, hospitals, infirmaries, and other places,
consists of an india-rubber cup slit at the bottom which is inserted into
the waste or outlet pipes of baths, wash basins, and all other domestic
apparatus having a connection with drains and sewers. The cup is fixed
in an iròn or brass frame and placed at the top or other convenient part
of the waste or 'outlet pipe through which the foul gases come. The
pressure of the water in flowing out opens the slit in the india-rubber
cup, which when the water has passed closes again and effectually
prevents the admission of the foul gases which would otherwise ascend
into the room.
For common sewers in open streets, public urinals, flushing shafts or
other openings connected with drains and sewers, the sanitary safety valve
is constructed of two pieces of india-rubber fixed in a metal or wooden
frame and made to meet or overlap each other. This is placed under the
street grate and any water passing down causes the india-rubber flaps to
open which when the water has passed down close again, and thus
effectually prevent the admission of foul air into the. atmosphere.
The valve may be made of all sizes and shapes to suit the pipes and
drains to which it will be applied.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Edward William Main in the Great Seal Patent
Office on the 24th January 1874.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, Edward
WILLIAM MAIN, of 13, Eldon Place, in the Town and County of 2
Newcastle-upon-Tyne, Analytical Chemist, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-fifth day of July, in the year
of our Lord One thousand eight hundred and seventy-three, in the
thirty-seventh year of Her reign, did, for Herself, Her heirs and suc- 8
cessors, give and grant unto me, the said Edward William Main, Her
special license that I, the said Edward William Main, my executors,
administrators, and assigns, or such others as I, the said Edward William

page_text: Main, my executors, administrators, and assigns, should at any time agree
with, and no others, from time to time and at all times hereafter 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 "A
IMPROVED SANITARY SAFETY VALVE FOR PREVENTING THE ADMISSION OF FOUL AIR
AND GASES INTO DWELLING HOUSES, AND THEIR ESCAPE FROM COMMON STREET
SEWERS AND DRAINS," upon the condition (amongst others) that I, the said
Edward William Main, my executors or administrators, by an instru-
ment 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 Edward William. Main, 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, that is to say:
-
This Invention has for its gbject a sanitary safety valve for preventing
the admission of foul air and gases into dwelling houses, and their escape
from common street sewers and drains.
.
The sanitary safety valve for preventing the admission of foul air and
gases into dwelling houses, hospitals, infirmaries, and other places,
consists of an india-rubber cup slit at the bottom, which is inserted into
the waste or outlet pipes of baths, wash basins, and all other domestic
apparatus having a connection with drains and sewers. The cup is
placed at the top or other convenient part of the waste or outlet pipe
through which the foul gases come, the pressure of the water in flowing
out opens the slit in the india-rubber cup, which when the water hag
passed closes again and effectualy prevents the admission of the foul
gases which would otherwise ascend into the room.
The valve may be made of all sizes and shapes to suit the pipes and
drains to which it will be applied.
A section of the arrangement is shewn in the annexed Drawing.
The waste water flows from the wash basin, bath, or other receptacle
having a connection with the common sewer down the pipe A into the

page_text: leaden box B. In the bottom of the leaden box B the cup O is placed.
This cup is composed of india-rubber with a slit in the bottom, and the
pressure of the water from the wash basin, bath, or other receptacle
opens the slit in the cup and allows the water to pass down, after which
it closes again by its own elasticity, and prevents the foul air and
noxious gases from the common sewer ascending into the chamber of the
dwelling house.
I claim the sanitary safety valve substantially as described.
In witness whereof, I, the said Edward William Main, have here-
unto set my hand and seal, this Twenty-third day of January in 1
the year of our Lord One thousand eight hundred and seventy-
four.