AN IMPROVED TRAP FOR PRE- VENTING THE INGRESS OF SEWER GAS INTO HOUSes and other BUILDINGS
Year: 1873

page_text: LETTERS PATENT to Henry Dean, of Southam, in the County of War-
wick, Surveyor, for the Invention of "AN IMPROVED TRAP FOR PRE-
VENTING THE INGRESS OF SEWER GAS INTO HOUSes and other BUILDINGS,”
Scaled the 2nd September 1878, and dated the 10th March 1873.
PROVISIONAL SPECIFICATION left by the said Henry Dean at the
Office of the Commissioners of Patents, with his Petition, on the
10th March 1878.
I, HENRY DEAN, of Southam, in the County of Warwick, Surveyor,
› do hereby declare the nature of the said Invention for "AN IMPROVED TRAP
FOR PREVENTING THE INGRESS OF SEWER GAS INTO HOUSES AND OTHER BUILDINGS,"
to be as follows :—
This Invention relates to certain improvements in the construction of
traps for preventing the ingress of sewer gas into dwelling houses or
buildings, the component parts thereof being so arranged as to form a
doublo trap (which I designate "the improved double stench and silth
trap "), so that when placed in a drain outside a house if the gas forces

page_text: a grating provided on the surface instead of further forcing its way
through the second trap into the house. The traps are also so arranged
as to facilitate the removal of silth and other solid matter which if
allowed to accumulate would eventually stop up the trap and prevent
its proper working.
My improved trap is constructed of iron, stoneware, or other suitable
metal or material, and of various sizes, depending upon its require-
ments.
According to one modification it is made of two separate and distinct 1
parts, the exterior one of which is built or, fixed into the drain. It is
provided with two downward projections, which form a double dip trap,
and which effectually seal both the inlet and outlet. The interior on is
formed as a receptacle for the silth and other solid matters, and fits into
the lower part of the exterior portion (the general form of which pre-
vents any deposit lodging anywhere but in the receptacle), so that it
can be readily removed therefrom and emptied and replaced when
required. This is an especial advantago where the drain is at such a
depth that it cannot be reached to be cleaned out by band, as a chain or
rod can be secured to the handle of the inner part, by which it can be
raised to the surface, and then it can be emptied of its contents and
replaced when necessary.
The receptacle is divided into two parts by a vertical partition which
extends up to the water line, thus forming the double trap, for though
the division be not water-tight it does not affect the efficiency of tho :
trap, as any gas coming from the outlet would find its way to the surface
of the liquid in (and on that sido of) the trap immediately it got under
and past the first dip, between the two of which the vertical partition
is. Two smaller receptacles, each filling into the above-named recop-
tacle (one on each side of the vertical partition) can be added to this
modification of the trap. Such arrangement would materially assist in
thoroughly cleaning out the trap when at a greater depth than could be
reached by the hand.
According to a second modification of my Invention the arrangements
are water-tight, the vertical partition being fixed to or forming part of
the exterior part of the trap, and on each side thereof is placed a separate

page_text: movable receptacle. It can be arranged so that before any gas which
may force its way past the first trap can ascend the grating or ventilating
pipe and reach the external air it can be made to pass through a
movable tray of charcoal or other purifying medium, by which it is
5 filtered of all impurities.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Henry Dean in the Great Seal Patent Office
on the 10th September 1873.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, HENRY
DEAN, of Southam, in the County of Warwick, Surveyor, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Tenth day of March, in the year
of our Lord One thousand eight hundred and seventy-three, in the
thirty-sixth year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said Henry Dean, Her special licence
that I, tho said Henry Dean, my executors, administrators, and assigns,
or such others as I, tho said Henry Dean, 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, usc, exercise, and vend, within the United
Kingdom of Great Britain and Ireland, the Channel Islands, and Isle of
Man, an Invention for "Ax IMPROVED TRAP FOR PREVENTING THE INGRESS
OF SEWER GAS INTO HOUSES AND OTHER BUILDINGS," upon the condition
(amongst others) that I, the said Henry Dean, my executors or
administrators, by an instrument in writing under my, or their, or one
of their hands and seals, should particularly describo and ascertain the
nature of the said Invention, and in what manner the same was to be
performed, and cause the samo to be filed in the Great Seal Patent
Office within six calendar months next and immediately after the dato
of the said Letters Patent.
.
NOW KNOW YE, that I, tho said Henry Dean, do hereby declare
the nature of the said Invention, and in what manner the same is to
bo performed, to bo particularly described and ascertained in and by the

page_text: or changing the general features of the improvements illustrated; tho
trap can also be made without the groove 8 if desired. As the inlet
would be generally connected with the waste water pipes from pumps or
cisterns, the trap could at any time be flushed or swilled through to
prevent the accumulation of stagnant liquid. Connecting pipes for
ventilators can be introduced and fixed where necessary.

page_text: And, secondly. The application to a single yard gully trap of the
arrangements for cleansing the same, substantially as described and as
illustrated.
In witness whereof, I, the said
my hand and seal, this Fifth
Henry Dean, have hereunto set
day of September, in the year 5
of our Lord One thousand eight hundred and seventy-three.