AN IMPROVED. CONSTRUCTION, OR ARRANGEMENT OF) APPARATUS FOR VENTILATION OF DRAINS TUNNELS AND CULVERTS AND DISINFECTION OF SEWAGE AND OTHER GASES
Year: 1884

page_text: I EDWIN MIDGLEY of The London Institution, Finsbury, City of London
Gentleman, do hereby declare the nature of my said invention for "AN
IMPROVED. CONSTRUCTION, OR ARRANGEMENT OF) APPARATUS FOR VENTILATION OF
DRAINS TUNNELS AND CULVERTS AND DISINFECTION OF SEWAGE AND OTHER
GASES" to be as follows:-
The object of my invention is to construct or arrange an apparatus for containing
a disinfecting or like liquid, in which the lower end of a bell can float by means of
buoys attached thereto the lower edge or edges of the bell is or are serrated or
notched to break up the gases into fine streams in passing from the bell through
the layer of disinfectant which is effected by the pressure of gas from within the
bell, the dip of the bell not being sufficient to completely seal the passage.
The vessel containing the disinfectant has a central tube standing in the bell
and the foul gases have to. pass over the top edge of it and impinge upon the
surface of the liquid. The central tube forms part of the outlet from the drain
and just above the line of attachment I fit a balanced valve to open inwards but
hermetically seals itself against a cushion seating to the, internal pressure.
The lower part of the vessel and the gas outlet pipe or central tube are con-
nected by a branch pipe provided with a tap, which on being opened can discharge
any quantity of the disinfectant into the drain when desired without interfering
with the efficiency of the apparatus. This discharge of liquid or part thereof
facilitates renewal of disinfectant at any time.

page_text: "
I EDWIN MIDGLEY of "The London Institution" Finsbury, city of London,
Gentleman do hereby declare the nature of my said invention for AN IMPROVED
CONSTRUCTION OR ARRANGEMENT OF APPARATUS FOR VENTILATION OF DRAINS
TUNNELS AND CULVERTS AND DISINFECTION OF SEWAGE AND OTHER GASES and
in what manner the same is to be performed to be particularly described and
ascertained in and by the following statement :-
"
The object of my invention is to construct or arrange an apparatus A for con-
taining a disinfecting or like liquid B in which the lower end of a bell C can float
by means of buoys D, D, attached thereto..
'
"
The lower edge or edges of the bell C is or are preferably comb shaped, serrated,
notched plain, roughened or otherwise to break up the gases into fine streams in
passing from the bell C through or over the layer of disinfectant B. The dip of the
bell is not sufficient to completely seal the passage.
The vessel A containing the disinfectant has a central tube E standing in the
bell C and the foul gases have to pass over the top edge F of it and impinge upon
the surface of the liquid B. The central tube E forms part of the outlet G from
the drain and just above the line of attachment I fit a balanced valve H to open
inwards. but hermetically seals itself against a cushion seating to the internal
pressure.'
The lower part of the vessel A and the gas outlet pipe or central tube E are
connected by a branch pipe J provided with a tap K which on being opened can
discharge any quantity of the disinfectant into the drain when desired without
interfering with the efficiency of the apparatus. This discharge of the liquid or
part thereof facilitates renewal of disinfectant at any time..
The bell is so supported by the buoys D that the serrations, notches or comb
like teeth a are not wholly submerged but the openings are so much above the
disinfecting liquid as not to impede the free passage of gas, which by the number
of serrations, cause a perfect diffusion of the gas into fine streams. This is par-
ticularly so where there is no gas pressure in the drain, but where a pressure does
exist caused by local circumstances the serrations are submerged.
Several examples of the application of my invention are shown on the annexed
sheet of drawings Figure 1 indicates its position in the man hole of a ventilating
shaft of say a street sewer or drain. Figure 2 the application of the liquid holding
vessel directly over a shaft of a cesspool the intermediate pipe and valve being
dispensed with.
"
J
Figures 3 and 4 show its application to a soil pipe fitted to the outside of a wall
such as that of a dwelling house. In this case the valve H is arranged at the top
of the pipe G and is made to open inwards so that at each flushing of either of the
closets, the down rush of water causes the valve to open for air to pass down
with it. I have shown the apparatus A about level with the lower closet and on
an elbow or branch of the soil pipe, but it may be placed at any convenient
position or on the outside trap or the branch and disinfecting vessel may be
within the closet if desired.
Figures 5 and 6 show its application to the roof of a tunnel or vault which
has to be ventilated and if necessary the liquid can be constantly supplied, the
pipe E being perforated or slotted b. b for the overflow to trickle down into the
conduits M, M. By this means when steam or gaseous vapour has to be con-
densed or precipitated it will only be necessary to use a liquid compound suitable
for that urnose.

page_text: Having now particularly described and ascertained the nature of my said
nvention and in what manner the same is to be performed I declare that what
I claim is
.
1 The apparatus hereinbefore described and its employment for disinfecting
sewage or other gas or noxious vapours.
2 The combination of the bell C (and buoyant attachments D D) as a floating
appliance having the lower edge or edges a comb shaped, serrated or
otherwise as and for the purpose described.
H.. GARDNER,
166, Fleet Street, London,
Agent for the Applicant.