An Improved Method of Ventilating Sewers.
Year: 1899

page_text: PROVISIONAL SPECIFICATION.
An Improved Method of Ventilating Sewers.
I, JOHN MORGAN, of Sunny Bank, Pontardawe, in the County of Glamorgan-
shire, Engineer and Surveyor, do hereby declare the nature of this invention
to be as follows:-
My invention relates to an improved method of ventilating sewers.
The air inlet is arranged as follows:-A grooved flange is formed at the bottom
of the frame which supports the manhole grating. In this flange a hole is made
to receive a pipe which is firmly and tightly fixed therein. This pipe, which
may be of any given diameter, extends into the manhole to a point which will
be below the level of the soffit of the sewer arch. The groove in the flange is
filled with fine sand on which the corresponding rim of the upper end of the
dirt box rests, thus rendering it airtight. This air inlet arrangement is fitted
at every alternate manhole, leaving the intermediates to act as outlets with shaft
connections. The outlet shaft is to taper from about six inches at the closed
intermediate manhole, or at a more convenient junction with the sewer, as the
case may be, to four inches at the bottom of the upright portion of the shaft
attached, for instance, to the gable of a house. The vertical length of the shaft
is to taper in the inverse ratio, that is to say, from about six inches near the
top to four inches at the surface line. The extreme top to be bevelled inwards
to reduce it to the same sectional area as that at the base.
The object is-1, to form a passage through which air may enter the sewer,
while it will be impossible for gas to escape into the atmosphere through the
same channel, as it will pass up or down the sewer under the level of the bottom
of the air inlet pipe.
2. To allow the air after passing along the sewer from the inlet, to pass out
by means of a tapered shaft as before described. The enlargement of the upright
portion of the shaft is to allow room for the cold sewer air to expand, when the
pipe is heated by the sun, and thus reduce the friction to a minimum.
Dated this 28th day of June 1899.
J. P. BAYLY,
18, Fulham Place, London, W., Agent for the Applicant.
An Improved metho
I, JOHN MORGAN, of Sunny Bank, Pontardawe, in the County of Glamorgan-
shire, Engineer and Surveyor, do hereby declare the nature of this invention
Price &d |

page_text: and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement: -
My invention relates to an improved method of ventilating sewers.
And in order that my invention may be thoroughly understood, I now proceed
to describe the accompanying drawing thereof, reference being had to letters and
figures marked thereon.
Fig. 1, is a plan of the man-hole cover, frame and flange for dirt box with air
inlet pipe.
Fig. 2, is a vertical section of the man-hole shewing ventilating cover, air
inlet pipe and air tight dirt box.
The arrows indicate the travel of the air through the grating and down the
micuth of the air inlet pipe.
The air inlet is arranged as follows:-A grooved flange a is formed at the
bottom of the frame which supports the manhole grating c. In this flange a
a hole is made to receive a pipe e which is firmly and tightly fixed therein.
This pipe e which may be of any given diameter, extends into the man hole f
to a point which will be below the level of the soffit of the sewer arch. The
groove in the flange a is filled with fine sand on which the corresponding rim
of the upper end of the dirt box rests, thus rendering it airtight. This air
inlet arrangement is fitted at every alternate man-hole, leaving the intermediates
to act as outlets with shaft connections.
The object and principle of my invention is to form a passage through which
air may enter the sewer (through pipe e), while it will be impossible for gas to
escape into the atmosphere through the same channel, as it will pass up or down
the sewer under the level of the bottom of the air inlet pipe e.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, 1 declare that what
I claim is
1. The method of ventilating sewers, substantially as above described in this
specification and illustrated in the accompanying drawing.
2. In ventilating sewers, the combination and arrangement of the flange 16
groove frame bhole d pipe e dirt box h and man-hole grating e, substantially
as herein described and according to the accompanying drawing.
Dated this 28th day of March 1900.
J. P. BAYLY,
18, Fulham Place, London, W., Agent for the Applicant.