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to the Interceptor, and by outlet shafts of not less than 3-in.
in diameter, prolonged directly upwards from the soil pipes
outside the house, to the highest point of the roof, of at least
three feet above the top of the highest windows.
7.—An inspection-chamber shall, where practicable, be
provided between the Interceptor and the fresh-air inlet.
8.—Rain-water pipes, sink-pipes, and waste-water
pipes of all kinds shall discharge outside the house into a
stoneware syphon gully communicating directly with the
underground drain.
9.—All sink pipes, as also soil pipes, shall, as far as
practicable, have no sharp curves.
10.—Proper Y junctions shall, in all cases, be made in
connection with all underground drains. No right angle
junctions shall be allowed.
11.—Water closets, if not outside the house, shall, where
practicable, be placed against an external wall, and be
properly ventilated by windows communicating directly
with the external air.
12.—Cisterns for drinking water shall be of sufficient
size, made of slate or zinc or galvanized iron, well covered,
and so placed as to allow of easy cleansing, and not be exposed
to risk of contamination.
13.—If a cistern be used in common for drinking purposes
and for flushing a water closet, it shall be provided
with a waste preventer of approved pattern.
14.—There shall be an open air space of at least 6-in.
between the lowest floor of all newly erected Buildings and
the surface of the sub-soil, and this space shall be properly
ventilated by means of air bricks suitably placed.