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(f) Such room shall be effectually protected against the
rising of any effluvia or exhalation by means of a layer
of good cement concrete at least six inches thick laid
upon the soil of the site of the entire room, or in
some other effective manner.
(g) Every such room which is without a fireplace, and a
flue properly constructed and properly connected with
such fireplace, shall be provided with special and
adequate means of ventilation by a sufficient aperture
or air shaft, which shall provide an unobstructed
sectional area of 100 square inches at the least.
(h) Such room shall have one or more windows opening
directly into the external air, with a total area clear
of the sash frames equal to at least one tenth of the
floor area of the room, and so constructed that onehalf
at least of every such window can be opened, and
that the opening may in every case extend to the top
of the window.
Under the Housing and Town Planning Act, 1909. the Watson
Street Area was inspected and reported upon.
All the necessary facts were entered in a Special Register; but it
was not found necessary to recommend any action apart from that
taken under the Nuisance Sections of the Public Heahh (London)
Act, 1891.
factories and workshops.
At the end of the year 1910 there were on the Register 254
factories, workshops and work-places.