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126 BOROUGH OF PADDINGTON.
along a curved length of any Sewer should be double
the fall along a similar length of the straight part of
any such Sewer.
4.—The inverts of every Sewer of greater thickness
than four and a half inches, must be worked in
cement, as shown on sections, and the three centre
courses well bonded and cemented together above
ground in blocks one foot six inches long, which
must not be fixed in position within twelve hours
after having been put together. The invert of every
Sewer which shall be only four and a half inches in
thickness, must be of glazed stone-ware.
5.—The brick-work of every Sewer must be
executed in the best manner, and the bricks properly
bonded, and laid evenly and uniformly to the curvatures
of the moulds and centres, in neat, close, and
regular joints, not exceeding a quarter of an inch in
thickness at the interior surface; and the joints
must be smoothed or struck full and flush with the
face of the work. The centre not to be struck until
at least three feet of the ground be filled in over the
crown of the Sewer.
6.—That for the purpose of constructing any
Sewer, the ground must be excavated at such a
depth, and of such length at a time, as the Surveyor
of the Vestry for the time being shall direct; and
the bed for the invert and sides must be excavated
to the form of the exterior of the Sewer, so
that there may not arise a necessity for filling in
underneath or behind those portions. The sides of