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and assuming a rising gradient slowly elevates itself in a
course of 90 feet to a level some 4 inches above that of the
lowest point traversed. The Sewer at this spot is characterized
by a displacement sideways, and the jutting wall or
buttress which marks the site of the dislocation receives the
name of "The Offset." From the means it affords of
identifying the place
WHERE THE MEN FELL,
the conformation of the Sewer at this point is a matter of
considerable importance. The gradients from the Offset
onwards still continue to rise slightly for a distance of some
60 feet or more, when the channel reaches an elevation of
10 inches above that of its lowest level. Thence the channel
imperceptibly falls towards the outlet at Stamford Street.
It is to be noticed that the irregularity of the channel
favours the formation of a hollow or basin, the brim of which
extends from the Drop to a point 60 feet beyond the Offset.
At all times, except when emptied by cleansing operations,
the basin retains water or sewage. The depression thus
formed measures in its deepest part a depth of 10 inches, but
growing shallower as the Offset is approached, its depth and
volume beyond this point become insignificant.
THE INLETS TO THE SEWER.
The drains discharging into the Broadwall Sewer in that
part of its course lying between summit and offset are four in
number. The first in point of position and importance is
that which conveys sewage and waste water from the Oil
Refinery in Commercial Road. This drain enters at the head
of the Sewer a few feet below the summit, and discharges its
contents, which are thence conducted without any addition
of any kind from any other source over that part of the