It has been necessary, therefore, to provide
inlets with a separating apparatus called "gully" or "catch basin," which
retains as completely as possible all solid matter, mud, excrement, and
_debris_ of every kind which maybe floated in by street washing or by
rain-water, and which may be capable of causing stoppages in the sewers,
the choking up being followed by fermentation and the emanation of noxious
vapors.
M.C. Pieper of Berlin suggests a device for a catch basin, which appears
to meet the requirements. It is in the form of a cylindrical metal box,
enlarged in its upper section to receive a filtering cylinder of
perforated sheet iron, which occupies almost the upper half of the device
and rests upon the smaller lower part. The entire apparatus is covered by
a movable funnel, through which enter water and any rubbish which it may
carry with it. From one side a tube allows the liquid to be discharged,
while a siphon placed on the opposite side serves the same purpose under
certain circumstances, as will be explained.
Figure 1 represents the apparatus discharging under normal conditions. The
heavy matter, sand, stones, etc., falls to the bottom into a receptacle
which can be lifted out from time to time and emptied. The lighter buoyant
matters, straw, vegetable _debris_, paper, etc.
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