, remain at the surface,
and are retained by the filter; the water passing through the holes in the
sheet iron rushes in a filtered condition through the annular space which
exists in the upper part between the two cylinders, and escapes by the
waste-pipe when the water reaches a proper level. If at a given moment the
quantity of water flowing in is too much to be discharged through this
waste-pipe, the level of the water mounts in the cylinder until it reaches
the top of the siphon. Immediately the siphon comes into play and empties
the upper part of the apparatus, and the filtered water contained in the
annular space already mentioned quickly re-enters the cylinder through the
perforated sheet iron, and in so doing cleans out the perforations with
considerable energy. This second period is represented in the second
figure.
The mouth of the siphon being placed above the movable basket, the heavy
matters contained in the latter are not in the least disturbed, and the
metallic screen placed over the mouth prevents the entrance of any
floating matters. When siphonic action ceases, the water in the short arm
of the siphon empties itself into the main receptacle, and by so doing
cleanses the screen. During a rain or the washing of the streets, the
siphon can work in concurrence with the ordinary discharge-pipe.
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