To carry a watercourse over a canal, river, road, or railway, several
methods may be employed, as, for example, by aqueducts like those of
Arcueil and Buc near Versailles, and by upright and inverted siphons.
Of these three means, the first is the most imposing, but is also very
costly; and, besides, the declivities as well as the arrangement of the
ground are not always adapted thereto. The inverted siphon is subject
to obstruction and choking up in its most inaccessible parts, while
the upright siphon is easy of inspection, taking apart, etc. But, _per
contra_, the latter loses its priming very easily by reason of the
formation of air spaces.
[Illustration: FALCONETTI'S SIPHON.]
Mr. Falconetti, an inspector of bridges and roadways, has found a means
of rendering the latter occurrence impossible by an arrangement which
is both simple and practical, and which is illustrated herewith. In the
figure, a and b are the two vertical legs of the siphon, both of which
enter the liquid.
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