To prime the siphon, we shut the cocks, e and f, open the valves, j and
m, and pour in water until the whole affair (siphon and reservoir) is
full; then we close the cock, m, and open the three others. The siphon
thus becomes primed, and begins to operate as soon as any water reaches
one or the other of the lower receptacles. As the cock, j, is constantly
turned on during the operation of the siphon, the air that has been able
to accumulate in the lower compartment, A, of the reservoir, h, would
finally unprime the siphon by intercepting communication between its two
legs. In order to prevent such a thing from occurring, it suffices to
expel the air, from time to time, that accumulates in the chamber,
A, this being done, without stopping the operation of the siphon, as
follows:
After closing the cock, j, water is poured into the reservoir, and,
running down to the lower compartment, drives out the air through the
cock, m. This operation once effected, it only remains to turn off the
cock, m, again, and open j in order to establish the normal operation.
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