Several kinds of liquid having been poured into a vessel through one mouth, it is required that tbrough the same pipe they shall flow out separately at pleasure.
Let A B (fig.22) be a vessel closed at the neck
by the partition C D; and let there be in it several vertical
partitions, extending to the partition C D and making as many chambers
as we wish to pour in liquids. Suppose, for the present, that these are
two in number, and let the partition be E F. In the partition C D
pierce fine holes, as in a sieve, opening into each chamber, and air
holes, G, H, close to the partition, also opening into the chambers:
again, at the bottom let there be small tubes, K, L, communicating with
the chambers and opening into the common pipe M. If, having first
closed the vents G, H, and the pipe M, we pour one of the liquids
through the mouth of the vessel, it will enter into neither chamber, as
the air has no means of escape: but if one of the vents be opened, the
liquid will pass into that chamber to which the vent belongs; and if,
after closing this vent again, we pour in the other liquid and set free
the other vent, the liquid will pass into the other chamber. Now let
all the vents and the sieve-like holes be closed, and, on opening the
pipe M, no discharge can take place until one of the vents be opened;
when, the air having found an entrance, the liquid contained in that
chamber will flow out. If this vent be closed and the other opened, the
same resuit will follow.