IF wind is blown through the mouth of certain figures, they spout up water through some other place For example, if a satyr holds a wine skin water shall be spouted up through the skin.
A B C D (fig. 54), is
an air-tight pedestal on which the figure is placed through the mouth of
the figure a tube, E F is inserted, communicating with the pedestal, and
having underneath it a small plate, G H, which closes the aperture F of
the tube, and is supported by pins to which buttons are attached, that
the plate may not fall off. Another tube, K L, is passed through the
pedestal, of which the extremity, K, must be contiguous to the point at
which the water-jet is to be, and the extremity, L, reach to the bottom
of the pedestal, leaving only a passage for the water. At the extremity
K there must be a valve or tap by which the aperture K, which is very
small, may be shut. Now if we pour any quantity of water into the
pedestal through a hole, which we must afterwards stop, and, having
closed the aperture K, blow in air through the tube E F, the air blown
in will thrust aside the plate and descend into the pedestal: and, if
this is done several times, the air in the pedestal will be compressed
and close the plate. Let the valve or tap be opened, and after a short
time the compressed air will drive the liquid in the pedestal violently
out through the aperture K, until all the liquid is spouted up, and the
air is brought back to its natural state, that is, in which it is no
longer subject to compression.