Up: Glassmaking
Gilbert: 64 of 65
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enter and water run out until the mouth is again covered with water?
This is what happens when the poultry, by drinking, lower the water
below the mouth of the bottle.
FIG. 104
A DRINKING FOUNTAIN
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In a poultry fountain the bottle is supported,
as shown, with its mouth under water but above the bottom.
FIG. 105
HOMEMADE DRINKING
FOUNTAIN
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Experiment 80. A drinking fountain.
The drinking fountain (Fig. 104) is similar
in principle to the poultry fountain of the last experiment. The
water is held in the large inverted bottle by the atmospheric pressure
on the water in the lower vessel. Air enters the bottle and water
escapes from it when the level of the water in the lower vessel falls
below
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