Up: Glassmaking
Gilbert: 65 of 65
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the mouth of the bottle. The water is cooled by the ice surrounding
the lower vessel.
Make a drinking fountain of this kind as in
Fig. 105, ask a friend to hold it, remove the glass
plug from the coupling, and draw a glass of water. Do you observe that
the air bubbles enter the inverted bottle and water flows from it only
when the water level in the half bottle falls below the mouth of the
inverted bottle?
Allow the water to flow continuously. Is
the water level practically constant in the half bottle until the
upper bottle is empty?
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