Up: Glassmaking
Gilbert: 32 of 65
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two right-angled bends about 1 inch apart at the center, smooth
both ends, and your siphon is complete (Fig. 43).
FIG. 44
A SIPHON
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Experiment 32. Magic.
Put one arm of the siphon in a tumbler
of water and suck air out of the other end. Does the water start
running and does it continue to run in a most magical way (Fig.
44) until the water us below the end of the siphon in the tumbler?
Fill the tumbler with water again, start
the water running, put the outer arm of the siphon in an empty
tumbler, and stand both bumblers on the table (Fig. 45). Does the
water run up one arm of the siphon and down the other into the
empty tumbler? Does it stop running when the levels are the same?
FIG. 45
FROM THE HIGH LEVEL TO THE LOW
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Stand the first tumbler on a book. Does
the water run again and stop when it levels are again the same
(Fig. 46)?
Place the lower tumbler on the book and
the upper tumbler on the table. Does the water now run in the
opposite direction until the levels are again the same?
Raise one tumbler a foot or so above the
table. Does the water run up over the edge and drop into the
second? Now before the upper tumbler is empty, lower it in such
a way that an arm of the siphon is in each tumbler, and raise the
second tumbler. Does the water now run in the opposite direction?
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