Up: Glassmaking
Gilbert: 35 of 65
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in an empty pail or basin. Is there a magical fountain inside the
bottle?
Repeat this with a taller bottle, if you
can find one to fit your two-hole stopper. Do you get a higher
fountain?
Experiment 38. Still more magic.
Make another nozzle and attach it to the
apparatus used in the last experiment by means of the inverted
siphon (Fig. 52).
FIG. 53
STARTING A SIPHON
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Start the experiment as described above. Do you get two fountains?
Experiment 38. To start a siphon.
You can start a siphon without sucking
the air out of it as follows: Fill the siphon with water, put
FIG. 54
SIPHONING SAND
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a finger over each end (1, Fig. 53), place one end in a tumbler
full of water and remove the finger under water (2, Fig. 53),
then remove the other finger. Does the siphon start?
In this case the water you pour into the
siphon drives the air out, and this is the reason you do not
need to suck the air out.
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