Experimental glass blowing for boys

by Carleton John Lynde

Experiment 31. To make a siphon.

Cut off a piece of No 4 tubing 8 inches long, make 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

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 is below the end of the siphon in the tumbler?

FIG. 45
FROM THE HIGH LEVEL TO THE LOW

Fill the tumbler with water again, start the water running, put the outer arm of the siphon in an empty tumbler, and stand both tumblers 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?

Stand the first tumbler on a book. Does the water run again and stop when the levels are again the same (Fig. 46)?