Experiment 42. To make a trick squirt bottle.
You can have any amount of fun with a trick squirt bottle. It is exactly the same as the squirt bottle described in Experiment 41 except that it has a hole just below the bend (Fig. 57).
FIG. 58
MAKING A SMALL HOLE
To make the hole, make the long bent nozzle as in the last experiment, then heat the tube just below the bend in the blowpipe flame, touch a piece of glass tube to the red-hot glass (1, Fig. 58), and pull it away (2, Fig. 58). Do you find that the hot glass is pulled out into a thin pointed tube? Break off the thin tube close to the large tube, heat in the blowpipe flame until the edges are smooth and at the same level as the sides of the large tube. Flare the edges of the hole, if necessary; it should be about ⅛ inch in diameter.
FIG. 59
TRICK SQUIRT BOTTLE
Now fill the bottle with water, and blow hard (Fig. 59). Do you find that one stream of water is driven into your face and another out of the nozzle?