EXPERIMENTAL
GLASS BLOWING
Boys, glass tubes are made in the sizes shown
in Fig. 2, and in larger sizes. You will use sizes 2, 4, and 6 in the
following experiments.
Experiment 1. Fun bending glass.
FIG. 2
SIZES OF GLASS TUBING
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Hold a piece of No. 2, with both hands, in the
flame of the alcohol lamp, and turn it constantly (Fig. 3). Do you
find that when the glass becomes nearly red hot, it becomes soft and
bends easily?
FIG. 3
HEATING GLASS TO SOFTEN IT
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Take the tube out of the flame, bent it into
any shape you wish (Fig. 4), and allow it to cool.
Do you find that the glass hardens when it cools and retains the bent
shape?
Heat the tube near the first bend, turn it
constantly, take it out of the flame, and make another bend.
Repeat this and make all kinds of fantastic
shapes.
Place all hot glass on the cooling blocks,
not on the table.
Glass is used in many, many ways by the human
race; for example, to make bottles, tumblers, window glass, and
so on, and
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