and to keep them pressed together until the cement in hard. To
clean the glass wash it thoroughly with soap and water, rinse,
and dry with a clean cloth.
There are many excellent glass cements on
the market. Some of these are solid and used only on hot glass;
FIG. 92
CEMENTING GLASS
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others are liquid and are used on cold or hot glass.
Cement two strips of glass together (Fig.
92) with sealing wax or solid shellac or some other solid cement
as follows: Clean the glass thoroughly, place in the oven or on
the stove, heat gradually until the glass just melts the cement,
rub the cement over both surfaces, bring them together when the
cement is fluid, press them together to squeeze out as much cement
as possible, and keep them pressed together until the cement is
hard.
Cement a strip of wood to a strip of glass
in the same way.
Cement a strip of wood to a strip of glass
with liquid glue, both wood and glass being cold. Keep them
pressed together until the glue is dry, perhaps a day or two.
MAGICAL EXPERIMENTS
Boys, you can perform many magical experiments
with apparatus made out of the glass tubes, rubber stoppers, and
rubber unions supplied with "Experimental Glass Blowing." We outline
a number in the following pages. You can invent many more for
yourselves.
MAGIC WITH FLAMES
Experiment 70. Magic lighting.
Light your alcohol lamp, blow it out, and
bring a lighted match
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