The Virginia enterprise., 1911-02-03
FEW EXPERIMENTS FOR HOME
Dull Winter Evenings Can Be Whi'ed
Away Pleasantly and ProfitabIy
-lnventions Amaze.

whiled away pleasantly and protltably
by making experiments Of various
kinds. Many of these will be found to
be very interesting and amusing. A
list of experiments, with instructions
how to conduct them, may be found In
any textbook on the science of ply
sizes. but these often imply thor
ough scientific knowledge of the sub
ject at hand, as we'll as expensive ap
paratus. Still, very many experiments
can be made with comparatively
cheap apparatus, and little expo
sible for you to invent experiments
Of your own, with which to delight or
amaze your friends. Some easy ex.
periments are given below:
Experiment 1-Place a lighted can.
die in goblet. After it has burned
a few seconds place over the top of
the glass piece of wet paper having
a hole cut in the middle. Then press
down upon this paper another glass,
inverted. The paper will make the
L"O 6AdooCS III IOSCLAS4 VOL tAt3AtAy
In very short time the candle will
go out for want of air, and it will be
found that the two glasses will stick
together very tightly, so that the up
per can lift the lower. Indeed, it will
require considerable force to sepa
rate the glasses thus Joined. This is
due to the fact that some Of the air
inside, heated by the candle, has risen
out of the glass, 50 that the pressure
outside is greater than that within
thus making the glasses adhere firm
ly.
Experiment "A simple air pump
can be made by using a large glass
jar or bottle Close the mouth of this.
with tight rubber stopper. Through
this pass piece ct glcss tubing, to
the upper end OF which fasten a piece
of rubber: tubing about, two inches
1oIg, making a continuous Connection
to the inside Of the jar from without
Exhaust the air from your lungs, up
ply your mouth to the end of the rub
ber tube, and draw in with youl
breath, taking the air from the jar
Pinch the tube closely with your f1ng
ers, to prevent the air from re-enter
ing the jar. and repeat this process,
until you have exhausted the air from
tho jar. II the air is to be kept out
of the jar for any length of time tie
stout piece Of fine cord tightly
around the tube, or If possible faster
a p1nchcock to the tube, so that the
air may be released or retained a,
will.
Experiment 3-Put into this jar
small, wide-mouth bottle, such as
vaseline bottle, with a piece Of thtr
rubber cloth tied over the top. Uror
exhausting the air this cloth vii!
bulge up like balloon. This IL
caused by the air trying to get out o.
the bottle, owing to the tightening o!
the pressure above It when the all
in the jar has been removed.
Experiment 4-Instead of exhaust
ing the air, condense it by forcing the
air into the jar, pinching the rubbo.
tube between breaths, as before. The
rubber cloth on the small bottle will
then bulge inward, owing to the ir:
creased pressure above it.
Experiment 5-Replace the short
glass tube with longer one. Exhaust
the air. as before. Then, with the
rubber tube closed, hold the jar up
side down and put the end Of the tubs
in glass Of water. On releasing the
air in the jar, through the tube, the
water will squirt up through the tube
into the bottle, making a little foun.
tain. This Is because the pressure
of the air on the surface of the water
in the bowl forces it up into tho Jar.
where the pressure is less.