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Equipment:
Cut the carton so as to make a
small horizontal slit near the top; insert the paper clip.
(Fig.1) Cut a vertical slit near the bottom. Then cut horizontal
slits perpendicular to this cut at its end points - like an H on
its side. (Fig.1)
Pry out the flaps thus made and bend them to an upright position.
Insert the needle through these flaps. (Fig.2)
Tie the hair to the paper clip, wind it around the needle, tape
the penny to the other end of the hair, and let the penny hang
over the end of the box, which should be lying on its side.
Put a card with a scale on the side of the carton under the straw
which has been pushed through the eye of the needle. (Fig.3)
Place the hygrometer on a wet towel in a dishpan and cover with a
damp cloth. After 15 minutes remove it from the cloth and set the
straw at numeral 10 on the scale. Watch to see whether the straw
moves.
Since humid air causes the hair to stretch and dry air causes it
to shrink, the straw should move toward the dry end of the scale
as the hair dries.
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From Raytheon Aviation Educational Materials |
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Updated: March 12, 2004