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P r e p a r i n g T h e
M o d e l
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Prior to
attending the demonstration, the visiting engineer should make the
following preparations (Figure 6):
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(1) |
Cut
the bottom off the water bottle. |
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(2)
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Remove the straw and
cut a hole, approximately 1/2-inch square, next to the edge of
the cap. |
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(3) |
Use four strips of
tape to mount the whistle over the drinking straw hole. |
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(4) |
Make a one-way "flap
valve" by folding a strip of tape back on itself such that only
1/4 to 3/8 -inch of adhesive surface is exposed, and tape this
adhesive surface to the underside of the bottle cap, right next
to the edge of the cap. |
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(5) |
If possible, test the
model in a sink or bucket of water at home, to make sure that
there isn’t excessive "blow—by" around the edges of the flap
valve or base of the whistle. |
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(6) |
Once satisfied that
the flap valve is working properly, stick the last strip of tape
to the top of the cap, over the flap valve window. This will
conceal it from the students and prevent the flap valve from
functioning during the first part of the demonstration. |
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(7)
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Be sure to let the
teacher know that you’ll want to work with teams of 4-5 students
at a time (small enough to gather around the bucket or sink and
still see what’s going on). Also verify that a water supply will
be handy—you may have to fill the bucket ahead of time. |
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To go onto the 4th of 5 pages click on
::
The Demonstration
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