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STEP 11
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F
it the Burke tube over the plywood disk.
You may need to do some sanding or even additional cutting to make sure
it fits properly.
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STEP 12
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M
ark the Burke tube where the electrical
cord will enter the Burke tube, about 1" above the bottom of the Burke
tube (the windows are on the bottom). Drill a hole with a 3/8" bit.
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©2013 The Exploratorium, Pier 15, San
Francisco, CA 94111
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