STEP 4
N
ext, mark the two spots for the brass
holders, will keep the cutouts/masks in place over the windows. Draw the
outlines for the windows and the two spots for the brass holders. These
spots should be placed in the center of the each of side slits.
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The picture shows how the outline should look. Repeat this
step four times around the Burke tube. Make sure that the windows are an
equal distance from each other.
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©2013 The Exploratorium, Pier 15, San
Francisco, CA 94111
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