>I've used the ripple in the pond illustration frequently as well, but it >really isn't an accurate one, though if the pond is small enough it can be >quite illustrative. Yea, I know. That's why I fell back and regrouped around the blanket on the clothesline as a closer starting analogy. Add stiffness, glue it down around the perimeter, and it becomes something considerably more like a soundboard than a pond. Ron N
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