Dull Needle Illustration
The pictures above show the same needle at increasing levels of magnification. As you can see, this needle appears sharp, even under low magnification, let alone the naked eye. However, this needle could cause all kinds of trouble.
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Pictures compliments of Nestor Zaluzec from MicroScape at
Pictures compliments of Nestor Zaluzec from MicroScape at http://www.microscopy.com/MicroScape/MicroScape.html
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