I *have* seen man hole covers that *were* in the shape of other curves of consta... | Hacker News

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		joe_the_user on April 20, 2009 \| parent \| context \| favorite \| on: Round manhole covers, or if Feynman applied for a ... I have seen man hole covers that were in the shape of other curves of constant width!! as in the rotary engine shape he describes. Reminds me of the convex solids class I took at UCLA years ago. Boy, I always wanted to say that! If only I could pull one of those interviews.

Luc on April 20, 2009 [–]

Where did you see those manhole covers? Its seems a bit over-the-top to manufacture a manhole cover in a weird shape when round or rectangular will do.

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