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Pastimes : Don't Ask Rambi
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To: Gauguin who wrote (51737)6/3/2000 9:28:00 PM
From: Jacques Chitte  Read Replies (1) of 71178
 
Trigonometry works in our favor. A circle has an infinitesimal contact with a straight line. But a teeny deflection from circularity yields a huge increase in contact area. It's the horizon effect - raise your head six feet above the round earth, and the amount of land you see expands to many miles in each direction.
So the steel crunches elastically for a few thousandths of an inch and makes contact with the rail along a good-sized patch, which is yielding a few thousandths of its own in a reversible, springy dimple.

...I'd say more but somebody needs the phone.
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